Why GetWindowText returns empty string

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  - 1
    - shellexecuteex in windows service, to run the app persistently I created a service which uses shellexecuteex and WaitForSingleObject to open an application. my requirement is to keep the app running until the service is stopped, even if the user terminates the app from task manager. here is my code but it doesn't restart the app when it is closed. any help is appreciated, thanks restart: ShExecInfo.cbSize = sizeof(SHELLEXECUTEINFO); ShExecInfo.fMask = SEE_MASK_NOCLOSEPROCESS; ShExecInfo.hwnd = NULL; ShExecInfo.lpVerb = NULL; ShExecInfo.lpFile = szPath; ShExecInfo.lpParameters = ""; //"service"; ShExecInfo.lpDirectory = NULL; ShExecInfo.nShow = SW_SHOW; ShExecInfo.hInstApp = NULL; ShellExecuteEx(&ShExecInfo); WaitForSingleObject(ShExecInfo.hProcess,INFINITE); CloseHandle(ShExecInfo.hProcess); goto restart; Tag: Why GetWindowText returns empty string Tag: 266795
  - 2
    - Shell dll can't be in Unicode? I downloaded a Microsoft sample of Desk band (adding custom band to the taskbar) here : http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/samples/internet/components/bandobjs/default.asp It was compled and run good when I compiled with "Use Multibyte-character set". But when I compiled it with "Unicode", this caused error. <code> STDMETHODIMP CDeskBand::GetCommandString( UINT idCommand, UINT uFlags, LPUINT lpReserved, LPSTR lpszName, UINT uMaxNameLen) { .... case IDM_COMMAND: lstrcpy(lpszName, TEXT("Desk Band command help text")); ...... </code> Error 6 error C2664: 'lstrcpyW' : cannot convert parameter 1 from 'LPSTR' to 'LPWSTR' I couldn't fix it and it didn't seem to be critical code to run the application, so I commented it out like //lstrcpy(lpszName, TEXT("Desk Band command help text")); Then it was compiled. I ran it but it didn't work. First of all, the menu texts were truncated. The "Desk &Band Command" -> "Desk &B", "Sample &Tool Band" -> "Sample &T" and so on. And the bands didn't appear. All I changed were "Use Unicode" and commented out 3 string errors. Should shell dll be in multibyte? If you have Visual C++ please download the sample and compile it with Unicode. And teach me what is wrong please. Thanks. PS: I used Visual Studio .NET 2005 under Windows XP. Tag: Why GetWindowText returns empty string Tag: 266792
  - 3
    - C4267 with std::deque<size_t> Dear all, we have encountered a very strange warning in a very specific contex: using a std::deque with size_t on VStudio 2003, warning level 4 and an exported bool vector, i.e.: //1.cpp #include <deque> #define CLASS_EXPORT __declspec(dllexport) //for explicit (DLL) instantiation of vector's: #pragma warning(push) #pragma warning(disable: 4251) //warning C4251: ... needs to have dll-interface to be used by clients, (TODO: can be dangerous however) #include <vector> #pragma warning(pop) //explicit (DLL) instantiation template class CLASS_EXPORT std::vector<bool>; int main() { //std::deque<unsigned> tmp1; std::deque<size_t> tmp; tmp.resize(3); return 0; } A compiler bug I presume? wkr, me Tag: Why GetWindowText returns empty string Tag: 266786
  - 4
    - Minimize and mazimize dialog Hi, I have a basic question in MFC Dialogs. Is it possible to minimize the dialog and perform some operations and restore the dialog again? For Example: this->ShowWindow(SW_HIDE); //capture the screen this->ShowWindow(SW_SHOW); Is it possible to do the above thing? I am new to MFC development. The dialog gets closed, when i executed the above lines of code. Please let me know how to perform this functionality. Thanks... Tag: Why GetWindowText returns empty string Tag: 266783
  - 5
    - MDI forms and Dlls (visual C++ 2005) I will loose it very soon! I have one mdi parent and two mdi childs, the parent and the childs are in different dlls ( = three dlls) I can load the childs and view them from the parent and even manage them from there, BUT I can't get the child to communicate with eachother! What I need is e.g. childA to react on an event and send informaton to childB. Can anyone, please, post a link to a tutorial on this matter, I would be most grateful! Tag: Why GetWindowText returns empty string Tag: 266778
  - 6
    - How can I compile this code? Dear ladies and gentlemen, I am interesting in Computer Graphics programming with VC. I found a piece of code segment in a book, the code is in the following: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CDC *pDC = GetDC(); if (! pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) { AfxMessageBox("Current system doesn't support Palette."); return; } CString str; int nColorNum = pDC->GetDeviceCaps(SIZEPALETTE); str.Format("Current system palette could simultaneously display a number of colors is %d.", nColorNum); AfxMessageBox(str); int nColorReserved = pDC->GetDeviceCaps(NUMRESERVED); str.Format("The reserved color count of the current system palette is %d.", nColorReserved); AfxMessageBox(str); ReleaseDC(pDC); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I created a MFC project with VC in the Visual Studio .NET 2003 . When I compile this code above, the compiler gives me the following error code: error C2660: ¡°GetDC¡± : Function doesn't accept 0 parameters. How can I compile this code successfully? Help me, please. By the way, where can I find a newsgroup specialized for the Computer Graphics Development with VC++ .NET? Thank you very much. Best regards. Xiaoming Tag: Why GetWindowText returns empty string Tag: 266766
  - 7
    - automatically rename Is there any way to rename a variable in VC++ so it gets automatically renamed throughout the code? Tag: Why GetWindowText returns empty string Tag: 266760
  - 8
    - AfxBeginThread Is there any automatic way to have AfxBeginThread or some other thread creation function call a class's member function directly? I don't see how the "this" pointer would get there. Tag: Why GetWindowText returns empty string Tag: 266747
  - 9
    - A matter of style? Hi All, I have seen if tests written both of the ways shown below. Is this just considered a matter of personal style or do you feel there's some inherent advantage of doing it one way or the other? I typically do it the second way. if ( 0 == MyFunc( stuff) ) { } if ( MyFunc( stuff ) == 0 ) { } - Arnie Tag: Why GetWindowText returns empty string Tag: 266742
  - 10
    - WinForms and header filers Hi, I recently posted this question in another group, but this group I believe is a better choice for this topic: I am working on my very first project in Visual C++ 2005 and had just created my very first form (Windows Form) , added a button, a meny and other stuff a regular project contains. But then it struck me that when adding events and such (in this case events) it created a definition for the method (event handler) in the header file that was created when I created the form. So the event code was both the declaration and the definition! As a C++ programmer, that turned my stomach inside out! What I do want is the declaration in the headerfile and the definition (the logic) in a separate source file. The project is very large (! , and a rewrite from another development platform) and a good structure is critical for the success of the project. So, how to *automaticlly*, when adding a new event, put the declaration in the header file (that is connected to the form) and the definition in a separate source file (.cpp) Any answer or link to a resource is welcome! (hope you understand what I am after) Tag: Why GetWindowText returns empty string Tag: 266727
  - 11
    - serialiazation, carchive issue with vc8 and vc6 Hi all I've recently exported one of our tools to VC8, after some minor changes it compiles and appears to work ok, it can open and close files which it has created etc. The vc8 migrated app exports a file using carchive which again appears to be workign fine except when it is to be read using an application compiled using vc6. Are there any known problems when reading vc8 serialized files with a vc6 product. Note that migrating the vc6 project to vc8 is currently not an option Tag: Why GetWindowText returns empty string Tag: 266726
  - 12
    - V2005 Syntax Highlighting (new words?) Hi, Does anyone know if it is possible to (and if so how) to add new words to the syntax highlighting list on Visual Studio 2005. Although not a keyword, I wish to make the symbol 'Ascii' highlighted to make it stand out from the rest of the code and improve readability. -- - Mark Randall http://www.temporal-solutions.co.uk http://www.awportals.com Tag: Why GetWindowText returns empty string Tag: 266719
  - 13
    - When to free BSTR after casting to CString (client or COM server) Hey All, I am wondering when I should free a BSTR that is past to a COM component and cast to a CString for internal use. Specifically, say I've declared a function like this in my COM component: HRESULT Test([in] BSTR arg); The client has to give my Test function a valid BSTR object. Perhaps that looks something like this: BSTR s; s = SysAllocString(L"Hello"); Test(s); SysFreeString(s); // Should I free this here... Then, say my Test function is implemented like this: HRESULT Test(BSTR arg) { CString s(arg, SysStringLen(arg)); SysFreeString(arg); // or should it be freed here? // Do stuff w/ the CString s. return S_OK; } As you can see, I'm a little confused as to where the BSTR should be freed, in the client or server. I am guessing it should be freed in the client, but I wanted to get a second opinion on that. TIA! -- Regards, Travis Spencer Tag: Why GetWindowText returns empty string Tag: 266718
  - 14
    - Linking error Error return code-'0x458' I tried to compile VC4.0 application in VC++8.0 version. here some of the linked to create DLL files. Those libraries were compiled in 32 bit architecture. The *.obj of the *.cpp files are generated properly, While linking those obj with existing lib(32bit architecture) I am getting the folllowing error. --------------------------------------------------------------------- Microsoft (R) Program Maintenance Utility Version 8.00.50727.42 Copyright (C) Microsoft Corporation. All rights reserved. link.exe @C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\1\nm138.tmp CommonDLL.obj : fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'X86' NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 8\VC\bin\amd64\link.exe"' : return code '0x458' Stop. -------------------------------------------------------------------------------------------- my question is.. Whether can we link 32-bit library in 64-bit production environment? does it work? I am waiting for any one reply. Tag: Why GetWindowText returns empty string Tag: 266714
  - 15
    - Speed problem Hi, I have a small problem here. I put in a paper today, which was basically a programming project for a sudoku solver. I got the programm working without a problem, but somehow the algorithm isn't running as fast as I thought it would. I talked to some of my colleagues and they basically told me that their algorithms were mostly not more complex than mine. Mostly even more simply, yet their programs solved a certain set of 100 sudokus in under 2 minutes, where mine needed 15 minutes. I activated all optimization options, used /O2 in Visual C++ but that only gave me like 2 seconds less computing time. I went throught the algorithm over and over and I am sure that it does work correctly, I put it on 20000 different sudokus in a file I found and it solved them all in a time of about 1.6 seconds per sudoku, which is simply not fast enough. Problem is I don't have any idea why it is so slow, while other programs which do basically do exactly the same are doing it so much faster. Don't missunderstand me, I don't want to get you to help me get more points, I put the project in already anyway. It's just that I will only get a score for the project, but no explanation on why it was so slow and since I am simply curious on what I did wrong I would appreciate if anyone her could give me a hint or two. I will upload the code under the following link so I don't have to put it in here, since even just writing the functions which actually do compute the algorithm would still be too much for a post here. I don't want to short it down though, since I want to show you the actual code as is so you can find anything that might be slowing it down too much. I know looking through all that code is a little work, but I would really appreciate any help. Again, my problem is not correctness or how to do it, but how to do it faster, a lot faster. Thanks in advance... here's the link: http://www.wcrevival.de/joker/CSudokuRiddle_cpp.txt Tag: Why GetWindowText returns empty string Tag: 266713
  - 16
    - warning C4013: 'GetComputerNameEx' undefined Hello, I have a simple C program that invokes GetComputerNameEx() with '(COMPUTER_NAME_FORMAT)ComputerNameDnsFullyQualified' value as first parameter. During compilation (via cl.exe command line or as part of VC 2003 project), I consistently get compile error (see "subject line" above). That is happening despite the following definitions on my WinXP system: #ifdef WINVER #undef WINVER #endif #define APPVER 5.0 #define WINVER 0x0501 #define _WIN32_WINNT WINVER #ifndef NTDDI_VERSION #define NTDDI_VERSION NTDDI_WINXPSP2 #endif How can I compile a program that tries to use GetComputerNameEx()?!? Tag: Why GetWindowText returns empty string Tag: 266708
  - 17
    - CryptoAPI problem -> decrypt possible with wrong key? Hi I wrote a little program that shows my problem. What I want to do is 0) generate a pair of RSA keys (private, public). 1) encrypt some text with the public key and 2) decrypt it with the private key... now, that works fine. But then I tryed something else... I tryed to use the public key for decrypting the data (which shouldn't work, as far as I know... but currently I'm a bit confused... anyway). So I expected an error when decrypting with the public key... but... it worked... can someone explain me this? thanks MR - Rudolf Meier Here's my code: CWinApp theApp; using namespace std; #include <wincrypt.h> #pragma comment(lib, "Crypt32.lib") #include <conio.h> int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) { int nRetCode = 0; // MFC initialisieren und drucken. Bei Fehlschlag Fehlermeldung aufrufen. if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0)) { // TODO: Den Fehlercode an Ihre Anforderungen anpassen. _tprintf(_T("Schwerwiegender Fehler bei der MFC-Initialisierung\n")); nRetCode = 1; } else { printf("[0] generate keys - [1] encrypt - [2] decrypt\n"); BOOL bResult; DWORD dwError; BYTE* pbBuffer = new BYTE[1024]; DWORD cbBuffer = 1024; HANDLE hFile = NULL; HCRYPTPROV hCryptProv; bResult = CryptAcquireContext(&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, 0); dwError = GetLastError(); if (!bResult) printf("error\n"); switch(getch()) { case '0': { HCRYPTKEY hKey; bResult = CryptGenKey(hCryptProv, CALG_RSA_KEYX, CRYPT_EXPORTABLE | AT_KEYEXCHANGE, &hKey); dwError = GetLastError(); cbBuffer = 1024; bResult = CryptExportKey(hKey, NULL, PRIVATEKEYBLOB, 0, pbBuffer, &cbBuffer); dwError = GetLastError(); hFile = CreateFile("C:\\private_key.dat", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); WriteFile(hFile, pbBuffer, cbBuffer, &cbBuffer, NULL); CloseHandle(hFile); cbBuffer = 1024; bResult = CryptExportKey(hKey, NULL, PUBLICKEYBLOB, 0, pbBuffer, &cbBuffer); dwError = GetLastError(); hFile = CreateFile("C:\\public_key.dat", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); WriteFile(hFile, pbBuffer, cbBuffer, &cbBuffer, NULL); CloseHandle(hFile); bResult = CryptDestroyKey(hKey); dwError = GetLastError(); } break; case '1': { hFile = CreateFile("C:\\public_key.dat", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); ReadFile(hFile, pbBuffer, 1024, &cbBuffer, NULL); CloseHandle(hFile); HCRYPTKEY hKey; bResult = CryptImportKey(hCryptProv, pbBuffer, cbBuffer, NULL, CRYPT_EXPORTABLE | AT_KEYEXCHANGE, &hKey); dwError = GetLastError(); strcpy((char *)pbBuffer, "testtext"); cbBuffer = strlen((char *)pbBuffer) + 1; bResult = CryptEncrypt(hKey, NULL, TRUE, 0, pbBuffer, &cbBuffer, 1024); hFile = CreateFile("C:\\encrypted_data.dat", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); WriteFile(hFile, pbBuffer, cbBuffer, &cbBuffer, NULL); CloseHandle(hFile); bResult = CryptDestroyKey(hKey); dwError = GetLastError(); } break; case '2': { hFile = CreateFile("C:\\public_key.dat", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); // should generate an error, because I'm loading the public_key to decrypt!! should not work!! ReadFile(hFile, pbBuffer, 1024, &cbBuffer, NULL); CloseHandle(hFile); HCRYPTKEY hKey; bResult = CryptImportKey(hCryptProv, pbBuffer, cbBuffer, NULL, CRYPT_EXPORTABLE | AT_KEYEXCHANGE, &hKey); dwError = GetLastError(); hFile = CreateFile("C:\\encrypted_data.dat", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); ReadFile(hFile, pbBuffer, 1024, &cbBuffer, NULL); CloseHandle(hFile); bResult = CryptDecrypt(hKey, NULL, TRUE, 0, pbBuffer, &cbBuffer); bResult = (strcmp((char *)pbBuffer, "testtext") == 0); printf("%s", (bResult ? "ok" : "error")); bResult = CryptDestroyKey(hKey); dwError = GetLastError(); } break; default: printf("wrong selection\n"); break; } bResult = CryptReleaseContext(hCryptProv, 0); dwError = GetLastError(); delete[] pbBuffer; printf("\nfinished\n"); getch(); } return nRetCode; } Tag: Why GetWindowText returns empty string Tag: 266706
  - 18
    - tcp socket hi, Can tcp socket be a one way communication. If i am only reading from server(receive( , , , )), do i still have to write to server (send ( , , , )) after each recieve call !!!! -thiru Tag: Why GetWindowText returns empty string Tag: 266702
  - 19
    - ToTitleCase I am converting some code to work in windows and I came across a function called ToTitleCase(). Is there a win32 equivalent to this? I found a ToUpper & ToLower but no ToTitle. Thanks Bob Tag: Why GetWindowText returns empty string Tag: 266699
  - 20
    - CXX0030: Error: expression cannot be evaluated when connecting to SQL server Hi all, I try to connect to a SQL database and get a 'CXX0030: Error: expression cannot be evaluated' due to the connection->Open function. The connection string was verified and therefore should work. I have no real idea where the problem is situated... I hope someone can help me out. Thanks in advance. Stijn try { m_hr = connection.CreateInstance(__uuidof(ADODB::Connection)); connection->CursorLocation = ADODB::adUseClient; connection->Open(L"Provider=SQLOLEDB.1;Integrated Security=SSPI;Initial Catalog=testing;Data Source=.",L"", L"", ADODB::adConnectUnspecified); } catch (_com_error &e) { e.Description(); } Tag: Why GetWindowText returns empty string Tag: 266698
  - 21
    - pixel decimation Hi all, How to do decimation. For example, I have a line of image pixel 2500. My screen resolution is 1280 by 1024. If i want the image to be displayed without a scroll bar in the bottom, How should i print the pixels on screen. any help would be great. Thanks, -thiru Tag: Why GetWindowText returns empty string Tag: 266694
  - 22
    - Creating a unique path separator Hi, If i have a tree structure, where the names can have ANY character in them, what would be the best method for finding a 'unique series of characters' to use as a separator when writing a path to an XML file? For instance, the structure could look like this: !"=A3$%^&*()_+1234567890- QWERTYUIOP{}qwertyuiop[] ASDFGHJKL:@~asdfghjkl;'# |ZXCVBNM<>?\zxcvbnm,./`=AC then im stuck for using a single character (lets pretend that all the extended characters have been used aswell - it could happen ... and probably will when i least want it to), so i have to use two characters for the separator. But of course, all the two character combinations could have been used up aswell in a gargantuan super path! So i would need to use three (or more - getting more and more unlikely, i know). All good suggestees will have a planet named after them, James. Tag: Why GetWindowText returns empty string Tag: 266688
  - 23
    - peculiar error, res.dll missing I have migrated one project from VC++ 6.0 to .NET2003(managed C++). I have modified the required code according to the .NET libraries. It is executing fine in both Debug mode as well as release mode.The name of the project is ardtd. The problem is while running the application(not from IDE). I put the exe and all the dlls required for that application. If i click on the exe file, it is supposed to execute fine but It says ardtdres.dll not found. I'm getting this error on the systems where .NET is not installed even though .NET framework is installed. If .NET is installed on the machine I'm not getting this error. Please let me know if you have any idea about this problem, Thank you in advance Tag: Why GetWindowText returns empty string Tag: 266685
  - 24
    - Newbie adding COM components to a project Hi, I am an experienced java and VB6 developer and had about 2 years experience of C++ about 8 years ago (but on UNIX). I have a COM object that I have used a lot in the VB6 environment by simply adding it to the references. I am then able to refer to the objects easily and intellisense works great. I am trying to write some code in C++ but I am having problems adding the COM object to the project. I do not know where to begin. I have access to the dll and to the tlb. Is there an easy way to do this? I am currently using Visual Studio 2005 Express but may be able to get my hands on the full VS 2005 environment. Any help really appreciated. Thanks David Tag: Why GetWindowText returns empty string Tag: 266684
  - 25
    - red exclamation mark icon Hi, Where I can find "red exclamation mark" icon, I was looking for this in few dll's but failed? m. Tag: Why GetWindowText returns empty string Tag: 266681
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  - 1
    - error LNK2022: metadata operation failed - using Templates? I've seen several previous posts related to LNK2022 errors using templates, but I have not seen a resolution (one other person said the error goes away if he does not make his class a template, but that's not a preferred solution for me, as it wasn't for him) . I have a template LinkedList class that I can use successfully within the .Net form.h file, but if I try to access it from within another class (only in that class, no longer in the form) it compiles fine but then I get two link errors: City.obj : error LNK2022: metadata operation failed (80131187) : Inconsistent method declarations in duplicated types (types: node; methods: .ctor): (0x06000003). City.obj : error LNK2022: metadata operation failed (801311D6) : Differing number of methods in duplicated types (node): (0x02000004). I've commented out most of the lines of code so I know that this error occurs when I include a method call from with the City object to the linked list method insertAtHead. The linkedlist class (reduced for this example) is: #pragma once template <typename Item> ref class LinkedList { private: ref class node { public: node() { data = Item(); link=nullptr; } node(const Item% init_data, node ^init_link) { data = init_data; link = init_link; } Item data; node ^link; }; public: typedef node ^NodePtr; LinkedList(void); void insertAtHead(const value_type% entry); private: NodePtr head; }; and in the cpp file: template <typename Item> LinkedList<Item>::LinkedList(void) { head = nullptr; } template <typename Item> void LinkedList<Item>::insertAtHead(const Item% entry) { head = gcnew node(entry, head); } In the City class, I have: #pragma once #include "LinkedList.cpp" ref class City { public: City(System::String^ cityName); void addDest(City^ dest); private: System::String^ name; LinkedList<City^> destList; }; and in the City.cpp file: void City::addDest(City^ dest) { destList.insertAtHead(dest); } If I comment out destList.insertAtHead(dest); I no longer get the linker errors. As stated above, the LinkedList files (unmodified) work if I put the declaration of the linked list and calls to insertAtHead in my Form1.h file. Why should it make a difference if they are in my City class instead? Any suggestions would be greatly appreciated! cyndi Tag: Why GetWindowText returns empty string Tag: 266678
  - 2
    - dllregisterserver not registering com classes I have a COM DLL (created with the ATL COM wizard). It comes with the function: // DllRegisterServer - Adds entries to the system registry STDAPI DllRegisterServer(void) { // registers object, typelib and all interfaces in typelib HRESULT hr = _AtlModule.DllRegisterServer(); return hr; } This function does get called when the object is registered, but none of the interfaces I have defined get registered. Do I need to put code in to manually register my objects? What does that function register, then? Thanks, -PaulH Tag: Why GetWindowText returns empty string Tag: 266671
  - 3
    - Making Type Library for normal Windows DLL (not a COM server) I read this artical and tried to create tlb for my C++ class. import "oaidl.idl"; import "ocidl.idl"; [ uuid(634FE8B5-C847-4b25-B135-B39312741EDE) ] library Vdll_1Lib { importlib("stdole2.tlb"); [ dllname("Vdll_1.dll") ] module Vdll_1Mod { //[entry(1)] void Calculate_1(void); [ entry("Calculate_1") ] void Calculate_1 (void); } }; ---------- LIBRARY "Vdll_1.dll" EXPORTS Calculate_1 ------ #import "C:\Test\Vdll_1\Debug\Vdll_1.tlb" I am getting linking problems . ClientClass.obj : error LNK2019: unresolved external symbol "void __stdcall Vdll_1Lib::Calculate_1(void)" (?Calculate_1@Vdll_1Lib@@YGXXZ) referenced in function "public: virtual long __stdcall CClientClass::Add(wchar_t *)" (?Add@CClientClass@@UAGJPA_W@Z) Debug\ClientVdll.dll : fatal error LNK1120: 1 unresolved externals. Any suggestions for this issue? thanks abhi Tag: Why GetWindowText returns empty string Tag: 266662
  - 4
    - VC++ vs. FoxPro I've generated a DLL with Visual FoxPro 9.0 and, on the other side, I've go a VC++ project wich uses DLL methods. I Copy the TLB file into VC++ project folder and the I rebuild EXE. If I create the DLL in VFP 6.0 it works ok, but if I do in VFP 9.0, when I build EXE, it says 'Function does not take <n> parameters'. I call DLL functions in this way: vResult = Iobj->mymethod(vparam, vparam, ...); Tag: Why GetWindowText returns empty string Tag: 266659
  - 5
    - Urge for help in a game programming Four Win Description To program the play named "four win", the background board should consist of a lattice with 7 columns, into which in each case 6 stones fit. The playing field stands perpendicularly, so that a stone falls always widen-possible downward. The rules are : 1=2E The goal of the Game is to place four stones in a row or column wise or diagonally as a first player. 2=2E Each player receives 21 stones of his colour (pink/green). 3=2E The green player begins. 4=2E The player lets a stone fall alternating into a row. 5=2E If no more places are in a row, then this may not be selected. 6=2E Winner will be the player, who can accommodate first four stones in a continuous manner (horizontally, vertically, diagonally). 7=2E If the backboard is full and there is no certain winner, then the play ends undecided. For a better understanding go to: http://www.kielack.de/games/fourwins.htm The program is to cover the following capability characteristics: =B7 Play between two human players. =B7 Play between a human and a computer player. =B7 Play between two computer players. =B7 Each player is to extend the abstract class ,,Player ", which is available on the practical course web pages for the Download. References =B7 One can make Screenshots simply by pressing the key at the same time ,,pressure/print screen "and/or <Alt> and ,,pressure/print screen "(the screen and/or the active window copies as diagram into the intermediate file, so that these can be inserted in Word over Edit->Past as picture directly). =B7 The aim for this program is to show as simple text edition as shown in the example TicTacToe (see C++ program simpleTicTacToe.cpp). =B7 In the simplest case the computer player can make coincidental courses (see C++ program zufallszahlen.cpp (RandomNumbers). A more intelligent strategy for the computer player can be programmed according to the mini max algorithm (e.g. see. http://de.wikipedia.org/wiki/ http://en.wikipedia.org/wiki/Minimax_algorithm). An improved variant for this algorithm is the alpha beta search (e.g. see http://en.wikipedia.org/wiki/Alpha-Beta). Tag: Why GetWindowText returns empty string Tag: 266656
  - 6
    - Packet split Hi all, I have a problem recieving data from a host machine. I m usiing socket programing. I formed a packet on host machine. When i run the application on the local machine (both server and client) I reiceve all data and packets. When i run the server on a remote machine i recieve less size data than expected once a while. I should recieve a packet size of 1118. sometime i recieve two packets with the size of 342 and 746. I dont figure it out why i recieve like this. Any help would be great. Thanks, thiru Tag: Why GetWindowText returns empty string Tag: 266654
  - 7
    - Linker Warning Hi !!! I am using Microsoft Visual C++ 8.0 compiler. I have precompiled headers file "precomp.h" and "precomp.cpp". When I compile I have always this warning "precomp.cpp: no public symbols found, archive members will be inaccessible". I know that by other empty files is it OK, but by precompiled headers file it is OK that I have empty source file. What should I do, if I want to switch off the warning? Thanks. Tag: Why GetWindowText returns empty string Tag: 266652
  - 8
    - PeekNamedPipe not working! I am using PeekNamedPipe on anonymous pipes. It always returns 0 in lpBytesRead, lpTotalBytesAvail and lpBytesLeftThisMessage even if data is written in pipe. I want to check if data is available to read, before making a ReadFile call, so that it does not blocks. Is there some other way? Tag: Why GetWindowText returns empty string Tag: 266644
  - 9
    - How can i run an .exe on vista which i have designed on win2k3 Hi, I have developed a VC++ program on win2k3 environment. When i am running it on Vista then it is giving an error. "Side by side configuration is not proper" What it means? Thanks inadvance for suggestion. --Durgesh Tag: Why GetWindowText returns empty string Tag: 266640
  - 10
    - non admin FlushFileBuffers for a volume Hi All, In our software we need to flush all the data on a removable device(disk on key). The problem is that when user is non admin we can't obtain handle to the volume using CreateFile cause of the insufficient privileges. I'm looking for a work around to cause file/cache manager to flush all the data. Btw eject is not an option for us as after flushing we are doing some operation via disk on keys firmware that cause it to show "private" folders, if we do this without flush the data is lost on Win2k machines where Performance check box is by default turned on on disk on keys. Thanks in advance Tag: Why GetWindowText returns empty string Tag: 266638
  - 11
    - Write text to, split, join, and page count tiffs Ok, this has been asked over and over again....but i have to ask because there has to be a better way (without spending $$). First things first, I'm running many (thousands of) tif images through an application I have been building. So far, i have used the Image.GetFrameCount to get page counts and write strings on images, split, and join using the graphics object. For anyone that has used either of these, it is incredibly slow especially compared to some of these 3rd party libraries that you can purchase for hundreds to thousands of dollars....seems kind of pointless to spend more than $10 on what i need to use them for. I have used FreeImage from SourceForge, and, compared to namely LeadTools, it is STILL slower for getting page counts and I cant even do any drawing using the library. What I am looking for is either a library or an example of how I can perform these actions with speed as a must. I am primarily a C# developer but can delve a little in C++. I am willing to do a little C++ code, so if that helps with a solution please dont let that be a limit. ANY help in any of these areas is much more appreciated than you can imagine. Thank you in advance! Tag: Why GetWindowText returns empty string Tag: 266635
  - 12
    - Question about hooking Hi, I'm trying to hook another application's window to check for WM_MOVE messages. Does anyone know of any examples (that arent for keyboard and mouse hooks)? I suppose i want to do the same as SPY++, just for fewer messages! Thankyou in expectation, James Tag: Why GetWindowText returns empty string Tag: 266628
  - 13
    - Convert TCHAR to integer! Hello, As I now know that const or not, either way the parameter is accepted in the _ttoi() function. On that note... Please consider the following code: =================================================== case WM_COMMAND: if ((LOWORD(wParam) >= extnl_INT_INPUT_MVars[0].CW2_CV_ID) && (LOWORD(wParam) <= extnl_INT_INPUT_MVars[3].CW2_CV_ID) ) //Fetch function! UpDateSimExtrnlInputs_INT(wParam, lParam, &io, HWND_CW2_extnl_INT_INPUT_CV); ...other code .... ================================================== ===============================UpDateSimExtrnlInputs_INT() void UpDateSimExtrnlInputs_INT(WPARAM wParam, LPARAM lParam, IO *io, HWND HWND_CW2_extnl_INT_INPUT_CV[]) { int k; //TCHAR szBufferINPUT[] = _T("12345"); Tried it ! Gives error! TCHAR szBufferINPUT[10]; //Declare 10 character array SendMessage( (HWND) lParam, WM_GETTEXT, 5, (LPARAM)szBufferINPUT ); //Get the text in the control //The next line should convert the string buffer to an integer k = _ttoi(szBufferINPUT); //This line gives the error! } ===================================================== Here is the error that I get: c:\_DTS_PROGRAMMING\C_PROGRAMMING\vc++\MY_APPS_LAB\XPPLC\WndProc_CW2.cpp(780): error C3861: '_ttoi': identifier not found, even with argument-dependent lookup I have re-posted this question, and the fellows that answered the previous post are very welcome to continue with it and I will more that willingly work on all your feedback. I find the previous post had too many topics and I was getting confused that's all! :) I don't disagree with you Brian, hence, yes, gosh, Yes we are in trouble! I know that the TEXT macro is defined in a few ways like as: #define _T(x) __T(x) and so that's where David got the following line: TCHAR szBufferINPUT[] = _T("12345"); But I get an error on this... c:\_DTS_PROGRAMMING\C_PROGRAMMING\vc++\MY_APPS_LAB\XPPLC\WndProc_CW2.cpp(768): error C3861: '_T': identifier not found, even with argument-dependent lookup But you see that SendMessage() will get different text from different controls. So: TCHAR szBufferINPUT[] = _T("12345"); can't be so. The buffer has to be filled in with a new values everytime. And I did try it if you look at the above code! Anyways I still would appreciate some help on this topic! Thankyou news groups! -- Best regards Robert -- Best regards Robert Tag: Why GetWindowText returns empty string Tag: 266627
  - 14
    - Convert TCHAR to const char? Hello, I have the following sendMessage that returns text and is stored in a string of TCHAR type. ============================================== TCHAR szBufferINPUT[10]; SendMessage( (HWND) lParam, WM_GETTEXT, 5, (LPARAM)szBufferINPUT ); ============================================== Now, I need to convert this text string to an integer type.... So I fugure to go with the atoi function! But the atoi takes in a const char! I looked in many books for explanations on conversions from TCHAR to const char.... ya right! Haven't found one! So I searched the WIndows help and came up with this: "Remarks These functions convert a character string to a double-precision, floating-point value (atof and _wtof), an integer value (atoi, _atoi64, _wtoi and _wtoi64), or a long integer value (atol and _wtol). " So I guess my choice would be atoi or _wtoi right? in either case I getthe following errors respectively: c:\_DTS_PROGRAMMING\C_PROGRAMMING\vc++\MY_APPS_LAB\XPPLC\WndProc_CW2.cpp(773): error C2664: '_wtoi' : cannot convert parameter 1 from 'TCHAR' to 'const wchar_t *' c:\_DTS_PROGRAMMING\C_PROGRAMMING\vc++\MY_APPS_LAB\XPPLC\WndProc_CW2.cpp(773): error C2664: 'atoi' : cannot convert parameter 1 from 'TCHAR' to 'const char *' Can anyone show me what I need to do for this to work along with a breif explaination so I can get one step closer to fully understand data types and their conversions! A little discouraged although axious to learn! All suggestions appreciated! -- Kind regards Robert Tag: Why GetWindowText returns empty string Tag: 266613
  - 15
    - Typelib info for IPersistFile interface ? Hi: I need my atl object to implement the IPersistFile interface. Any of you know where is the Typelib info (*.tlb,*.exe,*.dll,*.ocx,*.ocb file) for that interface? Upon OleView tool that interface is provided by ole32.dll, but that file doesn't have that kind of info embedded. Thanks in advance. Regards. Tag: Why GetWindowText returns empty string Tag: 266612
  - 16
    - Afx Out of curiosity, what does Afx stand for in MFC lingo? Thanks. Tag: Why GetWindowText returns empty string Tag: 266609
  - 17
    - Quick question! Hello, Say I have a break point on the following line of code: ============================================= static TCHAR szBufferINPUT[10]; for(i=0;i<4;i++) { HWND_CW2_extnl_INT_INPUT_CV[i] = CreateWindow( TEXT ("edit"), TEXT("zero"), WS_CHILD | WS_VISIBLE | WS_BORDER | ES_LEFT | ES_MULTILINE, extnl_INT_INPUT_MVars[i].ExtnlMVarLeft, extnl_INT_INPUT_MVars[i].ExtnlMVarTop, extnl_INT_INPUT_MVars[i].ExtnlMVarRight, extnl_INT_INPUT_MVars[i].ExtnlMVarBottom, hwnd,(HMENU)extnl_INT_INPUT_MVars[i].CW2_CV_ID, ((LPCREATESTRUCT) lParam)->hInstance,NULL); } =============================================== When the program execution stops at the line above and I view the locals variables watch, the value of the handle returned from the above statement at this point is 244842618. Obviously, I only look at the first control for now... so at, say when i = 0. So later in my code I click on the first edit control and I have another break point in the code handling for this control as done so in the following code: ================================================= case WM_COMMAND: if ((LOWORD(wParam) >= extnl_INT_INPUT_MVars[0].CW2_CV_ID) && (LOWORD(wParam) <= extnl_INT_INPUT_MVars[3].CW2_CV_ID) ) SendMessage( //***BREAKPOINT HERE*** (HWND) lParam, EM_GETLINE, 0, (LPARAM) szBufferINPUT ); ================================================= why is it that if I put a break point at SendMessage() line above, the value of lParam is not 244842618? It is 3212454 instead? Isn't lParam the child control's handle? Atleast this is what I read! Okay, okay... I actually read that it was the child Window handle! But isn't that the same thing? Why the different handle values? And the second part of my question is that I am trying to retreive the value from my edit control.... As you see as I create my edit controls I insert a default value of "zero" in them! Why is it that when I run the code above and when I put my cursor over the szBufferINPUT in the following line of code I get "". Means it is reading nothing when I expected a "zero" to be read? SendMessage( (HWND) lParam, EM_GETLINE, 0, (LPARAM) szBufferINPUT ); =================================================== [2nd Part of my question] Also, I have gone through this 6 months ago with some sympathetic news groups fellows and it still gets the best of me because everytime I see this I sort of generate a fear of it. But now that it is facing me one more time, I shall persue more knowledge on it! ***DATA TYPES!*** Okay, lest try this again! If I may politely ask you to be patient, god knows you all have! :) ***All the edit controls I have created can hold up to 4 characters max! The help files for the EM_GETLINE message says: "lParam Pointer to the buffer that receives a copy of the line. Before sending the message, set the first word of this buffer to the size, in TCHARs, of the buffer. For ANSI text, this is the number of bytes; for Unicode text, this is the number of characters. The size in the first word is overwritten by the copied line." But when we look at the prototype of this function it says that lParam should take a (LPARAM) or a (LPCTSTR) type right? But LPCTSTR has been defined as so in the WINNT.H of the Windows files: =============================================== typedef CONST WCHAR * LPCWCH, * PCWCH, * LPCWSTR, * PCWSTR and then: #ifdef UNICODE ....other type def's... typedef LPCWSTR LPCTSTR =============================================== So if I declare my string buffer in TCHARs as stipulated above! static TCHAR szBufferINPUT[10]; //Space for 10 characters! then how does the prototype parameter accept a TCHAR when it should accept a LPCTSTR? Because as typedefed above, if LPCTSTR is defined as a LPCWSTR type and further LPCWSTR is defined as a CONST WCHAR type so then, how is does the CONST WCHAR type defined as a TCHAR type, which is what we need right? Could this have something to do why I read "" instead of "zero" in the 1st part of my question? Sorry for the lenghty post! All help appreciated..... P.S. Sorry for the numerous postings, this month its like almost every line I try, turns up to be a many hours snag! -- Best regards Roberto Tag: Why GetWindowText returns empty string Tag: 266605
  - 18
    - thread Is there any way to create a thread that does not begin by calling a function? I would basically like a thread that starts executing at the current point in the program. This would be similar to calling the Unix fork() function but for threads. It would help make my code much cleaner. Thank you. Tag: Why GetWindowText returns empty string Tag: 266604
  - 19
    - CBitmap - Load JPG Hi there, I'm using the CBitmap class to load images from file. At current I am having to use the LoadImage method of User32.dll to load my images but unfortunately it does not seem to support the loading of any other image than BMP. I was just wondering what the normal procedure for loading JPEG's, GIFS etc into a CBitmap object usuall is? Nick. Tag: Why GetWindowText returns empty string Tag: 266599
  - 20
    - importing messages from outlook express how we can import picture messages from outlook express using dbxMessage in vc++? Tag: Why GetWindowText returns empty string Tag: 266595
  - 21
    - What the....! is going on! Hello, This one I just had to post! It must be me again.... but I must know why! Check this out: ==================================== case WM_COMMAND: //IF EXIT BUTTON CLICKED THEN EXIT APPLICATION if (LOWORD(wParam) == WindowButtonsCW2[0].MW_btC_ID) DestroyWindow(hwnd); //End application //UPDATE SIMULATED BOOLEAN INPUTS else if ((LOWORD(wParam) >= ChkBoxes[0].MW_btC_ID) || (LOWORD(wParam) <= ChkBoxes[3].MW_btC_ID) ) UpdatingSimInputs_BOOL(lParam,&io); //UPDATE SIMULATED INTEGER INPUTS else if (LOWORD(wParam) == 150) UpDateSimExtrnlInputs_INT(); //***IT NEVER COMES HERE!!!*** return 0; ================================================== It never goes to the following line??????????????????????????? UpDateSimExtrnlInputs_INT(); The value of wParam is 16777366, which the LOWORD of this is 150! I tried it with brackets and no brakets after the if's and else if's, and same problem! If I remove all (else if's) then it works, like this: ============================================= case WM_COMMAND: //UPDATE SIMULATED INTEGER INPUTS if (LOWORD(wParam) == 150) UpDateSimExtrnlInputs_INT(); //***NOW IT COMES HERE!!!*** return 0; =============================================== This ought to be a good one, I tell ya! :-) Allfeedback welcome ! Thanks! -- Best regards Robert Tag: Why GetWindowText returns empty string Tag: 266586
  - 22
    - const std::map reference and __declspec property Inside my class, I'm maintaining a private map like this: std::map< unsigned long, AuthorizedDatabase > m_authorizedDatabases; The idea is to expose this as a property and be able to reference individual elements using a syntax like this: AuthorizedDatabase db = x.AuthorizedDatabases[0x09000112]; Currently, I had a failed attempt at this using a property and an accessor method: const std::map< unsigned long, AuthorizedDatabase >& GetAuthorizedDatabases() const; __declspec( property( get=GetAuthorizedDatabases ) ) const std::map< unsigned long, AuthorizedDatabase >& AuthorizedDatabases; This obviously won't work because I'm returning a const map reference and the operator[] is non-const because it can modify the map. I'd rather not return a non-const reference that could be modified, and I'd also like to avoid returning a complete copy of the map. Is there any container class better suited to this that has an operator[] that can be used on a const version of the object? Alternatively, is there a better way to go about accomplishing this? Thanks, -Matthew Tag: Why GetWindowText returns empty string Tag: 266584
  - 23
    - using tryparse Hello everyone, I've got a little problem, I'm programming in visual c++ and I try to get back some numbers from a form using tryparse. It works perfectly on my computer because the configuration is an english one. But on a french configuration where the dot of floats is a comma it doesn't work. I mean it works with a comma but I would like to stay in an english configuration with the dot. Thanks for your help -- ryo Tag: Why GetWindowText returns empty string Tag: 266578
  - 24
    - customize setting for \t escape sequence Hello, I am using MSVC C++ .NET. I am trying to write a simple console program using cout to display text to the console window. When I try to use the \t escape sequence, it gives me 3 spaces. I would like it to give me 4 spaces. How do I change this? Step by Step wallthrough or a link to a step by step "dummy" proof walk through would be GREAT! Thank you, -- Geoff glhart\\@\\hotmail.\\com Tag: Why GetWindowText returns empty string Tag: 266575
  - 25
    - "edit" control is read only? Hello, I am using the edit class as I am creating a control as so: ============================================== static HWND HWND1; LRESULT xxx; HWND1 = CreateWindow( TEXT ("edit"), TEXT("zero"), WS_CHILD | WS_VISIBLE | WS_BORDER | ES_LEFT | ES_MULTILINE, 10,10,50,30, hwnd,(HMENU)800, (HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL); //Set the control as non read only! xxx = SendMessage( (HWND) HWND1, // handle to destination control (UINT) EM_SETREADONLY, // message ID (WPARAM) false, // = (WPARAM) () wParam; (LPARAM) 0); // = 0; not used, must be zero ); =================================================== Can anyone tell me why the edit control created with CreateWindow appears as read only. I don't see a flashing cursor in the control, nor can I type text in it! I know the above code is not much for you fellows to work with, however before I spend 4 hours reducing my project to a few compilable lines, If I may politely ask! I was just wondering if someone had this problem already where its solution would be an obvious and simplistic one! If not well, just let me know and its no problem, I will crunch it down to more of an analysable and compilable size! Also, xxx reurns a 1, apparently if the function fails, it should return a 0. So I guess my control is not set as read only! But why is it still read only? My code is 99% the same as the POPPAD1.C from M. Petzold's hand book! P.396. The only difference is that as a whole, my application is much larger and I am doing this on a child window where as he is doing it on the main wndProc window. I don't think this should make a difference.... But I could be wrong! All feedback for this is appreciated. Wish you all a nice day! :) -- Best regards Robert Tag: Why GetWindowText returns empty string Tag: 266560

Hi Experts:

I have a small console application which tries to read out the content of
the "Address" edit field in an IE browser window.

I can get the window handle of the "Address" edit control but the
GetWindowText returns empty string and GetLasterror returns 203; under error
Lookup, the error means "The system could not find the environment option
that was entered". No idea what it means.

The window handle of the "Address" edit should be correct since it is the
same as the one shown by the Spy++ program. I can also get the control's
class name correctly.

The Spy program shows the content of the Address edit correctly. I just
wonder what I'm missing here?

Thanks In Advance!
Polaris

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Re: Why GetWindowText returns empty string by Igor

Igor
Fri Jul 21 15:25:35 CDT 2006

Polaris <etpolaris@hotmail.com> wrote:
> I have a small console application which tries to read out the
> content of the "Address" edit field in an IE browser window.

From GetWindowText docs: "GetWindowText cannot retrieve the text of a
control in another application".

Send WM_GETTEXT message to the control instead.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925

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Re: Why GetWindowText returns empty string by Polaris

Polaris
Fri Jul 21 17:20:49 CDT 2006

Thanks! It works.

Polaris

"Igor Tandetnik" <itandetnik@mvps.org> wrote in message
news:e88qTPQrGHA.3564@TK2MSFTNGP03.phx.gbl...
> Polaris <etpolaris@hotmail.com> wrote:
>> I have a small console application which tries to read out the
>> content of the "Address" edit field in an IE browser window.
>
> From GetWindowText docs: "GetWindowText cannot retrieve the text of a
> control in another application".
>
> Send WM_GETTEXT message to the control instead.
> --
> With best wishes,
> Igor Tandetnik
>
> With sufficient thrust, pigs fly just fine. However, this is not
> necessarily a good idea. It is hard to be sure where they are going to
> land, and it could be dangerous sitting under them as they fly
> overhead. -- RFC 1925
>
>

Top