How to ? out argument in managed c++

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  - 1
    - Enter / Leave Critical Section in different threads First, I thought that it was wrong to enter a critical section from one thread and then leave the same critical section from another thread. I wrote a small program and it indicates that there is no error to do so: #include <windows.h> #include <process.h> #include <stdio.h> struct threadparameter { CRITICAL_SECTION *criticalsection; int threadid; }; // enter / leave critical section in different threads void testcriticalsection(void *params){ threadparameter *parameter = (threadparameter*)params; int threadid = parameter->threadid; switch (threadid) { case 0: EnterCriticalSection(parameter->criticalsection); printf("thread %d entered critical section, error code: %d\n", threadid,GetLastError()); Sleep(9000); break; case 1: LeaveCriticalSection(parameter->criticalsection); printf("thread %d left critical section, error code: %d\n", threadid,GetLastError()); Sleep(5000); break; case 2: printf("thread %d enter critical section\n", threadid); EnterCriticalSection(parameter->criticalsection); printf("thread %d entered critical section, error code: %d\n", threadid,GetLastError()); break; } printf("thread %d is done\n", threadid); } int main() { CRITICAL_SECTION criticalsection; InitializeCriticalSection(&criticalsection); printf("testing different thread enter / leave critical section\n"); const int threadcount = 3; threadparameter param[threadcount]; HANDLE th[threadcount]; for (int i = 0; i<threadcount; ++i) { param[i].threadid = i; param[i].criticalsection=&criticalsection; th[i] = (HANDLE)_beginthread(testcriticalsection,0, &param[i]); } Sleep(1000); WaitForMultipleObjects(2, th, TRUE, INFINITE); DeleteCriticalSection(&criticalsection); printf("main exits\n"); return 0; } The first thread call EnterCriticalSection, the second calls Leave and third calls Enter again. If the Leave call in the second thread has no effect (since it doesn't own it), the third thread should be blocked. But it was NOT. If the second thread doesn't call Leave, the third thread IS blocked which is as expected. To prevent critical section become undefined (when its owner thread dies), I put some sleep call in the code (certainly, real application should not use or minimize Sleep). Why a thread doesn't own a critical section could release the lock? Is there something wrong in the code so this is not a valid test? Another issue illustrated in the code is WaitForMultipleObject. The first parameter is the number of objects in handle array. in the above example, the object count should be 3. However, if I put it 3 over there, the call always returns as soon as ONE thread is done. So, my second question is why WaitForMultipleObject doesn't wait for all objects to signal? It is quite possible that the small program has a fundamental fault and hence, above issues are just my fault. In that case, I am eagerly waiting for someone to point it out. Thanks. J Tag: How to ? out argument in managed c++ Tag: 278186
  - 2
    - deploying dll's using depends.exe to assess <needed> modules hi everyone, i got lost in a thread, which actually stopped. so i would like to rephrase some questions, which weren't really answered, about deploying dll's analyzed by dependancy walker: 1. what happens if you deploy (using setup pro) a dll that's already present on the target systm? 2. do you need to deploy 'delay load' (according to dep walker) linked modules? i suppose it's: 'yes'! 3. how do i distinguish (in dep walker) between always present system modules, and modules i need to deploy myself? marco Tag: How to ? out argument in managed c++ Tag: 278185
  - 3
    - LNK2019 problem My C program compiles, but I get LNK2019-errors during linking. The cause is some symbols that are defined in some C-files that are not in my project. In VS6, these files ended up under "External dependencies", and everything went smoothly. I am now using VS7. How do I tell "the system" that it needs to also compile (and link) these files, without taking them into my project (which I don't want to do, since it is a lot of files, which I didn't make)? I'm probably using the wrong terms, but hopefully you understand what I am asking. TIA, Lars Tag: How to ? out argument in managed c++ Tag: 278182
  - 4
    - Setting up 3D Array I would like to change the following static array to be dynamically created. Does someone have some sample code to show how to create a three dimensional array of doubles? double dArrValues[2][9][24]; TIA, Tom Tag: How to ? out argument in managed c++ Tag: 278171
  - 5
    - time conversion function ? I have a variable time in the number of days such as 1 to 366 and I was wondering if there is a simple function that will convert it to the month and day of the month. I can do it myself, but I was just wondering if there is an easy builtin function that I could use. I am using Visual C++. Normally, I use strftime as it is very useful and has many options, but I did not see a way to convert the days of the year to month and day. Z.K. Tag: How to ? out argument in managed c++ Tag: 278157
  - 6
    - OpenPrinter in Administrative mode in network in remote PC in VC++ Hi I have a small problem in my application. How to open printer in administrative mode in VC++ particulerly. Do i need to do ant changes in Printer settings in Remote PC...? Thanks Tag: How to ? out argument in managed c++ Tag: 278150
  - 7
    - VC++ security problem using WMI Hi, I found some code from codeproject site using WMI in VC++. I have created a method having the following code in it. It works fine when I am running into "Admin" accound in Windows XP Pro while in "Restricted user account", its not able to run. It's giving error messsage "Could not enumerate" so it seems "pEnumObject" seems null or empty. Please help, Thanks in advance, Code: CoInitialize(NULL); //Security needs to be initialized in XP first and this was the major problem //why it was not working in XP. if(CoInitializeSecurity( NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, 0 ) != S_OK) return; IWbemLocator * pIWbemLocator = NULL; IWbemServices * pWbemServices = NULL; IEnumWbemClassObject * pEnumObject = NULL; BSTR bstrNamespace = (L"root\\cimv2"); if(CoCreateInstance ( CLSID_WbemAdministrativeLocator, NULL , CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER , IID_IUnknown , ( void ** ) & pIWbemLocator ) != S_OK) return; if(pIWbemLocator->ConnectServer( bstrNamespace, // Namespace NULL, // Userid NULL, // PW NULL, // Locale 0, // flags NULL, // Authority NULL, // Context &pWbemServices ) != S_OK) return; HRESULT hRes; // BSTR strQuery = (L"Select * from Win32_PhysicalMedia"); BSTR strQuery = (L"Select * from Win32_PhysicalMedia"); BSTR strQL = (L"WQL"); hRes = pWbemServices->ExecQuery(strQL, strQuery,WBEM_FLAG_RETURN_IMMEDIATELY,NULL,&pEnumObject); if(hRes != S_OK) { MessageBox("Could not execute Query"); return; } ULONG uCount = 1, uReturned; IWbemClassObject * pClassObject = NULL; hRes = pEnumObject->Reset(); if(hRes != S_OK) { MessageBox("Could not Enumerate"); return; } hRes = pEnumObject->Next(WBEM_INFINITE,uCount, &pClassObject, &uReturned); if(hRes != S_OK) { MessageBox("Could not Enumerate"); return; } VARIANT v; //BSTR strClassProp = SysAllocString(L"SerialNumber"); //Product BSTR strClassProp = SysAllocString(L"SerialNumber"); hRes = pClassObject->Get(strClassProp, 0, &v, 0, 0); if(hRes != S_OK) { MessageBox("Could not Get Value"); return; } SysFreeString(strClassProp); _bstr_t bstrPath = &v; //Just to convert BSTR to ANSI char* strPath=(char*)bstrPath; if (SUCCEEDED(hRes)) { VariantClear( &v ); pIWbemLocator->Release(); pWbemServices->Release(); pEnumObject->Release(); pClassObject->Release(); CoUninitialize(); return strPath; } else { MessageBox("Error in getting object"); return; } VariantClear( &v ); pIWbemLocator->Release(); pWbemServices->Release(); pEnumObject->Release(); pClassObject->Release(); CoUninitialize(); return; Tag: How to ? out argument in managed c++ Tag: 278145
  - 8
    - Need advice on creating COM interfaces Hello! I want to design a plug-in architecture for our application. It will be used to do conversion between data formats. I have the ideas thought out as C++ abstract base classes, and I would like to transfer this to the world of COM. We are currently using VC7.1, mostly in C++. Now I would like to get some tips on how to proceed. I don't have any experience creating COM servers. There seem to be so many options of how to define the interfaces: * Write interfaces in MIDL. This I don't really want to do (complex). * Write classes in C++ and use attributes (this will generate idl for me?) * Write interfaces in a .NET assembly, and #import them into C++. This sounds like the easiest way to get started. It is important that I am able to share our interfaces with 3rd parties that use Visual Studio. Let's say I choose the third option. If I understand correctly, I would distribute the .NET assembly with the interfaces. Anyone can then create COM servers that implement the interfaces. Is this a good way to do it? I will greatly appreciate any recommendations! -- Daniel Tag: How to ? out argument in managed c++ Tag: 278132
  - 9
    - C++ 101 dumb question I'm new to C++ and I'm trying to get my head round how memory is managed. Take a look at this:- Class CMyClass { private: char * m_str; public: CMyClass(char * str) { m_str = str; } ~CMyClass(void) { // Do I need to anything with m_str } } function a() { CMyClass ThingInA; ThingInA = b(); } function b() { CMyClass ThingInB("Hello World"); return ThingInB; } If I understand things correctly both ThingInA and ThingInB are allocated off the stack. return in functon b()copies the contents fo ThingInB to ThingInA. Has a constructor been executed for ThingInA before b is executed? There isn't one defined for void. When b returns does a destructor happen for the contents of ThingInA first? Where is the memory to store the "Hello World" string allocated? I guess it's in the module somewhere and is treated as const, in which case I should be using const char above right? TIA for patient answers, Anthony. Tag: How to ? out argument in managed c++ Tag: 278131
  - 10
    - [unicode] arabic general code -> context form code Hello @ All ! I have a problem with arabic unicode, and I hope you can help me. I was searching the last 2 days for a solution, but without success.. So, my problem: I have a database with a table with one field which content is a arabic string. I get the data in the arabic general unicode format [0600-06FF]. BUT I have to convert this one into the Contextual Forms Unicode (depends on the position of the character e.g. Initial, Medial, Final and Isolated). Is there a algorithm in visual studio or in windows or something like that? I am not a specialist in arabic language, so I don't know in which case the character has to be in which form and code. Hope, my english is good enough for understanding my problem! Hope, you can help me, too :) Thanks a lot in advance, Greetings, Matze Mueller Tag: How to ? out argument in managed c++ Tag: 278122
  - 11
    - The System cannot execute the specificed program I am using VC++ creating a program running SendMessageTimeout to changing global environment variables without reboot. SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (LPARAM) "Environment", SMTO_ABORTIFHUNG, 5000, &dwReturnValue); refer to the link http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b104011 after I created the exe program and run it. it run without error on my laptop, without error on my test Window2003 server, but some machine had "The System cannot execute the specificed program". Secondly, I open 2 dos prompt to test the environment is changed. 1 dos prompt set a new variable in the environment, then run the program with sendmessagetimeout, then type set on the 2nd dos prompt, the new variable did not appear on the 2nd dos prompt. ??? I have 2 problem. 1. why some machine cannot run the executable? 2. how to changing the environment variable and make it effective, without reboot the machine? help Tag: How to ? out argument in managed c++ Tag: 278120
  - 12
    - File compression in .NET - for very large files Hi I want to compress and decomress files. There is GZipStream class in .Net. However this class requires to allocate buffer equal to the file length to zip it (at least all sample code I saw were like that). The file size in my case can be really very large and hence I want something which does not require to load entire file in memory. Is there any way? Thanks and best regards Amit Dedhia Tag: How to ? out argument in managed c++ Tag: 278112
  - 13
    - corrupt intellisense This post is just informative and relates to Visual Studio 2005. My Class View wasn't updating after changing variables in a class and was also showing a class that didn't exist in the solution (I had removed any reference to it and actually deleted the files). The solution compiled and ran without a problem. As a test, I deleted the solution's *.ncb file, the intellisense database. VS built a new database and the problem was solved. (The old file was 23 meg and the new one 11kb.) Regards, Ron Francis www.RonaldFrancis.com Tag: How to ? out argument in managed c++ Tag: 278103
  - 14
    - Synchronous Queue in VC++ I'm porting an application from a Unix like system to Windows. The application uses FIFO queues to pass data between threads. The calling thread has the option of either suspending until data arrives on the queue or returning with NULL after a timeout if no data arrives. Is there any similar component provided by VC++, Visual Studio 2005? Tag: How to ? out argument in managed c++ Tag: 278099
  - 15
    - _CrtIsValidHeapPointer Assertion in C++/CLI Application Debug mode. Hi, I am getting _CrtIsValidHeapPointer Assertion in C++/CLI Application Debug mode in VS 2005. Expression: _CrtIsValidHeapPointer(pUserData) ****************************** It is breaking in dgbheap.c. Here are steps: 1) I created application in VS2005 : Project type - VC++ Visual Studio Installed Template - WindowsFormsApplication. I added a dialog resource to this project and a class to the dialog which is MFC dialog class. I also changed the following project properties and their values: a) CLR - /clr b) Use MFC as Shared DLL c) Linker ->advanced -> CLR Unmanaged Code Check - Apply Unmanaged Code Check (/CLRUNMANAGEDCODECHECK) When I run this app in the debug mode I get the assertion with Expression: _CrtIsValidHeapPointer(pUserData). Any help/url is appreciated. Thanks a lot, Arti Tag: How to ? out argument in managed c++ Tag: 278087
  - 16
    - top-posting I have read the term top-posting twice now so I looked it up to see what it was. I gather some here frown on top-posting and would prefer bottom-posting? When scanning through the posts, it seems to be a mixed bag. So, is there an etiquette here on how to post? If there is, I use Email Express, and by default, it top-posts. I had a quick look through the options and help and couldn't find any way to change its settings so I'm wondering how others deal with it. If it's not an issue, then I won't bother because I actually prefer top-posting. Regards, Ron Francis www.RonaldFrancis.com Tag: How to ? out argument in managed c++ Tag: 278075
  - 17
    - GetScrollRange(, &maxpos) & GetScrollLimit() Env: WindowsXP, VC++6.00 Who would like to tell me why maxpos1 != maxpos2 by the following two functions CScrollBar *pScrollBar; int maxpos1; int maxpos2; (1)pScrollBar->GetScrollRange(, &maxpos1) ; (2)maxpos2 = pScrollBar->GetScrollLimit(); TIA William Tag: How to ? out argument in managed c++ Tag: 278073
  - 18
    - Generating a Random Number How would I generate a random number within a range for example between 128 and 1400 ? Tag: How to ? out argument in managed c++ Tag: 278069
  - 19
    - Heap reallocation Hi, Conventionally when you do this, the pointer gets invalidated. a = malloc (100); a = realloc (a, 200); With the second statement, the "a" no longer points to where the original "a" points to. So My question is if under the new heap management methods (using "new") the pointer would not be invalidated? and also would be automatically managed (when doing resize etc) Thanks Tag: How to ? out argument in managed c++ Tag: 278037
  - 20
    - ms CRT(stdio) bug? Env: winxp , ms vc++6.0, save string"1111111111111111" into 1.txt in DiskC #include <stdio.h> void main() { byte byBuffer[1024]; FILE *fp = fopen("C:\\1.txt", "r+"); //check error skip! fread(byBuffer, 4, 1, fp); fwrite("hello", sizeof("hello")-1, 1, fp); fflush(); fclose(fp); } result: write failed! need to insert fseek(Current), a logic bug? Tag: How to ? out argument in managed c++ Tag: 278034
  - 21
    - Using VS2005/C++, how to create a function call (directed) graph or cross ref. table It would be nice if the scope is adjustable to a single file or an entire project and and filtering should allow to include/exclude class objects' methods, etc. Am I missing something understanding that such a fundamental service is not available in VS2005+SP1? Anybody knows if it is by chance available in VS2008 ("Orcas")? Does anybody know about an add-in (for VS2005) or completely stand alone executable by third parties that does the job? Thanks in advance, David Tag: How to ? out argument in managed c++ Tag: 278033
  - 22
    - multi threaded dll Hi,. I am trying to build a multithreaded dll file, as I am new to that sort of things I've followed a tutorial step by step but still can't get things to work. I am using Visual C++ 2005 Express Edition and have installed the Microsoft Platform SDK for Windows Server 2003 SP1. When I am building my project I am getting the following error log: 1>------ Build started: Project: my_array, Configuration: Release Win32 ------ 1>Compiling... 1>my_array.c 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1778) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1778) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1778) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Platform SDK\Include\poppack.h(29) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>C:\Program Files\Microsoft Platform SDK\Include\poppack.h(29) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : error C2011: 'localeinfo_struct' : 'struct' type redefinition 1> C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1701) : see declaration of 'localeinfo_struct' 1>C:\Program Files\Microsoft Visual Studio 8\VC\include \crtdefs.h(1778) : warning C4161: #pragma pack(pop...) : more pops than pushes 1>Build log was saved at "file://e:\My Documents\Visual Studio 2005\Projects\my_array\my_array\Release\BuildLog.htm" 1>my_array - 6 error(s), 6 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== thanks tons for help Tag: How to ? out argument in managed c++ Tag: 278031
  - 23
    - '^' in C++ Managed Code under .NET I was going over MSDN to find a way to enumerate files using C++ under the .NEt framework. I came across some syntax that looks like: DirectoryInfo^ di = gcnew DirectoryInfo("..\\GA\\Files"); array<FileInfo^>^fiArr = di->GetFiles(); Collections::IEnumerator^ myEnum = fiArr->GetEnumerator(); while ( myEnum->MoveNext() ) { FileInfo^ fri = safe_cast<FileInfo^>(myEnum->Current); Console::WriteLine( fri->Name ); } My question is, what are all the "^" and if there is any documentation anyone knows off so that I can read about it regards, Abhi Tag: How to ? out argument in managed c++ Tag: 278017
  - 24
    - How to delete pointers held inside a vector Hi, I have a class named MC. Header contains the following: struct tCDV { int intC long lngR; bool blnE; CString strC; }; tCDV* p_cDV; const int BUFF_SIZE; std::vector<tCDV*> m_cDV; Unit contains the following: MC::MC(): BUFF_SIZE(32) { } MC::Test() { p_cDV = new tCDV[BUFF_SIZE]; p_cDV->intC = cc; //cc initialised elsewhere in program p_cDV->lngR = cr; //cr initialised elsewhere in program p_cDV->blnE = file.read_bool(); // file.read_bool() initialised elsewhere in program p_cDV->strC = file.read_string(); // file.read_string() initialised elsewhere in program m_cDV.push_back(p_cDV); } All the above works fine. My problem is that I receive memory leaks on program exit and the debugger points to: p_cDV = new tCDV[BUFF_SIZE]; I attempted to iterate through the vector: m_cDV (via the destructor of class MC), deleting the pointers p_cDV but to no avail. So, I scrapped the iteration code. Please can someone assist me in resolving this problem. Thanks. Colin Tag: How to ? out argument in managed c++ Tag: 278010
  - 25
    - VC6 -> VC8 (VS2005) CComModule Hi, I'm porting one of the dll from vc6 to vc8 and I have one problema about CComModule. My code use in stdafx.h: extern CComModule _Module and in my main module I use: CComModule _Module; but when i compile my code, i have the erros messages: 3>c:\temp\driverplc\driverplcs7\s7tcp\stdafx.h(24) : error C2146: syntax error : missing ';' before identifier '_Module' 3>c:\temp\driverplc\driverplcs7\s7tcp\stdafx.h(24) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 3>c:\temp\driverplc\driverplcs7\s7tcp\stdafx.h(24) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int Can help me? thanks. -- ______________________________________ Fabiano de Souza Maciel Microsoft MCSD, MCDBA, MCP fabiano_maciel at hotmail.com ______________________________________ Tag: How to ? out argument in managed c++ Tag: 278007
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  - 1
    - How can I generate a file dependent on linker output, which the linker then needs to generate the final dll using VS2005? I need to process the map file that's generated by link on a C++ project, in order to generate the the .DEF file I really want to link with. Effectively, I want to make only some of the exports from my DLL available, and also I want to reference them by ordinal only. For those of you who have looked at how MFC works, will recognize this as being similar to the method in MFC80.def I can't really see any way to do this, as there doesn't seem to be any simple way to run the link command again with similar arguments to those generated automatically. However, I did come up with this idea: Write a new program named link.exe that runs the original link command with the command line specified, then run whatever processing my program needs then run the link command again. Is there any easy way to get MSBUILD to use a different tool for link, like setting some environment variable or instance, or must I resort to making the search path for exe's find mine first? Secondly, if I do go down this route, will I be able to get the output of the real link tool back into MSDEV? Anthony Wieser Wieser Software Ltd Tag: How to ? out argument in managed c++ Tag: 278006
  - 2
    - how to get pointer variable value from a dll Hi all, I have a DLL which has a output parameter LPVOID, A application calls this DLL function, the Dll responsibility is to assign a valid pointer to the lpBuffer, Till here it is OK, but once it returns to the Application this lpBuffer becomes NULL. Prototype, __declspec(dllexport) BOOL TRSTMonGetStatus(LPVOID lpBuffer) Please let me know what to do, i am stuck in this. Tag: How to ? out argument in managed c++ Tag: 278002
  - 3
    - How to dynamically allocate dual-dimension array of BYTE's ? It should be a simple question. I have 2 arguments X and Y. I need to allocate a dual-dimension array of BYTE's using dynamic allocation 'new' of size X and Y, After the allocation is done, I want to access any element in the array in the form byteArr[x][y]; How do I dynamically allocate this dual-dimension array of BYTE's ? -- Thanks Sharon Tag: How to ? out argument in managed c++ Tag: 278001
  - 4
    - RegisterHotKey Problem Hi all, I am having problem with RegisterHotKey API. I am having a list control I will be pressing F5 for refreshing the items in the list control. Everthing is fine. ::RegisterHotKey(hWnd, ID_REFRESH, NULL, VK_F5); But F5 is not working for orher windows when my window is active. For Eg If I open a ppt and click F5 its not going to slideshow mode because still my app window is not closed. Is there any two prevent this and work F5 for all windows which is active. Thanks in advance. Regards, Umesh P Tag: How to ? out argument in managed c++ Tag: 277995
  - 5
    - How to call an MFC function of a DLL in a COM component project? Hello (Sorry if the question is simple I am a newbie.) I should develop a COM Component (an OCX file) using VC++ that accepts three parameters in a method and pass them to a MFC DLL function. I just have the signature of the MFC DLL function not the source code. How can I register and call the MFC function in my OCX function? What is the steps I should follow? I use MS Visual Studio 2005 in XP SP2. Thanks in advance Hamed Tag: How to ? out argument in managed c++ Tag: 277983
  - 6
    - error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion) Hi, I have written this code, and at the end, I am trying to write a vector of strings into a text file. However, my program is nor compiling, and it gives me the following error when I try to write to the file: error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion) I don't know what I am doing wrong. I have posted my entire program here. Thank you #include <iostream> #include <fstream> #include <iterator> #include <algorithm> #include <vector> #include <math.h> #include "string.h" using namespace std; char n_str[2000]; char a_str[2000]; char n_char[2000]; char a_char[2000]; string achar, nchar; int main(int argc, char* argv[]) { vector<string> n_word_list; vector<string> a_word_list; ifstream in_a("10_a.txt"); if (!in_a) { cout << "Error opening abnormal file" << endl; } while (!in_a.eof()) { in_a.getline(a_str,2000); a_word_list.push_back(a_str); } cout << a_word_list.size()<< endl; ifstream in_n("10_n.txt"); if (!in_n) { cout << "Error opening normal file" << endl; } while (!in_n.eof()) { in_n.getline(a_str,2000); n_word_list.push_back(a_str); } cout << n_word_list.size()<< endl; for (unsigned int i=0; i<a_word_list.size(); i++) { for (unsigned int j=0; j<n_word_list.size();j++) { if (a_word_list[i].compare( n_word_list[j])) { a_word_list.assign(1,"aa"); n_word_list.assign(1,"aa"); } } } ofstream out_a("10_a_new.txt"); if (!out_a) { cout << "Error opening new abnormal file" << endl; } for (unsigned int i=0; i<a_word_list.size(); i++) { achar = a_word_list.at(i); out_a << achar << endl; //ERROR } ofstream out_n("10_n_new.txt"); if (!out_n) { cout << "Error opening new normal file" << endl; } for (unsigned int i=0; i<n_word_list.size(); i++) { out_n << n_word_list.at(i) << endl; //ERROR } return 0; } Tag: How to ? out argument in managed c++ Tag: 277980
  - 7
    - Pass by value or reference void SetWorldTransform( const D3DXMATRIX *pmxWorld ); is it better to use.... (DirectX stuff) void SetWorldTransform (const D3DXMATRIX& pmxWorld); are they the same? Thx Jack Tag: How to ? out argument in managed c++ Tag: 277978
  - 8
    - openal32.dll (deployment ) hi everyone! i'm codeing a full-size 3d game in vstudio 8/c++. i use openAL 3d digital sound. my question is: when i deploy my game using vstudio 'setup project', how do i automatically install openal32.dll through the setup project? and is openal32.dll all i need? marco RTYpe 6 Tag: How to ? out argument in managed c++ Tag: 277973
  - 9
    - malloc(), realloc(), free in different threads Hi, I'm allocating initial memory in the main UI thread of my application with malloc(). I then create a worker thread and pass that memory on for its use. The worker thread will call realloc() if required as the memory requirements grow. Later, inside my main UI thread, I call free() on the original memory pointer (which appears to be intact). However, I'm failing an assert in dbgheap.c at the following line: * If this ASSERT fails, a bad pointer has been passed in. It may be * totally bogus, or it may have been allocated from another heap. * The pointer MUST come from the 'local' heap. */ _ASSERTE(_CrtIsValidHeapPointer(pUserData)); Am I violating the rules governing the heap? Note, I ensure the memory is not being used by the thread when I call free(). Thanks for any help, maple Tag: How to ? out argument in managed c++ Tag: 277969
  - 10
    - Buffer Overrun Error Hi, I'm using msvc-7.1. A makefile executes the cl.exe app and I get a buffer overrun error. Can I do something like specify a large stack/heap resource? If so, how much? King Tag: How to ? out argument in managed c++ Tag: 277968
  - 11
    - Is VS 2005 "plugginable"? Hi, I want to dump some code byte of a program. Is it possible to write a macro that can dump this kind of info? Any comments are welcome! Thanks Tag: How to ? out argument in managed c++ Tag: 277967
  - 12
    - WaitFor Function for Dialog / Window Hello, Newsgroupians: I have created a program that interacts with a third-party program to which I do not have source code. I want my program to interact with some windows in the foreign application, but only if it does not see a specific dialog, which resides in the foreign application. I can obtain the handle to the dialog. If the dialog box is not there, I want my code to interact, but if the handle is not NULL, I want my program to do something similar to WaitForSingleObject(). I've looked at the thread and process for the foreign application's main window and the dialog box I have an interest in, but both are same, so I can't just wait for the process. I can think of one method to solve my problem by injecting a new window procedure. However, this is lengthy, and I'm not in the mood to implement it. Is there any other solution besides the standard... HWND hwnd; do { hwnd = FindWindowEx(...); Sleep(XXXX); } while (hwnd); Thank you for your time and consideration. Trecius Tag: How to ? out argument in managed c++ Tag: 277953
  - 13
    - Setting cursor for a button? total newbie question... I'm trying to set the cursor for a button in a NON-MFC form (ATL Form?)... I've got the cursor that I want loaded up (the hand) and I can set it in MOUSEMOVE event for the window. But when the cursor moves over the button, I stop getting those events so it is useless. I've also tried calling SetCursor on the GetDlgItem for my button, but that doesn't seem to do anything either. any suggestions? TIA! -mdb Tag: How to ? out argument in managed c++ Tag: 277949
  - 14
    - _SECURE_SCL=0 -> crash Hello, we heavily use the STL in our projects and with vc++ 7.1 the code runs 3 times faster as with v8.1 (in some cases even 100 times or more). For example, clearing a set with 1 million elements takes several minutes instead of one second or so. If _SECURE_SCL=0 is defined in some libraries, the application crashes because of incompatible containers and/or iterators. Therefore we have to disable _SECURE_SCL in all visual studio projects of our application. Is there a way to disable _SECURE_SCL only in some libraries? If this isn't possible, we can't give our binary libs to our customers, because they probably have _SECURE_SCL enabled. It looks like we have to live with this secure thing (which is unacceptable because it is very slow), switch back to 7.1 (that is impossible if our customers use v8) or use C-APIs for every lib we release (we do that now but it is costly and not very convenient for our customers). Is there another way? thanks in advance -- Sebastian Pfützner s.pfuetzner@onlinehome.de ICQ-ID: 39965036 Tag: How to ? out argument in managed c++ Tag: 277945
  - 15
    - How to draw a simple division circuit? Hi all: I'm working on the demostration of the encoder of cyclic code using visual c++. First a division circuit should be showing .just like http://www.ee.uwa.edu.au/~roberto/teach/itc314/java/CRC/crc.html The Cyclic Code Encoder / Decoder is great. But I'm new to vc++ .So have no idea how to draw the circuit.Is there any api easy to use? Or I should combine some rectangle/line/circle to get it. Thanks a lot. Tag: How to ? out argument in managed c++ Tag: 277939
  - 16
    - Share heap between DLL's I have a quite large project written originally in BC5, and I am currently porting it to Visual C++ (VS2005) using OWLNext (www.owlnext.com). The program itself is now "converted", and it is running, but with errors. The error that concerns me the most is that I get heap error when trying this simple thing: 1) Creating a char* 2) Setting this char* to a new duplicate of another char* - this is done in another DLL. 3) Deleting this char* Example code: void ParseLine(char* line) { char* xNumStr; xNumStr = strnewdup(line); delete[] xNumStr; } strnewdup is a part of OWL (and owl-dll) and goes like this: strnewdup(const char* s, size_t allocSize) { if (!s) s = ""; int alloc = max(strlen(s)+1, allocSize); return strcpy(new char[alloc], s); } It's the delete[] in ParseLine that gives the error, which states that the heap is corrupt (I am running in debug-mode). If I move the strcpy-call from owl-dll to within ParseLine code, I get no error. This code works in BC5, but not in VC. I suspect it has to do with the heap being private for each DLL, but I'm not sure. If I need to change the code, I have to do it hundredths of places, and I really do not want to do that. Can anyone tell me why this error occurs, and maybe help me with how to fix it without changing the code too much?!? Tag: How to ? out argument in managed c++ Tag: 277938
  - 17
    - how to compress HI all, I have some files and folders are there in "parent" folder. How do I zip this "parent" folder through vc++ program? -- Thanks & Regards, John. Tag: How to ? out argument in managed c++ Tag: 277927
  - 18
    - Get license related information in Windows Vista Hi, In Windows Vista, executing slmgr.vbs script with -dli or -dlv option displays the license status, product key and a host of other information. Is there any way in which i can get all this information (especially the license status) programmatically ? I am programming in C++/VC++ and using VS2005. Please help !! Thanks in advance... Tag: How to ? out argument in managed c++ Tag: 277926
  - 19
    - Precision print doubles manipulator Hello! I've just created a stream manipulator that "precision formats" doubles. I wanted a way to write doubles so that the number of decimals is of a minimum precision. For example, I want all doubles to be written with up to 6 digits, if necessary, but less digits if possible. So the value 5 is written as 5 and 0.9999999 as 1. Let me demonstrate with some examples that write doubles with up to 6 decimals: std::cout << precision_fmt<6>(5.) << std::endl; std::cout << precision_fmt<6>(40.873918842465351) << std::endl; std::cout << precision_fmt<6>(19025.898942144981) << std::endl; std::cout << precision_fmt<6>(-100.00000002082101) << std::endl; std::cout << precision_fmt<6>(44.705924135090932) << std::endl; std::cout << precision_fmt<6>(-300.00000161733300) << std::endl; std::cout << precision_fmt<6>(19126.088206883647) << std::endl; std::cout << precision_fmt<6>(19154.942990107313) << std::endl; std::cout << precision_fmt<6>(-299.99999975125598) << std::endl; std::cout << precision_fmt<6>(299.99999826326098) << std::endl; std::cout << precision_fmt<6>(149.99999990337500) << std::endl; std::cout << precision_fmt<6>(-300.00000184236200) << std::endl; std::cout << precision_fmt<6>(0.0045) << std::endl; precision_fmt is a template where the parameter indicates the desired precision. This outputs the following: 5 40.873919 19025.898942 -100 44.705924 -300.000002 19126.088207 19154.94299 -300 299.999998 150 -300.000002 0.0045 One place where this is useful is when dealing with Xml. I think it is nice to limit the size of the output. Now to the code :-) I have used Angelika Langer's method of creating manipulators. template <class Manip> class manip_base { public: template <class Stream> Stream& manipulate(Stream& str) const { return static_cast<const Manip&>(*this).fct(str); } }; template <class Ostream, class Manip> Ostream& operator<< (Ostream& os, const manip_base<Manip>& m) { return m.manipulate(os); } template<std::streamsize N> struct precision_fmt : public manip_base<precision_fmt> { double m_d; precision_fmt(double d) : m_d(d) {} static double RoundDouble(double doValue, std::size_t nPrecision) { static const double doBase = 10.0; double doComplete5, doComplete5i; doComplete5 = doValue * pow(doBase, (double) (nPrecision + 1)); if(doValue < 0.0) doComplete5 -= 5.0; else doComplete5 += 5.0; doComplete5 /= doBase; modf(doComplete5, &doComplete5i); return doComplete5i / pow(doBase, (double) nPrecision); } template<class Stream> Stream& fct(Stream& stream) const { struct saveFlags { Stream& m_stream; std::ios_base::fmtflags m_flags; saveFlags(Stream& stream) : m_stream(stream), m_flags(stream.flags()) {} ~saveFlags() { m_stream.flags(m_flags); } } saveFlags(stream); std::streamsize decimals = 0; for( std::streamsize i=N; i>0; i-- ) { if( RoundDouble(m_d, i-1)!=RoundDouble(m_d, i) ) { decimals = i; break; } } stream.setf(std::ios_base::fixed); stream.precision(decimals); stream << m_d; return stream; } }; Hopefully somebody will also find this useful. Any comments? -- Daniel Tag: How to ? out argument in managed c++ Tag: 277922
  - 20
    - Memory problems when deleting a vector element I have a vector member variable like this: typedef struct { void **p_func; unsigned char id; } struct1; typedef vector < struct1> list; typedef struct { CString func_name; list req_list; int owner_id; void *p_func; } entry; typedef vector <entry> tbl; class X {... tbl m_table; } In one of the member functions of Class X, occasionally, the operator delete for CString for the "delete m_table[i]" line gives a problem. Any ideas on how to prevent that? for (i=0; i<m_table.size(); i++) { delete m_table[i]; m_table.erase(m_table.begin() + i); i--; } Thanks. Tag: How to ? out argument in managed c++ Tag: 277911
  - 21
    - issue using a dll hi all, i am using zlibwapi.dll from "zlib123dll.zip" (i downloaded it from the minizip site -> http://www.winimage.com/zLibDll/minizip.html ). this dll provides functions for zipping / unzipping files. i am getting stuck in usage of the 'unzLocateFile' function. i am loading the dll using LoadLibrary, and getting the address of the function using GetProcAddress. Now, to use 'unzLocateFile' , i need to typedef it. This is where i am getting stuck, a detailed description is as under - in unzip.h (the source of minizip), its prototype is defined as - extern int ZEXPORT unzLocateFile OF((unzFile file, const char *szFileName, int iCaseSensitivity)); i went looking for declaration of unzFile(its a structure), which lead me to z_stream. This structure has the following - 1> alloc_func 2> free_func 3> voidpf which are defined as - > #define voidpf z_voidpf #define alloc_func z_alloc_func the problem is that there is nothing more than the two defines listed in the above lines. So, I am not being able to make a typedef for unzFile :( can anyone provide me with more info? how do I typedef the function I am to call here? any help will be mucho appreciated... :) thanks Tag: How to ? out argument in managed c++ Tag: 277910
  - 22
    - Restricting access to COM objects Hello! Is there a recommended way to restrict access to local COM objects? I want to make sure that some COM-based plugins can only be used by my specific application. Any tips would be very helpful! -- Daniel Tag: How to ? out argument in managed c++ Tag: 277908
  - 23
    - Overidables and wizard generated stub code for MFC - Studio 2005 - I can't find any documentation on this subject. Did Microsoft eliminate this feature or just hide it? How do I get the studio to give me this functionality? Tag: How to ? out argument in managed c++ Tag: 277905
  - 24
    - Stepping into wrong function I have an interface that lists some methods: ----------IToken.h----------------- public IToken { virtual string getSomeToken() = 0; virtual void setSomeToken(string tt) = 0; } ---------MyToken.h--------------- public MyToken: public IToken { private: string m_tt; public: string getSomeToken(); void setSomeToken(string tt); } ---------MyToken.cpp------------ string MyToken::getSomeToken(){ return m_tt; } void MyToken::setSomeToken(string tt){ m_tt = tt; } Now this has been working all along. Suddenly I decided to add 2 more methods: ----------IToken.h----------------- public IToken { virtual string getSomeToken() = 0; virtual void setSomeToken(string tt) = 0; virtual string getToken2() = 0; virtual void setToken2() = 0; virtual string getToken3() = 0; virtual void setToken3() = 0; } ---------MyToken.h--------------- public MyToken: public IToken { private: string m_tt; string m_tok2; string m_tok3; public: string getSomeToken(); void setSomeToken(string tt); string getToken2(); void setToken2(); string getToken3(); void setToken3(); } ---------MyToken.cpp------------ string MyToken::getSomeToken(){ return m_tt; } void MyToken::setSomeToken(string tt){ m_tt = tt; } void MyToken::setToken2(){ m_tok2 = "preset_token2"; } string MyToken::getToken2(){ return m_tok2; } void MyToken::setToken3(){ m_tok3 = "preset_token3"; } string MyToken::getToken3(){ return m_tok3; } What happens when I run it under the debugger is that the if some code is calling the new method setToken3(), the debugger steps into setToken2(). It does this consistently. I have deleted all obj files, pdb files, exp, ilk, etc. and exe files that are generated by the VC build process and cleaned and rebuilt from scratch. But it didn't do any good. The same thing happens. I believe this is a well-known problem with VC's implementation of V- tables. Can someone please guide me as to how to go about solving this? Thanks in advance. Tag: How to ? out argument in managed c++ Tag: 277901
  - 25
    - ref:Q140723 Hi, I have a question about this article:How to force a screen saver to close once started in Windows NT, Windows 2000, and Windows Server 2003: // If there is no screen saver desktop, the screen saver // is on the default desktop. Close it by sending a // WM_CLOSE. PostMessage(GetForegroundWindow(), WM_CLOSE, 0, 0L); However, I failed to close it by sending a WM_CLOSE, i.g. PostMessage(GetForegroundWindow(), WM_CLOSE, 0, 0L). I can only terminate it by simulating a set cursor. I am using windows xp. Tag: How to ? out argument in managed c++ Tag: 277897

Hello gurus,

I have the following C# function signature:
void TheFunction(Dictionary<string, MyClassObj> dicName, out int nOne, out
int nTwo, out int nThree, out int nFour);

And it works fine.

I'm trying to write a managed C++ function that will save the save
signature, but till now I've got all kind of compiler error.

Can anyone tell me how a managed C++ function signature should look like
that will do the job like the one I showed above?

--
Thanks
Sharon

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Re: How to ? out argument in managed c++ by Ben

Ben
Thu Jun 21 18:05:23 CDT 2007

"Sharon" <SharonG@newsgroups.nospam> wrote in message
news:B46798EB-33D1-443A-8981-2C12397C8189@microsoft.com...
> Hello gurus,
>
> I have the following C# function signature:
> void TheFunction(Dictionary<string, MyClassObj> dicName, out int nOne, out
> int nTwo, out int nThree, out int nFour);
>
> And it works fine.
>
> I'm trying to write a managed C++ function that will save the save
> signature, but till now I've got all kind of compiler error.
>
> Can anyone tell me how a managed C++ function signature should look like
> that will do the job like the one I showed above?

Already answered in microsoft.public.dotnet.languages.vc

This is the wrong group, please don't multipost.

>
>
> --
> Thanks
> Sharon

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Re: How to ? out argument in managed c++ by SharonG

SharonG
Fri Jun 22 04:34:02 CDT 2007

Yes, I did post it in another group. I wasn't sure which group is the one for
it.
Sorry about that.

As I said, your solution works fine.

---------
Thanks
Sharon

Top