linking into a shared library

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  - 1
    - console output A friend of mine is working on a service application for me. He is trying to write to the console during the command line installation and registration of the service but the printf does not produce output. (neither does the writefile stdio. Also interestingly changing the winmain to main results in duplicate declaration of new and dispose. any ideas? tia -- peter walker Access MVP Tag: linking into a shared library Tag: 228933
  - 2
    - TRACE Not working There are the two files in the project: //MyApp.cpp #include <afxwin.h> // MFC library header file declares base classes #include "MyApp.h" CMyApp theApp; // the one and only CMyApp object BOOL CMyApp::InitInstance() { m_pMainWnd =3D new CMyFrame(); m_pMainWnd->ShowWindow(m_nCmdShow); m_pMainWnd->UpdateWindow(); return TRUE; } BEGIN_MESSAGE_MAP(CMyFrame, CFrameWnd) ON_WM_LBUTTONDOWN() ON_WM_PAINT() END_MESSAGE_MAP() CMyFrame::CMyFrame() { Create(NULL, "MYAPP Application"); } void CMyFrame::OnLButtonDown(UINT nFlags, CPoint point) { TRACE("Entering CMyFrame::OnLButtonDown - %1x, %d, %d\n", (long)nFlags, point.x, point.y); } void CMyFrame::OnPaint() { CPaintDC dc(this); dc.TextOut(0, 0, "Hello, world!"); } //End MyApp.cpp // MyApp.h // application class class CMyApp : public CWinApp { public: virtual BOOL InitInstance(); }; // frame window class class CMyFrame : public CFrameWnd { public: CMyFrame(); protected: // "afx_msg" inicates that the next two functions are part // of the MFC library message dispatch system afx_msg void OnLButtonDown(UINT nFlags, CPoint point); afx_msg void OnPaint(); DECLARE_MESSAGE_MAP() }; // End MyApp.h The TRACE statement is in MyApp.cpp above. I assume this should fire = when I left-click in the Window or on the Title Bar or on the Window = frames. But no matter where I LButton nothing happens. So am I = misunderstanding what the TRACE statement should be doing? If anything? = The executable is a debug version. Thanks. --=20 George Hester __________________________________ Tag: linking into a shared library Tag: 228932
  - 3
    - error C2678, string "+" Hello I am learning Object Oriented Programming with C++ I am using Microsoft Visual C++ 2003 I got the following error message when I tried to complie the following piece of codes Error Message: error C2678: binary '+': no operator found which takes a lefthand operand of type 'std::string Sample Codes #include <iostream #include <string #include "stdafx.h" // this comes automatically when I created the projec int _tmain(int argc, _TCHAR* argv[]) // this comes automatically when I created the projec std::cout << "Hello, World!" << std::endl std::string s1="abc" std::string s2="def" std::string s3 s3 = s1 + s2 Can someone point me to the right direction please Should I be using a different option when I created a new project? (I am using Win32 console application I think Thanks Tony Tag: linking into a shared library Tag: 228930
  - 4
    - Simple question How to get the cpp file name, and the current line number in in my C++ code Is there any macros defined for these purposes Thank you.. Janet Tag: linking into a shared library Tag: 228926
  - 5
    - Help me ! How to get 'IRowsetFind' interface in oledb sdk !(provider is SQLOLEDB) dear all i will use following code in my program(C++) discover 'pICommandProperties->SetProperties(1,rgInitPropSet);' return failed code 'DB_S_ERRORSOCCURRED so 'pIRowset->QueryInterface(IID_IRowsetFind,(void **)&pIRowsetFind);' return failed dear all, please help me! how to get 'IRowsetFind' interface in oledb sdk , and how to use 'IRowsetFind->FindNextRow() InitProperties[0].dwPropertyID=DBPROP_IRowsetScroll InitProperties[0].dwOptions=DBPROPOPTIONS_REQUIRED InitProperties[0].dwStatus=DBPROPSTATUS_OK InitProperties[0].colid=DB_NULLID InitProperties[0].vValue.vt=VT_BOOL InitProperties[0].vValue.boolVal=VARIANT_TRUE InitProperties[1].dwPropertyID=DBPROP_IRowsetFind InitProperties[1].dwOptions=DBPROPOPTIONS_REQUIRED InitProperties[1].dwStatus=DBPROPSTATUS_OK InitProperties[1].colid=DB_NULLID InitProperties[1].vValue.vt=VT_BOOL InitProperties[1].vValue.boolVal=VARIANT_TRUE rgInitPropSet[0].cProperties=2 rgInitPropSet[0].guidPropertySet=DBPROPSET_ROWSET rgInitPropSet[0].rgProperties=InitProperties hr=pICommandText->QueryInterface(IID_ICommandProperties,(void **)&pICommandProperties) hr=pICommandProperties->SetProperties(1,rgInitPropSet) if (DB_S_ERRORSOCCURRED==pICommandProperties->SetProperties(1,rgInitPropSet) cout<< "test" if(FAILED(hr) cout<< "OLEDB Error !\r\nExecute Failed To Set Rowset Properties" hr = pIRowset->QueryInterface(IID_IRowsetFind,(void **)&pIRowsetFind) if(FAILED(hr) cout << "Failed to get IID_IRowsetFind interface.\n" cout << endl } //end i Tag: linking into a shared library Tag: 228925
  - 6
    - rewrite __security_error_handler I'd like to rewrite the __security_error_handler function in secfail.c, but I don't want to compile the VC7 libraries and redistribute it. I've tried to just declare __security_error_handler in my program but it continues to execute the code in the VC7 library. Any suggestions would be appreciated. Thanks! Tag: linking into a shared library Tag: 228921
  - 7
    - Copying structs in BYTE buffers I have the following structs defined. I ultimately want to copy UserInfo into a BYTE buffer to send to an RS232 serial port. typedef struct u_32 prot_ver; u_32 nomem_ver u_32 func_units; u_32 sysType; u_32 startupMode AttributeList option_list; AttributeList supported_aprofiles; } UserInfo typedef struct u_16 attribute_id; u_16 length; u_16 attribute_val; } AVAType typedef struct u_16 count; u_16 length; AVAType value[1] } AttributeList I have a buffe msgBuffer = new BYTE [1000] and i'm tryin to do memcpy (msgBuffer, (BYTE *) &UserInfo, sizeof (UserInfo) The first 5 fields copy, but the AttributeList struct field dont copy immediately behind the u_32 in my msgBuffer. : I basically need the 'count' field of the AttributeList immediately behind the 'StartupMode' field Some its not copying right. :( HELP?!?!?!?!?? -C Tag: linking into a shared library Tag: 228914
  - 8
    - String to file Hi A simple question: suppose I have a string (size unkown, but can assum to be normal), what's the SIMPLEST way to create a file and write the string to the file Thanks Peter Tag: linking into a shared library Tag: 228904
  - 9
    - Help with Math.Round()... Hello all, It's been a long while since I've used C++ so I need some help here. I was looking for a round() function to use and came across Math.Round method in the online help (VS.NET 2003). When I tried to compile I get error messages that say, Math: Undeclared identifier .Round must have class/struct/union type Do I have to use a specific #include file or is there a special declaration I have to use at the top of the source file? Any help would be appreciated. -U --- "Reports that say something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns -- the ones we don't know we don't know." -- Donald Rumsfeld, making things clear Tag: linking into a shared library Tag: 228903
  - 10
    - C2664: cannot convert... What is going on here? Can somebody please explain this one to me??? <snip> G:\Othersyde\source\othersyde\COSBSPWorld.cpp(49) : error C2664: 'LoadInfo' : cannot convert parameter 1 from 'struct OSFileIO::WORLDFILEINFO Othersyde::CBSPWorld::*' to 'struct OSFileIO::WORLDFILEINFO *' <snip> OSFileIO and Othersyde are namespaces, CBSPWorld is a class. This is how I declare the variable in CBSPWorld: OSFileIO::WORLDFILEINFO m_world; I don't get it... Tag: linking into a shared library Tag: 228900
  - 11
    - CToolBar Length problem Hi, there My toolbar has 24 items, and each of them has size (43, 49) as button size, size (35, 19) as image size. Only about 15 items are shown correctly. The others are chopped after a | symbol My code is m_wndToolBar.Create(this, WS_CHILD | WS_VISIBLE | CBRS_TO | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) m_wndToolBar.LoadToolBar(IDR_TOOLBAR) m_wndToolBar.SetButtonText(0, _T("Open 0")) m_wndToolBar.SetButtonText(1, _T("Save 0")) m_wndToolBar.SetButtonText(2, _T("ZoomIn 0")) ............................................................................. m_wndToolBar.SetSizes(CSize(43, 49), CSize(35, 19)) What is the problem here? How to extend the toolbar length Thanks in advance Gary Tag: linking into a shared library Tag: 228895
  - 12
    - mailto with attachment problem What i'm trying to do is programmatically bring up a new message for the default mail client with an attachement already attached. I've successfully been able to bring up a new message with an e-mail address, subject, and body, but i can't attach a file no matter what i try. Some things seem to have no effect, and others seem to cause outlook to bring up a messagebox (Command line arguement is not valid). Here's some mailto: commands i've tried using in shell execute mailto:khorvath@vt.edu?subject=my report&body=see attachment&attachment="\\Gamingmachine\download temp\invoice.html" mailto:khorvath@vt.edu?subject=test&attachment=\\Workpc1\c$\DownloadTemp\redist.txt mailto:khorvath@vt.edu?subject=test&attachment="\\Workpc1\c$\DownloadTemp\redist.txt\" mailto:khorvath@vt.edu?subject=test?&attachment=\\Workpc1\c$\DownloadTemp\redist.txt mailto:khorvath@vt.edu?subject=test?&attachment="\\Workpc1\c$\DownloadTemp\redist.txt\" mailto:khorvath@vt.edu?subject=test?attachment=\\Workpc1\c$\DownloadTemp\redist.txt mailto:khorvath@vt.edu?subject=test?attachment="\\Workpc1\c$\DownloadTemp\redist.txt\" mailto:khorvath@vt.edu?subject=test&attachment="\\Workpc1\DownloadTemp\redist.txt\" mailto:khorvath@vt.edu?subject=test&attachment="c:\DownloadTemp\redist.txt" Of course the format in my cpp file is ShellExecute(NULL,"open","mailto:khorvath@vt.edu?&attachment=\"c:\\redist.tx t\"","","", SW_SHOW ); I've tried more but you get the idea that i've tweaked almost every aspect of this but can never get an e-mail with the attachment to come up. I read one article that said allowing attachments through mailto: is a security risk so it doesn't work. Is this true? I appreciate any information anyone can provide. Thank you very much in advance. Kenji Horvath Tag: linking into a shared library Tag: 228894
  - 13
    - DLL Help I mostly program in C# and am having to create a C++ DLL for another project. I'm having problems with the function names of the dll becoming mangled after compilation. I have searched the newsgroups and only found to use the following line. #define EXPORT extern "C" __declspec (dllexport) EXPORT BOOL CALLBACK TESTFUNC(); However, this is not working. The function names are still becoming mangled. I'm using Visual Studio .NET 2003. Any help is greatly appreciated!! Tag: linking into a shared library Tag: 228891
  - 14
    - USB driver devlopment environment I am a newbie to USB driver development, and at the moment I am to be developing a small program to read data from a USB device - which is effectively a drive I have been looking through the classes and methods for such a project, and header files are listed such as usb100.h and usbscan.h, but I am having difficulty in compiling a project (in Visual c++ .net) that will recognise the functions I am trying to use, e.g GetDescriptor(), and not come come up with all sorts of errors related to the header files themselves, let alone any programming I am trying to do I am developing on winXP, and have installed the DDK for XP Can you help me with this at all? I have looked for tutorials to get me started on this project, with no luck Thanks Tag: linking into a shared library Tag: 228888
  - 15
    - Namespaces: Initializing variables Hi! How can I initialize variables in a namespace? This is what I thought should work: <namespace.h> namespace Aname { DWORD avariable } <namespace.cpp> DWORD Aname::avariable = 0; but apparantly the compiler thinks I am trying to declare a new variable with the same name as in the .h-file. I also know that I can do this: <namespace.h> namespace Aname { DWORD avariable = 0; } but when I include namespace.h in various other .cpp files, i get for example othersyde.obj : error LNK2005: "char (* Global::folder)[260]" (?folder@Global@@3PAY0BAE@DA) already defined in COSGlobalDecl.obj PLEASE help... Tag: linking into a shared library Tag: 228884
  - 16
    - Simple question! int a = 10 // Now how to convert this number to a string? (char* /* Thanks in advance Joe */ Tag: linking into a shared library Tag: 228871
  - 17
    - Can I put #ifdef inside a macro with parameters? I am writing a macro like this #define MACRO(a,b) #ifdef _DEBUG a+b #endif But on compiling I get 2 errors : "Expected macro formal parameters It seems to me that compiler is interpreting #ifdef and #endif as macro parameters Any workaround for this problem? Or can we put precompilers inside a c++ macro TI Sunil Tag: linking into a shared library Tag: 228866
  - 18
    - Bug when generating some inlined (intrisic) strcat in vc 7.1 This is very easy to reproduce, just compile the sample code below (C or C++, it doesn't matter) with /O2 or /Ox option. Just adding a #pragma function(strcat) or compiling with /O1 or /Od removes the bug. I didn't try other version of Visual C++ than the one from Visual Studio.NET 2003 Entreprise Edition (french version, from MDSN subscription). Conditions to make this bug happen: 1) an inlined strcat (intrisic) and 2) first parameter of the inlined strcat is a not-inlinable function call returning the destination string pointer and 3) second parameter of the inlined strcat isn't a literal constant string (the inlined strcat must have to do an inlined strlen on it, the optimizer musn't be able to find a constant length). // BEGINNING OF SAMPLE #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <stdio.h> #include <string.h> // making the variables below global prevent optimizations that "hide" the bug char sz1[256] = "abc"; char sz2[] = ".ghi"; int main (int argc, char **argv) { // lstrcat (below) instead of a second strcat to prevent its inlinning, because // the lstrcat replaces a more complex function from a DLL of mine. // The code generated for the inlined strcat is realy very bad ! strcat(lstrcat(sz1, "def"), sz2); // sz1 is (far) large enough for that // should print "abcdef.ghi" but the lstrcat make an exception ! printf("%s\n", sz1); return 0; } // END OF SAMPLE The generated code (with my comments) is plainly wrong: _main PROC NEAR ; Line 15 ; THE INSTRUCTION BELOW APPEAR TOO SOON push OFFSET FLAT:??_C@_03BHEEIFFN@def?$AA@ ; push second parameter of lstrcat ("def") mov eax, OFFSET FLAT:_sz2 ; get second parameter of strcat ; THE INSTRUCTION BELOW APPEAR TOO SOON TOO push OFFSET FLAT:_sz1 ; push first parameter of lstrcat (sz1) ; inlined strlen(sz2) mov edx, eax $L20160: mov cl, BYTE PTR [eax] inc eax test cl, cl jne SHORT $L20160 ; OOPS, WRONG ! backup ebx/esi AFTER pushing parameters for lstrcat and before ; calling lstrcat ! push ebx push esi sub eax, edx ; end of the inlined strlen(sz2) ; STILL WRONG ! same reason as above push edi ;THIS (WAS ABOVE) SHOULD BE HERE: push OFFSET FLAT:??_C@_03BHEEIFFN@def?$AA@ mov esi, edx ; backup strlen(sz2) value ;THIS (WAS ABOVE) SHOULD BE HERE: push OFFSET FLAT:_sz1 mov ebx, eax ; backup sz2 pointer ; lstrcat below is COMPLETELY LOST with the random values pushed from edi and esi ! ; => exception call DWORD PTR __imp__lstrcatA@8 ; inlined strcat, skip existing chars in the (never) returned pointer to sz1 from lstrcat dec eax $L20161: mov cl, BYTE PTR [eax+1] inc eax test cl, cl jne SHORT $L20161 ; and copy sz2 at the end of sz1 mov ecx, ebx shr ecx, 2 mov edi, eax rep movsd mov ecx, ebx and ecx, 3 ; Line 17 push OFFSET FLAT:_sz1 push OFFSET FLAT:??_C@_03OFAPEBGM@?$CFs?6?$AA@ rep movsb call _printf add esp, 8 pop edi pop esi ; Line 18 xor eax, eax pop ebx ; Line 19 ret 0 _main ENDP Tag: linking into a shared library Tag: 228864
  - 19
    - convert character again Hi again, some day ago I asked how to convert a char and get its unicode value. The proposed solution was to call WideCharToMultiByte/MultiByteToWideChar Now, I'd rather not call the APIs directly, so I thought another solution: the following works perfectly. typedef wchar_t unicode_t; inline unicode_t widen(const char c) { return std::use_facet< std::ctype<wchar_t> > ( std::locale("") ).widen( c ); } My questions: 1) does it work by chance or... by design? is a wchar_t assumed large enough to hold a unicode value? It looks like there ARE some unicode chars whose code is > FFFF if there's a tight relation between wchar_t and unicode values, I think 'ctype::widen' may be assumed to convert to unicode, isn't it? 2) I read in MSDN there's a UTF-8 codepage named "65001". does it mean that std::use_facet< std::ctype<wchar_t> > ( std::locale(".65001") ).widen is able to read UTF-8 and convert to unicode? -- The set of solutions is never empty. Two solutions together form a new problem. -- Mycroft Holmes Tag: linking into a shared library Tag: 228857
  - 20
    - Create static library When creating a static library, VC++ 6 generates several .obj files and one .lib file. Besides adding the header file of the library into the client project, which other files should be also included into the client project so that the class defined in the static library can be used by the client? Thanks! Tag: linking into a shared library Tag: 228850
  - 21
    - cpp file lost During compiling or saving occsainally we get "filename.cpp does not exists. Do you want to overwrite with new one" In fact earlier saved copy is lost We have vc6.0 with sp 5 Tag: linking into a shared library Tag: 228849
  - 22
    - static global variable How many instance of the variable will be produced if I declared a static global variable in one header file, and two .c / .cpp files included the header file? Example as the following: <abc.h> static int abc = 1; ... <abc1.c> #include "abc.h" void ChkAbc1() { int* Addr = &abc; } ... <abc2.c> #include "abc.h" void ChkAbc2() { int* Addr = &abc; } ... One more question, if a static global variable declared in a .c / .cpp file, can I extern this variable on the header file? Example as the following: <abc.h> extern int abc; ... <abc.c> #include "abc.h" static int abc = 1; ... <main.c> #include "abc.h" void main() { int* Addr = &abc; } ... Thanks in advance, Best Regards, Elliott Tag: linking into a shared library Tag: 228840
  - 23
    - Visual C++ v1.52 Hi to all Can you help me find an installer for MS Visual C++ ver. 1.52, a download site or ftp.. Thanks in advance Allen Tag: linking into a shared library Tag: 228839
  - 24
    - Exporting VC char * to dll and call it back from VB I am converting 3 c functions into dll... as follow. char* _stdcall Dummy3(char *w1, char *w2) { return "w1"; } char _stdcall Dummy2() { return 'a'; } int _stdcall Dummy() { return 1234; } and 1 def file as follow. LIBRARY MYDLL EXPORTS Dummy @1 Dummy2 @2 Dummy3 @3 now i am using VB Declare Function Dum2 Lib "Testing.dll" Alias "Dummy2" () As String Declare Function Dum3 Lib "Testing.dll" Alias "Dummy3" (ByRef w1 As String, ByRef w2 As String) As Integer Declare Function Dum1 Lib "Testing.dll" Alias "Dummy" () As Integer Besides Dum1. All the other have failed and turn the VB down immediate. I have tried many method and done many research on web. Still cant found solution. What is happening? Thanks for help Tag: linking into a shared library Tag: 228838
  - 25
    - How to call constructor in the constructor ??? Hello, class A { public: A(); A(int a); } A::A() { //how to instance the A(1) here } A::A(int a) { cout << a; } As in the above code, how can I add a statement that can instance the A(int) in the A() constructor ??? Eric -- ========================== If you know what you are doing, it is not called RESEARCH! ========================== Tag: linking into a shared library Tag: 228837
- Next
  - 1
    - Thread communication in an NT service (ATL) Hi, I have written an NT service which uses multithreading. To be specific a single parent thread within the service spawns several child threads. The thing i want to do is to Post a message back to the parent Thread once the Child Thread finishes its processing. How can i post a message from the child thread to the parent thread especially when there are no Windows involved. Thanks in Advance, Srinivas Tag: linking into a shared library Tag: 228826
  - 2
    - Windows Installer object Hi How can I use Windows Installer object in my vc++ programs? I would like to have my program to use msiexec.exe to install a .msi package. I want to know more properties (like INSTALLDIR) of the MSI object, and if possible, some sample vc++ projects on MSI Thanks Peter Tag: linking into a shared library Tag: 228825
  - 3
    - Getting the version of the version of itself? Hello All I am creating a Win32-Dynamic-Linked Library VC+6 and I am trying to get the version of that dll from within it self. I have looked through the MSDN and couldn't find anything to do this for DLL's :( I know it can be done because I have done it before for an EXE but have forgotten. Does anyone know how to do this. Thanks in advance Paul Kirby Tag: linking into a shared library Tag: 228819
  - 4
    - using % to get 2 digit year Hi- I'm trying to use the mod operator to convert a 4 digit year to a 2 digit one. Here is what I'm doing: WORD shortYear = 2004%2000; the result is always 4 instead of the desired 04 I don't even know where to begin with this one. I googled pretty hard, but didn't find anything informative. Thanks for any help, Steve Tag: linking into a shared library Tag: 228814
  - 5
    - Splitter window cursor Hi, I need to hide the cursor that comes on splitter window Is there any way out Thanks Tag: linking into a shared library Tag: 228803
  - 6
    - Strange linker-problem (LNK1179) with a template-function Hello, I have defined a template-function in a header-file, which takes a pointer to a function and a parameter for that function as template-parameter (similiar to STL's for_each): template <class Fun, class Param> void for_each_radio(CSubWindows& subWindows, Fun fun, Param param) { for (int i = 0; i < subWindows.GetRadioCount(); ++i) { (subWindows.GetRadio(i)->*fun) (param); } } The template is 100% correct, I tested it...But the problem is, it only works if I use for_each_radio only once in my code. Else I get the linker error "LNK1179: Invalid or corrupt file: duplicate comdat ...for_each_radio..." It seems like the function will be instantiated twice with the same name because I don't use the /H and /Gy compiler options...How can I solve this horrible problem? of course there are include-guards in the header and I can't put in the code in a cpp (template!)... Tag: linking into a shared library Tag: 228797
  - 7
    - accessing the environment variables. How to access the environment variables in VC++ 6.0 console application ? Can anybody of you please give me an example for the same ? --Bansidhar Tag: linking into a shared library Tag: 228796
  - 8
    - stuck with what looks like a compiler bug in VS.NET 2003 vs VS.NET 2002 This is going to be a little vague I'm afraid as it's hard for me to provide explicit details without a vast quantity of extra information. I've recently changed compiler from .NET 2002 to .NET 2003. I have a fairly complicated application, which is an ISAPI extension that relies on several other rather large projects (Xalan, Xerces, ICU, boost). At some point, i'm at the bottom of a pretty deep call stack, and I throw an exception which travels up a lot of it. It seems that in one particular module, a couple of the functions don't manage to unwind the call stack properly -- it always crashes in either of these two functions during the unwind sequence. It's 100% reproducible with .NET 2003 and 100% not reproducible with .NET 2002, and depending on how I've been tinkering with the code, always crashes in the same place. I've tried sprinkling some extra try () { } catch (...) { throw; } blocks around various parts of these functions. The result is that I can make the problem go away, presumably by generating different unwind code. Oh, and this only happens with a release build. Normally I'd claim responsibility for mashing memory rather than pointing at the compiler, but in the case, the application (and those things that it relies on) have been proved to be very stable. I can also make this happen with a wide variety of initial conditions (effectively doing things that would drastically change the pattern of memory allocations up to that point), pageheap /full doesn't spot anything, and if I _don't_ throw the exception, then things all work as expected, even to the point of being able to conduct stress tests that previously passed. I realise that this is a bit of a long shot, but if anyone could offer any advice on what to try or look for to be certain as to what is going on that would be great. The application is open source, so if anyone has a great deal of spare time then it should be possible to recreate it locally. I'm out of ideas other than reading the compiler generated assembly at the moment (which isn't an easy task as my asm is a bit rusty these days). If it comes to it, I guess I'll have to drop back a compiler version, which would be a pity. Thanks, Mark Tag: linking into a shared library Tag: 228791
  - 9
    - is STL in msvc 6.0 (sp5) thread safe Hi there! We have app server written in C++ (stl is used a lot). And we use Visual C++ 6.0 compliler to built it. App is not stable when it is heavy loaded. It eather crashes or some static data in it becomes corrupted (so server stops doing his duties). We put some stuff from server into a test and with a lot of threads doing subset of usual servers work. And test crashes within minute or so. 40 threads are intensively doing allocation, populating and freeing containers such as std::map and std::set. Threads write only to their own (private) containers and there are some shared containers that are only read (via find method). So the question is: are stl containers such as std::map and std::set in VC6.0 thread safe in mentioned manner? And if they ar not - where to find the fix? --- With best wishes, Kirill. * ...chasing dreams... Tag: linking into a shared library Tag: 228788
  - 10
    - #pragma once Hi, Just out of curiosity, is using #pragma once equivalent to using #ifndef HEADER_H #define HEADER_H ... #endif ? Thanks, Nelson Tag: linking into a shared library Tag: 228784
  - 11
    - loading bitmaps from files Hello all, I'm writing a programme which needs to load bitmap files (*.bmp) from disk and then access the raw pixel data. I'd like an easy way to get that raw data as one plane, 32 bits per pixel. Right now I'm using LoadImage() to get the file and then two calls to GetDIBits(). The first call is to get the BITMAPINFO structure data so I know how big a buffer to allocate for the pixel data, and the second call actually gets the raw data. hbmp = (HBITMAP)::LoadImage(NULL, lpszFile, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); memset(&bmi, 0, sizeof(BITMAPINFO)); bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader); rc = ::GetDIBits(::GetDC(NULL), hbmp, 0, 0, NULL, &bmi, DIB_RGB_COLORS); m_pclrBits = (COLORREF *)calloc(bmi.bmiHeader.biWidth * bmi.bmiHeader.biHeight, sizeof(COLORREF)); rc = ::GetDIBits(::GetDC(NULL), hbmp, 0, bmi.bmiHeader.biHeight, m_pclrBits, &bmi, DIB_RGB_COLORS); Currently my programme just assumes that the raw pixel data will always be 32bpp with only one plane, but I just don't know if that is the case. ::GetDC(NULL) returns the root (desktop) window, which on my computer is 32bpp, but it might not be on a different machine and for all I know GetDIBits() might "translate" the raw data into however many bits/pixel and planes the root window is using. Would I be better off using ::GetBitmapBits even though the MSDN library says that is an obsolute function? Is there a way to ensure that the raw data is _always_ 32bpp and in a single plane? I'd rather not have to write code to take number of colour planes, bits per pixel and the colour table and translate "by hand" the raw data into 32bpp. Too many variations/combinations, too much wasting time. :-P I'd prefer to write all the code myself, rather than downloading some third-part toolkit which woud probably have more function than I need. Thanks in advance. P.s. Is there no function to write bitmap data to a *.bmp file? I found the basic structure of a *.bmp file in the MSDN library help files, so if I had to I could hack up a *.bmp file writer, but I'd rather not. Is there a SaveImage() companion to LoadImage() that I could just pass an HBITMAP handle to? -- Cory Albrecht http://cory.doesntexist.com/ "Star Trekkin' across the universe! Always going forward 'cause we can't find reverse!" Tag: linking into a shared library Tag: 228777
  - 12
    - unresolved external symbol __endthreadex and unresolved external symbol __beginthreadex I just don't get it. I punch in the code JUST as it is written and it = doesn't work: //*************************** // // Hello.h // //*************************** class CMyApp : public CWinApp { public: virtual BOOL InitInstance(); }; class CMainWindow : public CFrameWnd { public: CMainWindow(); protected: afx_msg void OnPaint(); DECLARE_MESSAGE_MAP() }; //************************** // // hello.cpp // //************************** #include <afxwin.h> #include "hello.h" CMyApp myApp; //////////////////////////// // CMyApp member functions BOOL CMyApp::InitInstance() { m_pMainWnd =3D new CMainWindow; m_pMainWnd->ShowWindow(m_nCmdShow); m_pMainWnd->UpdateWindow(); return TRUE; } //////////////////////////// // CMainWindow message map and member functions BEGIN_MESSAGE_MAP(CMainWindow, CFrameWnd) ON_WM_PAINT() END_MESSAGE_MAP() CMainWindow::CMainWindow() { Create(NULL, "The Hello Application"); } void CMainWindow::OnPaint() { CPaintDC dc(this); CRect rect; GetClientRect(&rect); dc.DrawText("Hello, MFC", -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); } --------------------Configuration: hello95 - Win32 = Debug-------------------- Compiling... hello.cpp Linking... nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol = __endthreadex nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol = __beginthreadex Debug/hello95.exe : fatal error LNK1120: 2 unresolved externals Error executing link.exe. The project was a Win32 Application. What have I done wrong? There is = no indication that anything else is necessary but to me it looks like = there are some includes not included or some libs not libed that should = be included and\or libed. --=20 George Hester __________________________________ Tag: linking into a shared library Tag: 228775
  - 13
    - VC SDK I'm using VC 6 with latest Service pack (6). > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/getting_the_system_version.asp I have been working with the above sample to display which OS the program is running on. Prior to updating the SDK and SP the code above worked flawlessly, Since updating, I get errors like > c:\working\ostest\hello\hello.cpp(59) : error C2039: 'wProductType' : is not a member of '_OSVERSIONINFOEXA' > c:\working\ostest\hello\hello.cpp(63) : error C2039: 'wSuiteMask' : is not a member of '_OSVERSIONINFOEXA' > c:\working\ostest\hello\hello.cpp(63) : error C2065: 'VER_SUITE_PERSONAL' : undeclared identifier According to MSDN these items are declared in Winbase.h. My include file for Winbase.h does not have these declarations. Has there been a change to this include file that your online sample does not address? I have even uninstalled everything and reinstalled, applying the Service Pack and Updating the SDK's. Is there an update that I missed? -- Regards, Steve Topilnycky Top Cat Computing http://www.topcatcomputing.com/ Tag: linking into a shared library Tag: 228769
  - 14
    - Writing a C++ program to send an email Does anyone know of any API or COM object that allows you to send and email from a C++ program Tag: linking into a shared library Tag: 228768
  - 15
    - max speed compilation failed I have a simpe win32 dll. when I make an optimization/max speed compilation, it always says: Compiling... Command line error D2016 : '/ZI' and '/O2' command-line options are incompatible if I use other options in optimization, it can compile. I wonder if I remove /ZI /O2, is it still in max speed ? or how can I get a max speed compilation ? thanks. /* Call Library source file */ #include "extcode.h" #include <ole2.h> #include <stdio.h> #include <conio.h> #include <winbase.h> void GetSeeThrough(unsigned char *aLine,int *seeThrough,int aLMax,int aLMin) { register i,j,k; for( j=0;j<256;j++) { //-----------added--below--------- if(j<=aLMin) { seeThrough[j]=150;//srcImage->Width; } else if(j>=aLMax) { seeThrough[j]=0; } else { k=0; for(i=0;i<150;i++)//srcImage->Width { if(j<=aLine[i])k++; } seeThrough[j]=k; } } } _declspec(dllexport) void Go(long count, long *time); _declspec(dllexport) void Go(long count, long *time) { int seeThrough[256]; unsigned char aLine[150]; int i; int tt1,tt2,tt3; *time=count*4; tt1=GetTickCount(); for(i=0;i<150;i++) { aLine[i]=i; } for(i=0;i<count;i++) { GetSeeThrough(aLine,seeThrough,255,0); } tt2=GetTickCount(); tt3=tt2-tt1; //milliseconds *time=tt3; } Tag: linking into a shared library Tag: 228760
  - 16
    - Sharing data between apps Greetings, I know this has come up before, but I never needed to know the details. Well now I do. How do it use the CreateFile() API to create a memory-only data block that I can use to share data between two or more applications? If someone could point me to a good reference that would be great. Thanks Murrgon Tag: linking into a shared library Tag: 228759
  - 17
    - typedef struct question i asked this before and forgot the answer: i am doing this: typedef struct { }MYSTRUCT and inside the struct i want to declare a pointer to a MYSTRUCT .... but the compiler doesn't like it, what do i need to do before hand again? thanks Tag: linking into a shared library Tag: 228758
  - 18
    - CopyFile() very slow What is the best method (read fastest) of copying a file I'm using CopyFile() but it is extremely slow. Below i a small console app that illustrates this. Just replac the hardcoded file paths with the path to a file ~10MB Compile and run the program and see the reported times Then go to Windows Explorer and copy the same file My results were about 7 secs using CopyFile() an instantaneous through Explorer #include <windows.h #include <stdio.h #include <string.h #include <time.h #include <conio.h int main(int argc, char* argv[] char ampm[] = "AM" time_t ltime struct tm *today time( &ltime ) today = localtime( &ltime ) if( today->tm_hour > 12 strcpy( ampm, "PM" ) today->tm_hour -= 12 if( today->tm_hour == 0 ) /* Adjust if midnight hour. * today->tm_hour = 12 printf( "Begin time:\t\t\t\t%.8s %s\n" asctime( today ) + 11, ampm ) CopyFile("c:\\temp\\big_file.zip", "c:\\temp\\big_file2.zip", 0) time( &ltime ) today = localtime( &ltime ) printf( "End time:\t\t\t\t%.8s %s\n" asctime( today ) + 11, ampm ) int ch printf("\n\tPress any key to exit...\n") ch = getch() return 0 Thanks Drew Tag: linking into a shared library Tag: 228755
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    - Determining System Boot/Login Time Is there a reasonably simple way to determine the date and time at which the system booted and/or when the current user logged in? Tag: linking into a shared library Tag: 228749
  - 20
    - Extracting data from a VARIANT in C/C++ I am writing an add-in for an application. The add-in is a DLL written in C++. The parent application passes various parameters to a function in the DLL. On of these function parameters is type "_variant_t". I need to extract the string value from this _variant_t. I'm an old C programmer from way back, but I'm not much of a C++ programmer, so I am, as yet, unable to deduce the means fo doing this from the header files. Is there an MFC or Win32 library or class that provides the means of extracting specific data types from a _variant_t? Thanks in advance for any help. Steve Tag: linking into a shared library Tag: 228742
  - 21
    - WS_SYSMENU without CLOSE BOX Hi there, I'm trying to create a new window which only has a Minimize Box and Maximize Box. I need to put WS_SYSMENU to show the Min and Max box, but the Close Box also shows up. Is there any way to create a window with just a min and max box without CLOSE box? Thanks, Robert Tag: linking into a shared library Tag: 228741
  - 22
    - New[] and delete Hi, A Quick Question please .... If I use new[1] can I use delete, instead of delete[] ? I mean when I use, " Type_AddrObj lpAddress = new Type_AddrObj [1] ;" Then which is correct ? a) delete[] lpAddress ; b) delete lpAddress ; Since the size of array is always specified as 1. Thanks. Vipul Pathak ; Tag: linking into a shared library Tag: 228735
  - 23
    - Disabled CTreeControl question Hello! If I select an item in a tree - and disable the whole tree - all the items in that tree is "grayed". How can I avoid that? This is how I would like things to work - only one item should be grayed - and I should not be able to click on this tree. -- - Lars Tag: linking into a shared library Tag: 228733
  - 24
    - Compilation error with std list class Hi All, When I try to include the header for a class that has a member list<int> m_list; I get over 100 errors of the nature: "c:\program files\microsoft visual studio\vc98\include\functional(16) : error C2143: syntax error : missing '{' before '<'" Here is the complete header which I have cut down to the minimum in order to show the error: #include <list> using namespace std; class CMyContainer { public: CMyContainer(); int GetSize(); private: list<int> m_list; }; Any ideas what is wrong? Cheers, Rob Tag: linking into a shared library Tag: 228721
  - 25
    - How to send Email in VC Applications? hi, What is the best way to send Email in VC applications? Thanks, Behzad Tag: linking into a shared library Tag: 228718

Hello everybody

I have a program which has 12 workspaces and each of them after
successful compilation can build a seperate *.lib file. The
documentation of this program says

'once all these files are compiled, link them into a library, or a
shared library, or directly into your program.'

I am not sure what has to be done and how. Can someone please tell me
what is required to be done here? Should a single *.lib has to be
created from all these 12 *.lib? How it can be done? What could
'shared library' mean here?

thanks for any help.

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Re: linking into a shared library by William

William
Sun Apr 25 13:49:03 CDT 2004

"seia0106" <miahmed67@yahoo.com> wrote in message
news:4fe296bd.0404250710.6d584aa5@posting.google.com...
> I have a program which has 12 workspaces and each of them after
> successful compilation can build a seperate *.lib file. The
> documentation of this program says
>
> 'once all these files are compiled, link them into a library, or a
> shared library, or directly into your program.'
>
> I am not sure what has to be done and how. Can someone please tell me
> what is required to be done here? Should a single *.lib has to be
> created from all these 12 *.lib? How it can be done? What could
> 'shared library' mean here?

It's cross-platform speak. What are called shareables or shared-libraries
(on VAX/VMS, and the 'nix, 'nux, and 'pux o/s's) are called Dynamic Link
Libraries (DLLs) on Win32.

The good thing about such 'shared' components is that they can be changed
without rebuilding the executable that uses them. That's also the bad thing
about them when a change to the callee necessitates a change to the caller.
And the fact that they are external can result in extra fun in one is moved
or deleted.

In short, you can take the advice or not. If you like you can simply add all
12 libraries to a project which makes use of them and link the whole thing
into one executable.

Regards,
Will

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