help with c++

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- Previous
  - 1
    - "Double dispatching" of operator-> Consider the following program: // P is designed to be some proxy for T template<class T> struct P { T* operator ->(); }; // PP<T> is designed to be some proxy for the proxy P<T> template<class T> struct PP { P<T> operator ->(); }; // Any old class class C { int f(); }; int main(int, char**) { PP<C> c; return c->f(); } This compiles successfully on MSVC6, MSVC8 (beta 2) and Comeau Online. How is C::f() found? (it is indeed being found, as can be confirmed by attempting to link it.) By what rule does "c->f()" get interpreted as "c.operator->().operator->().f()"? Usually one cannot do more than one "implicit conversion" in one go. Is there a special rule, or indeed a general rule that I am missing here? One can seemingly extend the example to further layers of indirection, e.g. template<class T> struct PPP { PP<T> operator ->(); }; template<class T> struct PPPP { PPP<T> operator ->(); }; then change PP<C> in main to be PPPP<C>. Tag: help with c++ Tag: 259273
  - 2
    - message issue i'm trying to make the screen refresh continuously while still handling windows messages correctly. here's what i have: #define MYMSG 19000 PostMessage(hWnd, MYMSG, 0, 0); while (!bQuit) { if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) { TranslateMessage (&msg); DispatchMessage (&msg); } } ... case MYMSG: boardgraphics.drawboard(board); SwapBuffers (hDC); Sleep(10); PostMessage(hWnd, MYMSG, 0, 0); return 0; my understanding is that it should post MYMSG at the end of the queue, and that it will be read after any keyboard and mouse messages. however, the window doesn't seem to be handling keyboard and mouse messages. any ideas? Tag: help with c++ Tag: 259266
  - 3
    - Timers Anyone know what happens if you use SetTimer to create a timer that can't process the WM_TIMER message in time? For instance, let's say you have it called 100 times a second to redraw the screen, but you run it on a slow computer. What would happen? Tag: help with c++ Tag: 259264
  - 4
    - Help with strings in MS VC++ Express I need to know how to get from one comma delimited text string to many strings. from this: main_string = "onE,Two,Three , fouR,five, six " to these: string1 = "one" string2 = "two" string3 = "three" string4 = "four" string5 = "five" string6 = "six" the white space needs to be removed and the case needs to be all upper or lower. The result needs to be strings and not pointers or addresses in memory so I can test: string test = "three"; if (three == "three") some getlines will only have two strings some may have up to 10 Please help with examples, you input with exact syntax is greatly appreciated I have been struggling with not using pointers but every time I end up using them. Thanks in advance Tag: help with c++ Tag: 259263
  - 5
    - C# Is this the correct forum for Visual C#? Tag: help with c++ Tag: 259258
  - 6
    - menu bar i have this opengl game i'm working on, and when i click the menu bar at the top of the window, the game pauses. anyone know why this is? does the peekmessage function get blocked when you click the menu bar? i'm using a standard loop like this: if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) { TranslateMessage (&msg); DispatchMessage (&msg); } else dosomeopengldrawing(); Tag: help with c++ Tag: 259251
  - 7
    - Emulating AtlWaitWithMessageLoop? Can it be done? I am not familiar enough with the queue servicing functions. They all seem to have little catch-22's that make me hesitant to fill in the empty "else" clause below. BOOL MyWaitWithMessageLoop(HANDLE hEvent) { MSG msg; DWORD dwWaitResult; while ( TRUE ) { dwWaitResult = MsgWaitForMultipleObjects(1, &hEvent, FALSE, INFINITE, QS_SENDMESSAGE | QS_POSTMESSAGE); if ( dwWaitResult == WAIT_OBJECT_0 ) return TRUE; else { /* empty the queue; check for WM_QUIT */ } } } For example, I am tempted to say while ( PeekMessage(&msg, hWndMe, 0, 0, TRUE) { if ( msg.message == WM_QUIT ) return FALSE; DispatchMessage(&msg); } but I read that PeekMessage() **automatically** dispatches 'sent' messages. I also read, of GetQueueStatus(), that "The presence of a QS_ flag in the return value does not guarantee that a subsequent call to the GetMessage or PeekMessage function will return a message" and that makes me hesitant to use GetQueueStatus(). How can I finish off this emulation of AtlWaitWithMessageLoop()? Thanks. Note that my window needn't worry about any input, timers, or anything that deals with it's being shown (it's never shown). -- - Vince Tag: help with c++ Tag: 259247
  - 8
    - How do I put the date time into a DWORD? I have the system time but I do not know how to put the various pieces (st.wDay, st.wMonth, st.wYear, st.wHour, st.wMinute, st.wSecond) into a DWORD. SYSTEMTIME st; GetSystemTime(&st); Thank you in advance. Tag: help with c++ Tag: 259240
  - 9
    - Which version VS5: Standard or Pro? Which version is for me? standard or pro? What I miss in the Express ver is 1) ATL support 2) resource editing not supported 3) templates for creating COM object dlls. thanks Tag: help with c++ Tag: 259235
  - 10
    - GetOleDbSchemaTable VS C++ 2005 In Visual Studio 2003 C++ GetOleDbSchemaTable worked so: DataTable* GetTables(OleDbConnection* conn) { conn->Open(); Object* restrictions[] = {0, 0, 0, S"TABLE"}; DataTable* schemaTable = conn->GetOleDbSchemaTable(OleDbSchemaGuid::Tables, restrictions); conn->Close(); return schemaTable; }; How to make this in Visual Studio C++ 2005 ?? Help me !! Hideen ;-) Tag: help with c++ Tag: 259233
  - 11
    - Do specified libraries always get linked? VC++ 7.1 In a project's property pages, do all libs specified in Linker/Input actually get linked into the app in all cases, or do only those that are actually used get linked? Thanks, Dave Tag: help with c++ Tag: 259230
  - 12
    - VC2005 and TR1? Does VC2005 implement TR1? Tag: help with c++ Tag: 259227
  - 13
    - Adjusting printing settings in MFC Greetings! I have an application where a vector font is printed. There are a few parameters (line width and colour, # of rows and columns) that can be adjusted for printing. What I wonder is how I would best integrate it into the printing framework of an MFC SDI application. In particular, I wonder about the following things: - There is a print setup dialog, but that seems to only be a printer setup dialog - is there a way I can add controls to influence the generated layout? - Also, using the print preview, is there a way to either start the print setup dialog or a custom setup dialog so that you can quicker see the effects of your changes? - Lastly, though not that important, why are there only three zoom levels in the preview? I observe that anything between one and ten pixels shows up the same in the preview, but different on the printer - I guess one could see the differences when zooming in closer ... is there a way to? cheers Uli Tag: help with c++ Tag: 259208
  - 14
    - how to view the type of catch all (...) exception hi all experts, i have in my code a try block and it is throwing some exception. i am catching that exception in the catch(...) block . i don't know what type of exception is being thrown and being caught in that catch(...) block. is there any way to know the type of exception that is being thrown in the catch(...) block ??? thanks a lot ravinder Tag: help with c++ Tag: 259194
  - 15
    - Linking problem : I am using PDH ..objects... I have simply copy a code from msdn and complile ...result is no error.. then tried to build it but ...getting problem..error messages are shown below- --------------------Configuration: testMain - Win32 Debug-------------------- Linking... testMain.obj : error LNK2001: unresolved external symbol _PdhEnumObjectItemsA@36 Debug/testMain.exe : fatal error LNK1120: 1 unresolved externals Error executing link.exe. ....................... Help required.. Tag: help with c++ Tag: 259192
  - 16
    - substitute of __noop in VC6 Hello, What is the substitute of __noop (VC7) in VC6? Thanks, Piyush Tag: help with c++ Tag: 259191
  - 17
    - Slight Beginner Needs Some Help (Please!) The original post is here: http://groups.google.com/group/microsoft.public.vc/browse_thread/thread/8f278d33ed56f696/f42da5779bede6a6#f42da5779bede6a6 ------ I Have This: HRESULT CReader::GetBytes(BYTE** outBuffer, DWORD* cbSize) { if(outBuffer == NULL) { return E_INVALIDARG; } //m_size is an Internal DWORD which is a member of CReader //and is set to some value elsewhere in the class //m_internalBuffer is an Internal BYTE* pointer which is a member of CReader //and is filled with data elsewhere in the class *outBuffer = new BYTE(m_size); CopyMemory(*outBuffer, m_internalBuffer, m_size); return S_OK; } This crashes the program. I think it's the pointers problem here, but im not sure I cannot simply return a reference because the lifetime of m_internalBuffer is not guaranteed. Thanks in advance Tag: help with c++ Tag: 259189
  - 18
    - Slight Beginner Needs Some Help (Please!) The original post is here: http://groups.google.com/group/microsoft.public.vc/browse_thread/thread/8f278d33ed56f696/f42da5779bede6a6#f42da5779bede6a6 But this group is much more appropriate ------ I Have This: HRESULT CReader::GetBytes(BYTE** outBuffer, DWORD* cbSize) { if(outBuffer == NULL) { return E_INVALIDARG; } //m_size is an Internal DWORD which is a member of CReader //and is set to some value elsewhere in the class //m_internalBuffer is an Internal BYTE* pointer which is a member of CReader //and is filled with data elsewhere in the class *outBuffer = new BYTE(m_size); CopyMemory(*outBuffer, m_internalBuffer, m_size); return S_OK; } This crashes the program. I think it's the pointers problem here, but im not sure I cannot simply return a reference because the lifetime of m_internalBuffer is not guaranteed. Thanks in advance Tag: help with c++ Tag: 259188
  - 19
    - LPCTSTR related problems if we have : LPCTSTR index1; index1 = L"name"; // is correct? // if not , please give an example of a correct way if that's wrong. Tag: help with c++ Tag: 259179
  - 20
    - Icon in a child window! Hello everyone, This question requires you to know "Checker3" program from Petzold's book. All help is appreciated! I started chapter 9 (Child Window controls) of Petzold's book and as I started reading this chapter, it started to reference stuff we did in chapter 7, more particularly the "Checker3" program. So I immediately, stopped what I was reading and went back to review "Checker3" so I would be up to speed with the particularities of this sample program. All is OKAY... But you know silly me ! I always have to dig further than I have to. For the ones that are familliar with this example!!!! I am curious to know, what if we wanted to have a title bar and an icon in every one of the 25 child windows of the checker board. So first of all I tried to add the following line just before we would register the second wndClass window: wndclass.style = CS_HREDRAW |CS_VREDRAW; But then I thought to myself, this doesn't make sence, since this only allows re-drawing when vertical or horizontal resizes are done. So I commented out that line. Then I changed the following line just before we would register the second wndClass window from : wndclass.hIcon = NULL; to wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION); But that didn't help either. It clearly states on P.301 of Charles Petzold's book where he talks about the 4 fields that are required in the wndClass structure for registering the Checker3_Child class. The field in question is the hIcon field and he says: "The hIcon field is set to NULL because child windows such as the ones in Checker3 do not required Icons" However, what if we would want them to require Icons, is there something to set in CreateWindow or in wndClass or is it just impossible to have Icons or title bars in child windows ? I have read up on the CreateWindow function which for the 3rd parameter (dwStyle)states: "[in] Specifies the style of the window being created. This parameter can be a combination of window styles, plus the control styles indicated in the Remarks section." I looked at the available control styles... I found they don't really apply to what I am trying to do! However I did not try to experiment with them. If you need to see the whole program, just let me know and I will post it. -- Best regards Robert Tag: help with c++ Tag: 259175
  - 21
    - process Id and HINSTANCE...what is the relation betweeen them? Hello Alll, I am learning windows programming and getting confused more and more.. here is my latest confusion... What is the relation between processId (which we come to know from the task manager) and hInstance (which is one of the parameter passed in the winmain function) of a program? Or there isn't any relation at all? if yes..why? as both give us the unique number related to a running program.. Thanks and Regards, Yogesh Joshi Tag: help with c++ Tag: 259164
  - 22
    - link errors in using zlib hello, all When I compiled a sample which shows how to use zlib and is provided by the official web site in VC7, the following errors occured. Linking... MSVCRT.lib(MSVCR71.dll) : error LNK2005: _malloc already defined in LIBC.lib(malloc.obj) MSVCRT.lib(MSVCR71.dll) : error LNK2005: _free already defined in LIBC.lib(free.obj) LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library Release/zlib_test1.exe : fatal error LNK1169: one or more multiply defined symbols found zlib just provide VC6 project of zlib, but I compliled it with VC7 successfully. I know msvcrt.lib and libc.lib are both provieded by VC. I wanna know what might raise the above errors generally. THANKS! Tag: help with c++ Tag: 259155
  - 23
    - Final and Cieled and nothing in C++ Has the fact that both Java and C# are garbage collected, and C++ in not, anything to do with the fact that there is no language item to prevent a class from being inherired from? I once read that Java and C# implement this feature for preformance, but the C++ creators said it was not worse the effort. So because Java and C# are garbage collected, in their case is it worse the effort? What is the connection? Tag: help with c++ Tag: 259153
  - 24
    - What text will pass the test: IS_TEXT_UNICODE_ASCII16 I can't find any. #define UNICODE #include <windows.h> #include <stdio.h> INT wmain ( INT argc, WCHAR *argv[] ) { WCHAR szStr[] = L"This is some text."; INT iTest = IS_TEXT_UNICODE_ASCII16; IsTextUnicode(szStr, lstrlen(szStr)*sizeof(WCHAR), &iTest); if ( iTest & IS_TEXT_UNICODE_ASCII16) wprintf(L"Passed the test.\r\n"); else wprintf(L"Failed the test.\r\n"); return 0; } -- - Vince Tag: help with c++ Tag: 259151
  - 25
    - REQUEST TO SOLVE MY PROBLEM IN VC++ Hellosir, Iamvijayprasadreddy, I have an MDI application in vc++. In the view i have a splitter wnd in which the top view is CScrollView and he bottom view is CRichEditViw. In the top view i can draw the lines which represent Music. we can change the size of the lines by providing a zoom option with 10 to 200 % in a combobox in the Toolbar. for this i want to implement a feature "Fit Window" which fits the drawing to the visible area only. Please provide me your ideas and help me. please do reply me as soon as possible i will be waiting for your reply thanking you yours sincierly vijayprasadreddy.m Tag: help with c++ Tag: 259150
- Next
  - 1
    - REQUEST TO SOLVE MY PROBLEM IN VC++ I have an MDI application in vc++. In the view i have a splitter wnd in which the top view is CScrollView and he bottom view is CRichEditViw. In the top view i can draw the lines which represent Music. we can change the size of the lines by providing a zoom option with 10 to 200 % in a combobox in the Toolbar. for this i want to implement a feature "Fit Window" which fits the drawing to the visible area only. Please provide me your ideas and help me. Tag: help with c++ Tag: 259149
  - 2
    - REQUEST TO SOLVE MY PROBLEM IN VC++ I have an MDI application in vc++. In the view i have a splitter wnd in which the top view is CScrollView and he bottom view is CRichEditViw. In the top view i can draw the lines which represent Music. we can change the size of the lines by providing a zoom option with 10 to 200 % in a combobox in the Toolbar. for this i want to implement a feature "Fit Window" which fits the drawing to the visible area only. Please provide me your ideas and help me. Tag: help with c++ Tag: 259148
  - 3
    - Can I get both 'Command Window" and "Win32 Window" I am coding a win32 project, so the .exe have a win32 window but i found it difficult to debug when I want to watch each step of the program, most of then are print to "Command Window" by 'printf' Can I have both win32 and command window, Mingw could do it but it can not compile some vc8 project, Any one knows how to make it in M$ vc, It will be very helpful Tag: help with c++ Tag: 259144
  - 4
    - Iterator problem in VC8 calling clear() on a iterator causes a access violation in my app. It was compiled with VC8 and used to work in VC6. It only crashed in the debug version, release version seams to work. It crashes in the list::_Orphan_ptr function ("list" file) --- addionally I get many warning C4996, but they seam to relate to the STD library itself. See below: c:\programme\microsoft visual studio 8\vc\include\iosfwd(582) : warning C4996: 'std::_Traits_helper::copy_s' was declared deprecated c:\programme\microsoft visual studio 8\vc\include\iosfwd(597) : see declaration of 'std::_Traits_helper::copy_s' Message: 'You have used a std:: construct that is not safe. See documentation on how to use the Safe Standard C++ Library' c:\programme\microsoft visual studio 8\vc\include\xstring(2035) : see reference to function template instantiation 'std::char_traits<unsigned char>::char_type *std::_Traits_helper::copy_s<_Traits>(std::char_traits<unsigned char>::char_type *,size_t,const std::char_traits<unsigned char>::char_type *,size_t)' being compiled with [ _Traits=std::char_traits<unsigned char> ] c:\programme\microsoft visual studio 8\vc\include\xstring(2028) : while compiling class template member function 'void std::basic_string<_Elem>::_Tidy(bool,unsigned int)' with [ _Elem=unsigned char ] - --- thanks in advance Tag: help with c++ Tag: 259137
  - 5
    - Prog. doesn't do waht its supposed to. Hi, I hate when I understand a piece of code and I know what its supposed to do, but then when I run it, there is a mysterious flaw, where to look now??????? Anyways this is the problem: I am finishing up chapter 8 of Petzold's book (Timers) and I seem to be stuck at the last program sample called "WhatClr" on page 352. I have looked it over for typo's but don't see anything wrong. I undertsand the logic but the program doesn't do what it claims. Its simply supposed to display the color of the current pixel underneath my pointer or as he says it "the pixel currently underneath the hot point of the mouse cursor." I don't know what he means by "Hot point" I guess he means the tip of my pointer? Anyhow if anyone is familliar with this code fragment, I would appreciate you taking a quick look at it. Thanks for your help! Here is the code. ================================================= #include <windows.h> #define ID_TIMER 1 void FindWindowSize (int *, int *); LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInnstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("WhatClr"); HWND hwnd; int cxWindow, cyWindow; MSG msg; WNDCLASS wndclass; wndclass.style = CS_HREDRAW |CS_VREDRAW; wndclass.lpfnWndProc= WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor (NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("xxx"),szAppName, MB_ICONERROR); return 0; } FindWindowSize(&cxWindow,&cyWindow); hwnd = CreateWindow (szAppName, TEXT ("WhatColor"), WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU |WS_BORDER, CW_USEDEFAULT,CW_USEDEFAULT, cxWindow,cyWindow, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, iCmdShow); UpdateWindow (hwnd); while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (int) msg.wParam; } void FindWindowSize(int * pcxWindow, int * pcyWindow) { HDC hdcScreen; TEXTMETRIC tm; hdcScreen = CreateIC(TEXT("DISPLAY"), NULL,NULL,NULL); GetTextMetrics(hdcScreen, &tm); DeleteDC(hdcScreen); * pcxWindow = 2 * GetSystemMetrics(SM_CXBORDER) + 12 * tm.tmAveCharWidth; * pcyWindow = 2 * GetSystemMetrics(SM_CXBORDER) + GetSystemMetrics(SM_CYCAPTION) + 12 * tm.tmHeight; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message,WPARAM wParam, LPARAM lParam) { static COLORREF cr,crLast; static HDC hdcScreen; HDC hdc; PAINTSTRUCT ps; POINT pt; RECT rc; TCHAR szBuffer[16]; switch(message) { case WM_CREATE: hdcScreen = CreateIC(TEXT("DISPLAY"), NULL,NULL,NULL); SetTimer(hwnd,ID_TIMER,100,NULL); return 0; case WM_TIMER: GetCursorPos(&pt); cr = GetPixel(hdcScreen,pt.x,pt.y); SetPixel(hdcScreen,pt.x,pt.y,0); if (cr != crLast) { crLast = cr; InvalidateRect(hwnd,NULL,FALSE); } return 0; case WM_PAINT: hdc = BeginPaint(hwnd,&ps); GetClientRect(hwnd,&rc); wsprintf(szBuffer, TEXT(" %02X %02X %02X "), GetRValue(cr), GetGValue(cr), GetBValue(cr)); DrawText(hdc,szBuffer, -1, &rc, DT_SINGLELINE | DT_CENTER | DT_VCENTER); EndPaint(hwnd,&ps); return 0; case WM_DESTROY: DeleteDC(hdcScreen); KillTimer(hwnd,ID_TIMER); PostQuitMessage(0); return 0; } return DefWindowProc(hwnd,message,wParam,lParam); } -- Best regards Robert Tag: help with c++ Tag: 259136
  - 6
    - request to solve my problem I have an MDI application in vc++. In the view i have a splitter wnd in which the top view is CScrollView and he bottom view is CRichEditViw. In the top view i can draw the lines which represent Music. we can change the size of the lines by providing a zoom option with 10 to 200 % in a combobox in the Toolbar. for this i want to implement a feature "Fit Window" which fits the drawing to the visible area only. Please provide me your ideas and help me. i will be waiting for ypur re[ly.hope you will respond to me soon Tag: help with c++ Tag: 259130
  - 7
    - Why should I code in header file [Visual studio C++ 2005]? Hi, In VC++.Net 2005 visual studio, if I create a new winform drag and drop a button, then double click it to write click event code, then it auto generates the template code for the event in Form1.h file rather than Form1.cpp file. This behaviour is against standard C++ coding standards, where my header file is supposed to just have declarations. I read in other topics that this is due to C# association of single file concept with the winform. Can someone (from MS or MS experts) explain why is this done? and how can I avoid it to generate template code in header file and write my code in .cpp file? Thanks and Regards, Shil Tag: help with c++ Tag: 259127
  - 8
    - alt tab mystery i created a reversi game at http://www.coolgroups.com/reversigame2/ in C++. i noticed that, if i alt tab away from it in windows xp and alt tab back, the game screen is blank. however, if i do this on my win 2k system, the game screen shows up correctly. i'm using opengl and a separate thread for the graphics. any ideas why this might happen? btw, the game installs the source too. thanks. Tag: help with c++ Tag: 259123
  - 9
    - Windows Service : Dependencies Hi All, I have one service that depend of SQL Service, and this servive(my) can start if only the SQS is running, but this service is located in other machine; Have any way to specify this? Thanks Tag: help with c++ Tag: 259118
  - 10
    - Static Variables in C++ Hi, I have declared a static array in main and want to use it in a function in another file.The function will be called from main itself.How should I proceed with it?Will passing the array as pointer while calling the function from the main be fine?It will be great if you can explain the scope of the static array that is declared in main. --Thanks!! Tag: help with c++ Tag: 259116
  - 11
    - linker error Hello, I've made a static lib using VSC++. I'm trying to call the library routine in another project that uses DDK compiler and I'm getting the following error advanced.obj : error LNK2019: unresolved external symbol "int __stdcall SaveXml(struct _XmlPortParams *)" (?SaveXml@@YGHPAU_XmlPortParams@@@Z) referenced in function "int __stdcall AdvancedDlgProc(struct HWND__ *,unsigned int,unsigned int,long)" (?AdvancedDlgProc@@YGHPAUHWND__@@IIJ@Z) objchk_w2K_x86\i386\Ctibhnp.dll : fatal error LNK1120: 1 unresolved externals I've even declared the function in librarry as __stdcall but that also does not solve the problem. Any idea how to resolve this? Thanks, Hablu Tag: help with c++ Tag: 259108
  - 12
    - Help converting malloc to new Hi, I am new to c++ and I am converting a c program to c++. I changed malloc call to new and I am getting an exception violation. Here is the relevant piece of code. Compiler vc++ 7.0 (.Net 2003) SQLINTEGER nCols; SQLINTEGER cbColDataLength; PBYTE* pColumnData = NULL; === C style ==== pColumnData = (PBYTE*) malloc(nCols * sizeof(PBYTE)); pIndicators = malloc(nCols * sizeof(SQLINTEGER)); pColumnData[nCol] = (PBYTE) malloc(cbColDataLength) === C++ style ==== pColumnData = new PBYTE [nCols * sizeof(PBYTE)]; pIndicators = new SQLINTEGER [nCols * sizeof(SQLINTEGER)]; pColumnData[nCol] = *(new PBYTE [cbColDataLength]) I tried using my logical understanding of pointers but the compiler kept throwing me out. So looking at the compiler messsages I got it to compile by using the above syntax. Please help me in figuring out if this is correct. Thanks Prahalad Tag: help with c++ Tag: 259090
  - 13
    - IAsyncResult and AsyncResult anyone know the difference between the 2? Tag: help with c++ Tag: 259088
  - 14
    - Creating folder, file - writing to file I need to create a folder on "C:\", then create a text file on "C:\\NewFolder", then write data to my text file. Is there a way to do this in this environment (or perhaps a better way in standard C)? Thanks ! Tag: help with c++ Tag: 259080
  - 15
    - parameter passing between VC and VB Google is not my friend tonight. Or I am just being too impatient. Anyway can someone point me to relevant MSDN articles (or other up-to-date technical info) regarding parameter passing between C DLLs and VB programs. I haven't done that since the 16-bits days (VC1.5 & VB3). I hope to be able to use my old, trusty VC6, and the client would be VB.net. Not VB6, does that make a difference? I suppose I am really asking if VB.net is allowed to call unmanaged code. I seem to recall some special header was needed in order to be able to access (and return) VB strings from C. Has accessing non-Unicode C-style (zero-terminated) strings gotten any easier from the VB side, these last 10 years or so :-) Thanks in advance for pointers and hints, Bernard. (yes, this is cross-posted to vc.lang and vb.winapi; apologies to whomever it irks ;-) Tag: help with c++ Tag: 259079
  - 16
    - __imp_ Linking question I've looked around and tried several suggestions on this topic, but to no avail. The program is C++ and getting LNK2019 error when trying to link in C functions from a DLL. I'm using eVc++4.0. The header file of the DLL looks like this. #define VEOCAMAPI_API __declspec(dllimport) extern "C"{ VEOCAMAPI_API HRESULT CamOpen(HANDLE* phCam); } I did a DUMPBIN /imports /symbols, and found this line: 0AD 00000000 UNDEF notype () External | __imp__CamOpen So the __imp__ is being added by the __declspec(dllimport) A DUMPBIN /exports /symbols on the library shows this line 5 4 00006D04 CamOpen So the linker says: error LNK2019: unresolved external symbol __imp__CamOpen referenced in function If I remove the VEOCAMAPI, The linker gives this error error LNK2019: unresolved external symbol _CamOpen referenced in function So how do I deal with the extra _ attached to the front of the function name? Tag: help with c++ Tag: 259077
  - 17
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  - 23
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  - 25
    - thread-safeness and static CStrings I have some statically defined strings, as in: static CString strThisIsStatic = "Hello"; I have a thread that references my static CStrings with statements like: CString m_LocalString; m_LocalString = strThisIsStatic; if (m_LocalString.CompareNoCase(strThisIsStatic)) ... I am never modifying the strings ocntained within those staticall-defined CStrings. Is it thread-safe to do the above kind of referencing to statically defined CStrings? In general, is it thread-safe to reference statically-defined objects, as along as I never do anything to modify the statically-defined objects from with the thread? - Roger Garrett Tag: help with c++ Tag: 259034

Hi all

has anyone tried including file1.h to file2.h and at the same time
include file2.h to file1.h, and yet get them to properly compiled?
Would putting their class contents in the same file help to solve this
problem? Are there any work around?

Thanks
Ponce

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Re: help with c++ by please

please
Tue Feb 07 08:18:09 CST 2006

ponce schrieb:
> Hi all
>
> has anyone tried including file1.h to file2.h and at the same time
> include file2.h to file1.h, and yet get them to properly compiled?
> Would putting their class contents in the same file help to solve this
> problem? Are there any work around?
>
> Thanks
> Ponce

Two hints:
1. include guards
2. forward declarations

/S
--
Stefan Naewe
naewe.s_AT_atlas_DOT_de

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Re: help with c++ by ponce

ponce
Thu Feb 09 10:06:45 CST 2006

Yes! It works now... thanks :D

Stefan Näwe wrote:
> ponce schrieb:
>
>>Hi all
>>
>>has anyone tried including file1.h to file2.h and at the same time
>>include file2.h to file1.h, and yet get them to properly compiled?
>>Would putting their class contents in the same file help to solve this
>>problem? Are there any work around?
>>
>>Thanks
>>Ponce
>
>
> Two hints:
> 1. include guards
> 2. forward declarations
>
> /S

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