OpenGL + WinXP woes..
Author
Im having a problem with an OGL application im attempting to
run. It crashes when ran, and the line its pointing to is:
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
And when I debug it, the error says:
"The instruction at "0x77e6163c" refenced memory at "0xcccccccc". The memory could not be "written".
Any idea on what might cause this? I will post the rest of the source if needed.
thanks
[edited by - Klopper on July 26, 2002 3:10:04 PM]
That message sounds like your trying to write to a NULL pointer somehow, post your winmain function.
Author
Here is my WinMain function...
[edited by - klopper on July 27, 2002 3:10:57 AM]
[edited by - klopper on July 27, 2002 3:12:43 AM]
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){ fwndHeight = GetSystemMetrics(SM_CYSCREEN); //Get height of screen resolution fwndWidth = GetSystemMetrics(SM_CXSCREEN); //Get width of screen resolution WNDCLASSEX windowClass; MSG msg; bool done; RECT windowRect; DWORD dwExStyle; DWORD dwStyle; LPSYSTEMTIME time; // System time // Start log with date FILE *log = fopen("log.txt", "w"); // Get time info and print it GetSystemTime(time); fprintf(log, "-My Game Template- Run Log\n\n"); fprintf(log, "Logged: %d:%d %d/%d/%d\n", time->wHour-7, time->wMinute, time->wMonth, time->wDay, time->wYear); if(MessageBox(NULL, "Would you like to run in fullscreen?", "Display Settings,", MB_YESNO|MB_ICONQUESTION)==IDNO) { fullscreen = false; } windowRect.left = (long)0; windowRect.right = (long)fwndWidth; windowRect.top = (long)0; windowRect.bottom = (long)fwndHeight; windowClass.cbSize = sizeof(WNDCLASSEX); windowClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; windowClass.lpfnWndProc = WndProc; windowClass.cbClsExtra = 0; windowClass.cbWndExtra = 0; windowClass.hInstance = hInstance; windowClass.hIcon = LoadIcon(NULL, IDI_APPLICATION); windowClass.hCursor = LoadCursor(NULL, IDC_ARROW); windowClass.hbrBackground = NULL; windowClass.lpszMenuName = NULL; windowClass.lpszClassName = className; windowClass.hIconSm = LoadIcon(NULL, IDI_WINLOGO); if (!RegisterClassEx(&windowClass)) { fprintf(log, "\nCreating window... [ FAILED ]"); return 0; } fprintf(log, "\nCreating window... [ OK ]"); if(fullscreen) { DEVMODE dm; //device mode memset(&dm, 0, sizeof(dm)); dm.dmSize = sizeof(dm); dm.dmPelsWidth = fwndWidth; dm.dmPelsHeight = fwndHeight; dm.dmBitsPerPel = fwndBits; dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT; if(ChangeDisplaySettings(&dm, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL) { //switch to windowed mode MessageBox(NULL, "The display settings requires 16-bits per pixel.\nCombat Platoon will continue in windowed mode.", "Display Error", MB_OK); fullscreen = false; } } if(fullscreen) { dwExStyle = WS_EX_APPWINDOW; dwStyle = WS_POPUP; // simple window with no borders or title bar ShowCursor(FALSE); // hide the cursor for now } else { dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; dwStyle = WS_OVERLAPPEDWINDOW; } AdjustWindowRectEx(&windowRect, dwStyle, FALSE, dwExStyle); hwnd = CreateWindowEx(dwExStyle, className, windowTitle, dwStyle | WS_CLIPCHILDREN | WS_CLIPSIBLINGS, 0, 0, windowRect.right - windowRect.left, windowRect.bottom - windowRect.top, NULL, NULL, hInstance, NULL); if (!hwnd) return 0; ShowWindow(hwnd, SW_SHOW); UpdateWindow(hwnd); done = false; fclose(log); // Close our log while (!done) { PeekMessage(&msg, hwnd, NULL, NULL, PM_REMOVE); if (msg.message == WM_QUIT) { done = true; engine.CleanUp(); } else { // Draw our game engine.RenderScene(); SwapBuffers(g_HDC); TranslateMessage(&msg); DispatchMessage(&msg); } } if(fullscreen) { ChangeDisplaySettings(NULL, 0); //switch back to desktop ShowCursor(TRUE); }return msg.wParam;} [edited by - klopper on July 27, 2002 3:10:57 AM]
[edited by - klopper on July 27, 2002 3:12:43 AM]
It looks like GetSystemTime is your culprit. You are passing it a pointer to unallocated space. Try this:
SYSTEMTIME time;
GetSystemTime(&time);
This should fix it.
SYSTEMTIME time;
GetSystemTime(&time);
This should fix it.
Author
quote:Original post by strtok
It looks like GetSystemTime is your culprit. You are passing it a pointer to unallocated space. Try this:
SYSTEMTIME time;
GetSystemTime(&time);
This should fix it.
I get this error when I run that..
c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(100) : error C2664: 'GetSystemTime' : cannot convert parameter 1 from 'struct _SYSTEMTIME ** ' to 'struct _SYSTEMTIME *'
UPDATE: When I comment those lines out, it compiles and runs fine. Any idea on how I can get the system time?
[edited by - Klopper on July 27, 2002 3:24:31 PM]
quote:Original post by KlopperOriginal post by strtok
It looks like GetSystemTime is your culprit. You are passing it a pointer to unallocated space. Try this:
SYSTEMTIME time;
GetSystemTime(&time);
This should fix it.
I get this error when I run that..
c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(100) : error C2664: ''GetSystemTime'' : cannot convert parameter 1 from ''struct _SYSTEMTIME ** '' to ''struct _SYSTEMTIME *''
UPDATE: When I comment those lines out, it compiles and runs fine. Any idea on how I can get the system time?
[edited by - Klopper on July 27, 2002 3:24:31 PM]
GetSystemTime (time) ….
Metal Typhoon
Make sure you''re not defining time as a pointer.
i.e. don''t define it like this
LPSYSTEMTIME time;
or
SYSTEMTIME time;
Instead you must define it like this
SYSTEMTIME time;
and then when you pass it to GetSystemTime you must pass the address of time, &time. So like this
GetSystemTime(&time);
GetSystemTime takes a pointer to a SYSTEMTIME structure, but if you simply define time as a pointer, it won''t be pointing to a SYSTEMTIME struct.
I think that should solve all your troubles.
Ian Halliday yo
PWEENED
i.e. don''t define it like this
LPSYSTEMTIME time;
or
SYSTEMTIME time;
Instead you must define it like this
SYSTEMTIME time;
and then when you pass it to GetSystemTime you must pass the address of time, &time. So like this
GetSystemTime(&time);
GetSystemTime takes a pointer to a SYSTEMTIME structure, but if you simply define time as a pointer, it won''t be pointing to a SYSTEMTIME struct.
I think that should solve all your troubles.
Ian Halliday yo
PWEENED
Author
quote:Original post by Billymon
Make sure you''re not defining time as a pointer.
SYSTEMTIME time;
and then when you pass it to GetSystemTime you must pass the address of time, &time. So like this
GetSystemTime(&time);
GetSystemTime takes a pointer to a SYSTEMTIME structure, but if you simply define time as a pointer, it won''t be pointing to a SYSTEMTIME struct.
When I use what you said, I get about 10 errors:
c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2819: type ''_SYSTEMTIME'' does not have an overloaded member ''operator ->'' d:\program files\microsoft visual studio\vc98\include\winbase.h(249) : see declaration of ''_SYSTEMTIME''c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2227: left of ''->wHour'' must point to class/struct/unionc:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2819: type ''_SYSTEMTIME'' does not have an overloaded member ''operator ->'' d:\program files\microsoft visual studio\vc98\include\winbase.h(249) : see declaration of ''_SYSTEMTIME''c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2227: left of ''->wMinute'' must point to class/struct/unionc:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2819: type ''_SYSTEMTIME'' does not have an overloaded member ''operator ->'' d:\program files\microsoft visual studio\vc98\include\winbase.h(249) : see declaration of ''_SYSTEMTIME''c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2227: left of ''->wMonth'' must point to class/struct/unionc:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2819: type ''_SYSTEMTIME'' does not have an overloaded member ''operator ->'' d:\program files\microsoft visual studio\vc98\include\winbase.h(249) : see declaration of ''_SYSTEMTIME''c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2227: left of ''->wDay'' must point to class/struct/unionc:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2819: type ''_SYSTEMTIME'' does not have an overloaded member ''operator ->'' d:\program files\microsoft visual studio\vc98\include\winbase.h(249) : see declaration of ''_SYSTEMTIME''c:\documents and settings\zach\desktop\projects\2dogl\main.cpp(102) : error C2227: left of ''->wYear'' must point to class/struct/union
ah, heh. Those errors are because you were originally writing your program with time as a pointer, but now you''ve changed it to a normal object.
To access members of a pointer, you need to use the -> (arrow) operator, as you''ve obviously done in your program.
To access members of a normal object, you use the . (dot) operator. So simply change all your time-> to time.
ptr->member is equivalent to (*ptr).member, -> is just shorthand
here''s an article on pointers if you''d like to learn more about them
http://www.gamedev.net/reference/articles/article1697.asp
I hope this time i''ve solved all your problems
Ian Halliday yo
PWEENED
To access members of a pointer, you need to use the -> (arrow) operator, as you''ve obviously done in your program.
To access members of a normal object, you use the . (dot) operator. So simply change all your time-> to time.
ptr->member is equivalent to (*ptr).member, -> is just shorthand
here''s an article on pointers if you''d like to learn more about them
http://www.gamedev.net/reference/articles/article1697.asp
I hope this time i''ve solved all your problems
Ian Halliday yo
PWEENED
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