I recently started working on learning windows programming, when I tried to compile my first program I got this error mesage: Main.cpp c:\WINDOWS\DESKTOP\BASECODE1\Lines\Main.cpp(52) : error C2664: ''RegisterClassExA'' : cannot convert parameter 1 from ''struct WinMain::_WNDCLASSEX *'' to ''const struct tagWNDCLASSEXA *'' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Error executing cl.exe. Main.obj - 1 error(s), 0 warning(s) I looked at 2 different examples of code to set make a window and could not find any difference in my code and theirs. Here is my code if anyone could help me I would greatly appreciate it: #define WIN32_LEAN_AND_MEAN #include #include LRESULT CALLBACK WindowProc (HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) { return(DefWindowProc(hwnd, msg, wparam, lparam)); } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdline, int nShowCmd) { typedef struct _WNDCLASSEX { UINT cbsize; UINT style; WNDPROC lpfnWndProc; int cbClsExtra; int cbWndExtra; HANDLE hInstance; HICON hIcon; HCURSOR hCursor; HBRUSH hbrBackground; LPCTSTR lpszMenuName; LPCTSTR lpszClassName; HICON hIconSm; } WNDCLASSEX; WNDCLASSEX winclass; winclass.cbsize = sizeof (WNDCLASSEX); winclass.style = CS_HREDRAW | CS_VREDRAW; winclass.lpfnWndProc = WindowProc; winclass.cbClsExtra = 0; winclass.cbWndExtra = 0; winclass.hInstance = hInstance; winclass.hIcon = LoadIcon(NULL, IDI_WINLOGO); winclass.hCursor = LoadCursor(NULL, IDC_ARROW); winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winclass.lpszMenuName = NULL; winclass.lpszClassName = "winclass"; winclass.hIconSm = LoadIcon(NULL, IDI_WINLOGO); RegisterClassEx(&winclass); HWND hwnd; if (!(hwnd = CreateWindowEx(NULL, "winclass", "Lines", WS_OVERLAPPED | WS_VISIBLE, 0, 0, 640, 480, NULL, NULL, hInstance, NULL))) return (0); return 0; }

why are you declaring your own WNDCLASSEX structure??? just include windows.h and use the one in that and itll work fine.

I thought that I had to declare my own WINCLASSEX structure. Anyway, I removed it as you suggested and received the following error:

--------------------Configuration: Lines - Win32 Debug--------------------
Compiling...
Main.cpp
c:\WINDOWS\DESKTOP\BASECODE1\Lines\Main.cpp(24) : error C2039: 'cbsize' : is not a member of 'tagWNDCLASSEXA'
c:\program files\microsoft sdk\include\winuser.h(1441) : see declaration of 'tagWNDCLASSEXA'
Error executing cl.exe.

Main.obj - 1 error(s), 0 warning(s)

When I removed cbsize from my program it compiled and linked correctly, but when I executed it the program didn't do anything.


Edited by - ash_nagasaki on October 22, 2001 12:43:19 AM

You should write

winclass.cbSize

not

winclass.cbsize

That should fix it

That worked. Thanks a lot!

That worked. Thanks a lot!

Coding windows applications and still doesn''t know that c is case significant! ROTFLMAO