Sample Windows Program (C++ Learning Community)

Title: Sample Windows Program
Description: Comments included

Dragon - August 13, 2003 11:03 PM (GMT)

I haven't compiled and tested this code, so there may be errors. Please report errors if there are any. Compile as GUI.

CODE

//Sample Windows Program
//Written by Rui Li

#include <windows.h>

//Declare the callback function
LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);

//Store the Window class name as a global variable
char szClassName[] = "MainWnd";

//WinMain function, similar to that of the main function in standard C++
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
HWND hwnd;
MSG messages;
WNDCLASSEX wincl;

//The Window structure
wincl.cbSize = sizeof(WNDCLASSEX);
wincl.cbClsExtra = 0;
wincl.cbWndExtra = 0;
wincl.style = 0;
wincl.hInstance = hInstance;
wincl.lpszClassName = szClassName;
wincl.lpszMenuName = NULL; //No menu
wincl.lpfnWndProc = WindowProcedure;
wincl.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1); //Color of the window
wincl.hIcon = LoadIcon(NULL, IDI_APPLICATION); //EXE icon
wincl.hIconSm = LoadIcon(NULL, IDI_APPLICATION); //Small program icon
wincl.hCursor = LoadCursor(NULL, IDC_ARROW); //Cursor

//Register the Window class, and if it fails quit the program
if (!RegisterClassEx(&wincl))
return 0;

//Create the program
hwnd = CreateWindowEx(0, //No extended window styles
szClassName, //Class name
"Sample Win32 Program", //Window caption
WS_SYSMENU|WS_MINIMIZEBOX,
CW_USEDEFAULT, CW_USEDEFAULT, //Let Windows decide the left and top positions of the window
640, 480, //Width and height of the window,
NULL, NULL, hInstance, NULL);

//Make the window visible on the screen
ShowWindow(hwnd, nCmdShow);

//Run the message loop
while (GetMessage(&messages, NULL, 0, 0))
{
TranslateMessage(&messages);
DispatchMessage(&messages);
}
return messages.wParam;
}

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}

TheHawgMaster - August 13, 2003 11:19 PM (GMT)

I havn't tested it either (I've writen code similar to that a million times). But I know it will not work unless you add:

CODE

#include <Windows.h>

To the top of the code.

Dragon - August 13, 2003 11:39 PM (GMT)

Hey thanks. You would think that after writing it so many times I would remember that. Oh well. :D

Sam Fisher vs Solid Snake - August 14, 2003 12:15 AM (GMT)

nice codeing Dragon

Dragon - August 14, 2003 12:36 AM (GMT)

There, I fixed it. Also, Sam Fisher, I haven't forgotten about the src for Dragon Text. I'll get to it soon! :)

ZerO - December 7, 2003 11:50 PM (GMT)

I got a error "CXX0017" when I tested it... I'm kinda new to c++ so i wonder what this means and how i fix this....

Dragon - December 8, 2003 12:01 AM (GMT)

I don't know what that error message means, but did you compile the source as a Win32 GUI application?

ih8censorship - December 8, 2003 02:16 AM (GMT)

QUOTE

You would think that after writing it so many times I would remember that.

not me... i just use the dev c++ template and then fill in stuff. but by now i know what everything does, its just i dont want to take the time to code everything by hand because its basicly the same for every program ya make. however i probly couldent make a window code on a first try, so good job even if it doesnt work! (ya dont hear guys say that often :lol: )

Dragon - December 8, 2003 05:48 AM (GMT)

ih8censorship, I remember things like that now. That post was 4 months ago. :D

ZerO - December 8, 2003 01:56 PM (GMT)

Ahh.. Thank you It works perfectly fine now... ;)

Dante Shamest - December 22, 2003 01:12 AM (GMT)

The piece of contributed code has one little problem with it.

The following line of code

CODE

while (GetMessage(&messages, NULL, 0, 0))

should be rewritten as

CODE

while (GetMessage(&messages, NULL, 0, 0)>0)

CODE

while (GetMessage(&messages, NULL, 0, 0)!=0)

This is because GetMessage can return -1 too, which causes a fatal error in rare circumstances. This is documented in MSDN.

Dragon - December 22, 2003 04:43 AM (GMT)

That only happens in rare circumstances and I have never encountered that problem before. It's still good to know about that, though.

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