手動編寫最簡單win32窗口

#include<windows.h>

HINSTANCE g_hInstance = 0;

LRESULT WINAPI WndProc( HWND hWnd, UINT uMsg,
  WPARAM wParam, LPARAM lParam ){
switch( uMsg ){
case WM_DESTROY:
PostQuitMessage( 0 );
break;
}
return DefWindowProc( hWnd, uMsg, wParam, lParam );
}
//註冊窗口類
BOOL Register( WNDPROC wndProc, LPSTR pszClassName ){
WNDCLASSEX wce = { 0 };
wce.cbSize = sizeof( wce );
wce.cbClsExtra = 0;
wce.cbWndExtra = 0;
wce.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wce.hCursor = NULL;
wce.hIcon = NULL;
wce.hIconSm = NULL;
wce.hInstance = g_hInstance;
wce.lpfnWndProc = wndProc;
wce.lpszClassName = pszClassName;
wce.lpszMenuName = NULL;
wce.style = CS_HREDRAW|CS_VREDRAW;
ATOM nAtom = RegisterClassEx( &wce );
if( nAtom == 0 ){
return 0;
}
return 1;
}
//創建窗口
HWND Create( LPSTR pszClassName, LPSTR pszWndName ){
HWND hWnd = CreateWindowEx( 0, pszClassName, pszWndName,
WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, g_hInstance, NULL );
return hWnd;
}
//顯示窗口
void Display( HWND hWnd ){
ShowWindow( hWnd, SW_SHOW );
UpdateWindow( hWnd );
}
//消息循環
void Message( ){
MSG nMsg = { 0 };
while( GetMessage( &nMsg, NULL, 0, 0 ) ){
TranslateMessage( &nMsg );
DispatchMessage( &nMsg );
}
}


int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
g_hInstance = hInstance;
BOOL nRet = Register( WndProc, "Main" );
if( nRet == 0 ){
MessageBox( NULL, "註冊失敗", "Error", MB_OK );
return 0;
}
HWND hWnd = Create( "Main", "Win" );
Display( hWnd );
Message( );
return 0;
}