C creates Windows window instances

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Steps:
1. Define variables in WinMain
2. Register window class RegisterClass
Create a CreateWindow
4. Display and update Windows

ShowWindow (hwnd, iCmdShow) ;

     UpdateWindow (hwnd) ;

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

     {

          TranslateMessage (&msg) ;

          DispatchMessage (&msg) ;

     }

#include <windows.h>  

  

LRESULT CALLBACK MyProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);  

  

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd )  

{  

     MSG      msg;  

     HWND     hwnd;  

     static TCHAR szAppName[] = "hl";  

  

     WNDCLASS wndclass;  

     wndclass.style        = CS_HREDRAW | CS_VREDRAW;  

     wndclass.cbClsExtra   = 0;  

     wndclass.cbWndExtra   = 0;  

     wndclass.lpfnWndProc  = MyProc;  

     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("error"),TEXT("title"),MB_ICONERROR);  

          return 0;  

     }  

     hwnd = CreateWindow(szAppName,  

                              TEXT("Hello"),  

                              WS_OVERLAPPEDWINDOW,  

                              CW_USEDEFAULT,  

                              CW_USEDEFAULT,  

                              CW_USEDEFAULT,  

                              CW_USEDEFAULT,  

                              NULL,  

                              NULL,  

                              hInstance,  

                              NULL  

                              );  

     ShowWindow(hwnd,nShowCmd);  

     UpdateWindow(hwnd);  

  

     while(GetMessage(&msg,hwnd,0,0))  

     {  

          TranslateMessage(&msg);  

          DispatchMessage(&msg);  

     }  

     return msg.wParam;  

}  

  

LRESULT CALLBACK MyProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)  

{  

  

     switch(message)  

     {  

     case WM_DESTROY:  

          PostQuitMessage(0);  

          return 0;  

     }  

     return DefWindowProc(hwnd,message,wParam,lParam);  

}