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);  }