请高人指点：编译通过但没有显示？？

Question

hinst=hInstance; 
hwnd=CreateWindow("wtmc","系统测试版",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 
                CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,(HWND)NULL,(HMENU)NULL,hInstance,(LPSTR)NULL); 

Answer 1

#include<windows.h> 
HINSTANCE hinst; 
LRESULT CALLBACK wtmcproc(HWND,UINT,WPARAM,LPARAM); 
//LRESULT CALLBACK DefwPorc(HWND,UINT,WPARAM,LPARAM); 
HINSTANCE hInstance; 
int APIENTRY WinMain(HINSTANCE hInstance, 
                     HINSTANCE hPrevInstance, 
                     LPSTR     lpCmdLine, 
                     int       nCmdShow) 
{ 
MSG msg; 
    WNDCLASS wtmc; 
wtmc.style=CS_HREDRAW|CS_VREDRAW; 
wtmc.cbClsExtra =0; 
wtmc.cbWndExtra =0; 
wtmc.lpfnWndProc =wtmcproc; 
wtmc.hInstance =hPrevInstance; //此处应为hPrevInstance
wtmc.hIcon =LoadIcon(NULL,IDI_APPLICATION); 
wtmc.hCursor =LoadCursor(NULL,IDC_ARROW); 
wtmc.hbrBackground =(HBRUSH)(COLOR_WINDOW+1); 
wtmc.lpszClassName ="wtmc"; 
wtmc.lpszMenuName =NULL; 
if(!RegisterClass(&wtmc)) 
return 0; 
HWND hwnd; 
hinst=hInstance; 
hwnd=CreateWindow("wtmc","系统测试版",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 
                CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,(HWND)NULL,(HMENU)NULL,hInstance,(LPSTR)NULL); 
//hins=hInstance; 
ShowWindow(hwnd,nCmdShow); 
UpdateWindow(hwnd); while(GetMessage(&msg,NULL,0,0)) 
{ 
TranslateMessage(&msg); 
DispatchMessage(&msg); 
} return (msg.wParam ); 
} 
LRESULT CALLBACK wtmcproc(HWND hwnd,UINT message ,WPARAM wparam,LPARAM lparam) 
{ 
HDC hdc; 
PAINTSTRUCT ps; 
switch(message) 
{ 
case WM_PAINT: 
hdc=BeginPaint(hwnd,&ps); 
TextOut(hdc,285,230,"test ",5); 
ValidateRect(hwnd,NULL); 
EndPaint(hwnd,&ps); 
break; 
case WM_DESTROY: 
PostQuitMessage(0); 
break; 
//default: 
// return(DefwPorc(hwnd,message,wparam,lparam)); 
default: 
 return(DefWindowProc(hwnd,message,wparam,lparam)); //有的消息没处理
// break; 
} 
return 0; 
}

Answer 2

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