初学者请讲windows 编程 ,怎么修窗口的改客户区的背景色?

[sergery]

/*------------------------------------------------------------
   HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
                 (c) Charles Petzold, 1998
  ------------------------------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("HelloWin") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;

     wndclass.style         = CS_HREDRAW | CS_VREDRAW ; // 垂直和水平方向 调整窗口时,重绘
     wndclass.lpfnWndProc   = WndProc ;  // WNDCLASS结构中第二个字段 是 重要参数之一:基于该类的所有窗口的窗口过程(WndProc)的地址
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;

	   // 下面是设置客户区背景色: 注意强制转换为HBRUSH  // WHITE_BRUSH  ,如果要把背景色改为红色,RED_BRUSH?  结果不对...怎么改?

     wndclass.hbrBackground = (HBRUSH) GetStockObject (DKGRAY_BRUSH) ;


     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;  // WNDCLASS结构中最后一个字段 是重要字段之二: 窗口类的名称



     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }


     hwnd = CreateWindow (szAppName,                  // window class name
                          TEXT ("The Hello Program"), // window caption
                          WS_OVERLAPPEDWINDOW,        // window style
                          CW_USEDEFAULT,              // initial x position
                          CW_USEDEFAULT,              // initial y position
                          CW_USEDEFAULT,              // initial x size
                          CW_USEDEFAULT,              // initial y size
                          NULL,                       // parent window handle
                          NULL,                       // window menu handle
                          hInstance,                  // program instance handle
                          NULL) ;                     // creation parameters
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     HDC         hdc ;
     PAINTSTRUCT ps ;
     RECT        rect ;
     
     switch (message)
     {
     case WM_CREATE:
        //  PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;
          return 0 ;

     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;
          
          GetClientRect (hwnd, &rect) ;
          
          DrawText (hdc, TEXT ("----Hello, Windows 98!  ----"), -1, &rect,
                    DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}

[sergery]

// 下面是设置客户区背景色: 注意强制转换为HBRUSH // WHITE_BRUSH ,如果要把背景色改为红色,RED_BRUSH? 结果不对...怎么改?

wndclass.hbrBackground = (HBRUSH) GetStockObject (DKGRAY_BRUSH) ;

[sergery]

[sergery]

我的问题是 想把 客户区 背景色 修改为 红色

wndclass.hbrBackground = (HBRUSH) GetStockObject (DKGRAY_BRUSH) ;


MSDN查看了下 GetStockObject

HGDIOBJ GetStockObject(
int fnObject // stock object type
);

不是太清楚怎么用,好像用SetDCBrushColor?

[Eleven]

HBRUSH hRedBrush = CreateSolidBrush(RGB(255, 0, 0));
wndclass.hbrBackground = hRedBrush/* (HBRUSH) GetStockObject (DKGRAY_BRUSH)*/ ;

[看不见的裂痕]

楼上大版正解

我还有种方法：
在case WM_PAINT:原有基础上增加一段

HBRUSH hRedBrush = CreateSolidBrush(RGB(255, 0, 0));
SelectObject(hdc,hRedBrush);
然后用PatBlt再画一层红色

[sergery]

[Quote=引用 4 楼 的回复:]
HBRUSH hRedBrush = CreateSolidBrush(RGB(255, 0, 0));
wndclass.hbrBackground = hRedBrush/* (HBRUSH) GetStockObject (DKGRAY_BRUSH)*/ ;
[/Quote]

非常谢谢! 测试了OK.

[sergery]

[Quote=引用 5 楼 的回复:]
楼上大版正解

我还有种方法：
在case WM_PAINT:原有基础上增加一段

HBRUSH hRedBrush = CreateSolidBrush(RGB(255, 0, 0));
SelectObject(hdc,hRedBrush);
然后用PatBlt再画一层红色
[/Quote]

试下了没有 没有搞出来, 能解释下 " 然后用PatBlt再画一层红色" ?