怎么重画？ [英] How to repaint?

问题描述

我打开一个菜单，然后显示一个字符串。一旦它被图片覆盖，那么当图片被删除时，该位置上没有字符串。

I open a menu open, and show a string. as soon as it was covered by a pic, then there is no string on the very position, when the pic was deleted.

如何自动重新绘制它？我尝试使用beginpaint和endpaint，什么都不做。

How shall I repaint it automatically,? I try to use beginpaint and endpaint, do nothing.

.....

char szBuffer [60]; // =" that人民，人民，人民的政府不得在世界上留下";

char szBuffer[60] ;//="that goverment of the people,for the people,by the people shall not persh in the world";

案件WM_COMMAND：

   wmId     = LOWORD（wParam）;

   wmEvent = HIWORD（wParam）;

   //解析菜单选项：

   switch（wmId）

   {

   case IDM_OPEN：

     HDC =的GetDC（HWND）; //尝试使用BeginPaint和endp ...什么都不做。

    xClient = LOWORD（lParam）;

    yClient = HIWORD （lParam）;

    int a，b;

    a = 2; b = 6;

       int nLength;

       nLength = wsprintf （szBuffer，"总和％d和％d是 ％d"，a，b，a + b）;

case WM_COMMAND:
  wmId    = LOWORD(wParam);
  wmEvent = HIWORD(wParam);
  // Parse the menu selections:
  switch (wmId)
  {
  case IDM_OPEN:
   hdc=GetDC(hWnd); //try BeginPaint and endp... do nothing.
   xClient=LOWORD(lParam);
   yClient=HIWORD(lParam);
   int a,b;
   a=2; b=6;
      int nLength;
      nLength=wsprintf(szBuffer,"The sum %d and %d is  %d",a,b,a+b);

    TextOut（hdc，60,300， szBuffer，nLength）; // 输出此处问题

    DrawRectangle（hWnd）;

    ReleaseDC（hWnd，hdc）;

   TextOut(hdc,60,300,szBuffer,nLength);//output here problem
   DrawRectangle(hWnd);
   ReleaseDC(hWnd,hdc);

     return 0;

    return 0;

推荐答案

我打开一个菜单，然后显示一个字符串。一旦它被照片覆盖，那么当照片被删除时，该位置上没有字符串。

如何自动重新绘制它？我尝试使用beginpaint和endpaint，什么都不做。

I open a menu open, and show a string. as soon as it was covered by a pic, then there is no string on the very position, when the pic was deleted.
How shall I repaint it automatically,? I try to use beginpaint and endpaint, do nothing.

你需要能够绘制你需要重绘的所有东西。 $ b你的WM_PAINT处理程序。

You need to have the ability to draw everything you need to redraw in
your WM_PAINT handler.

戴夫

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