VC++6.0 中如何存图和刷新屏幕?

Question

保存位图
主要利用以下的结构和API
结构：BITMAPINFO
API: GetBitmapInfo, GetDIBits
之后按照位图的格式写文件
详细内容察看MSDN

Answer 1

刷屏用Invalidate( BOOL bErase = TRUE );或InvalidateRect( LPCRECT lpRect, BOOL bErase = TRUE );函数的用法细看MSCN！

Answer 2

请详细些！！MemDC.saveas("filename")?

Answer 3

对于存图和上面说的一样，屏暮刷新可用以下三个函数
BOOL GetWindowRect(
  HWND hWnd,      // handle to window
  LPRECT lpRect   // address of structure for window coordinates
);HWND GetDesktopWindow(VOID);InvalidateRect(
  HWND hWnd,  // handle of window with changed update region
  CONST RECT *lpRect,
              // address of rectangle coordinates
  BOOL bErase // erase-background flag
}

Answer 4

------------Method 1-----------
int iScrWidth = GetSystemMetrics(SM_CXSCREEN);
int iScrHeight = GetSystemMetrics(SM_CYSCREEN);HDC hdcScreen = GetDC(NULL);BITMAPINFO bmpInfo;
bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth              = iScrWidth;
bmpInfo.bmiHeader.biHeight             = iScrHeight;
bmpInfo.bmiHeader.biPlanes             = 1;
bmpInfo.bmiHeader.biBitCount           = 24;
bmpInfo.bmiHeader.biCompression        = BI_RGB;
bmpInfo.bmiHeader.biSizeImage          = 0;
bmpInfo.bmiHeader.biXPelsPerMeter      = 0;
bmpInfo.bmiHeader.biYPelsPerMeter      = 0;
bmpInfo.bmiHeader.biClrUsed            = 0;
bmpInfo.bmiHeader.biClrImportant       = 0;void *pvBits = NULL;
HBITMAP hBitmap = CreateDIBSection(hdcScreen,&bmpInfo,DIB_RGB_COLORS,&pvBits,NULL,0);
HDC hdcCompatible = CreateCompatibleDC(hdcScreen);
HBITMAP hOldBitmap = (HBITMAP)SelectObject(hdcCompatible,hBitmap);
BOOL b = BitBlt(hdcCompatible,0,0,iScrWidth,iScrHeight,hdcScreen,0,0,SRCCOPY);HANDLE hFile = CreateFile("yourbmp.bmp",GENERIC_WRITE,FILE_SHARE_WRITE,NULL,
           CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if (hFile != INVALID_HANDLE_VALUE) 
{
   DWORD dwCnt;
   char z[14];
   ZeroMemory(z,14);
   strcpy(z,"BM8");
   z[4] = 0x24;
   z[10] = 0x36;
   WriteFile(hFile,z,14,&dwCnt,NULL);
   WriteFile(hFile,(char*)&bmpInfo,sizeof(BITMAPINFO)-4,&dwCnt,NULL);
   WriteFile(hFile,(char*)pvBits,iScrWidth*iScrHeight*3,&dwCnt,NULL);
   CloseHandle(hFile);
}     
    
------------Method 2---------
CDC * pDC; 
CBitmap  bmpTmp;
CBitmap * bmpOld = bmpTmp.CreateCompatibleBitmap(pDC, 640, 480);   
pDC->SelectObject(bmpTmp);
pDC->MoveTo(0,0); 
pDC->LineTo(300,200);
CBitmap * bmpOut = pDC->SelectObject(bmpOld);----------