如何保存picture控件的图片？

[yeyuanzhi2000]

我用picture控件显示视频。现在想做一个视频快照，保存其中一帧的图片。下面我找到一个保存对话框图片的代码：

CClientDC SHDC(this);//
 CPaintDC   dc(this);
 CDC memDC;
 CRect rect;
 GetClientRect(rect);

 memDC.CreateCompatibleDC(&SHDC);
 CBitmap bm;
 int Width = rect.Width();//
 int Height = rect.Height();//
 bm.CreateCompatibleBitmap(&SHDC, Width, Height);
 CBitmap*  pOld = memDC.SelectObject(&bm);
 memDC.BitBlt(0, 0, Width, Height, &SHDC, 0, 0, SRCCOPY);
 memDC.SelectObject(pOld);
 BITMAP  btm;
 bm.GetBitmap(&btm);
 DWORD  size = btm.bmWidthBytes * btm.bmHeight;
 LPSTR lpData =(LPSTR)GlobalAllocPtr(GPTR, size);
 BITMAPFILEHEADER   bfh;
/////////////////////////////////////////////
 BITMAPINFOHEADER  bih;
 bih.biBitCount = btm.bmBitsPixel;
 bih.biClrImportant = 0;
 bih.biClrUsed = 0;
 bih.biCompression = 0;
 bih.biHeight = btm.bmHeight;
 bih.biPlanes = 1;
 bih.biSize = sizeof(BITMAPINFOHEADER);
 bih.biSizeImage = size;
 bih.biWidth = btm.bmWidth;
 bih.biXPelsPerMeter = 0;
 bih.biYPelsPerMeter = 0;
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
 bfh.bfReserved1 = bfh.bfReserved2 = 0;
 bfh.bfType = ((WORD)('M'<< 8)|'B');
 bfh.bfSize = 54 + size;
 bfh.bfOffBits = 54;

 CFileDialog dlg(false,_T("BMP"),_T("*.bmp"),OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("*.bmp|*.bmp|*.*|*.*|"));
 if (dlg.DoModal()==IDOK)
 {
  CFile  bf;
  CString ss=dlg.GetPathName();
  if(bf.Open(ss, CFile::modeCreate | CFile::modeWrite))
  {
   bf.WriteHuge(&bfh, sizeof(BITMAPFILEHEADER));
   bf.WriteHuge(&bih, sizeof(BITMAPINFOHEADER));
   bf.WriteHuge(lpData, size);
   bf.Close();
  }
  GlobalFreePtr(lpData);
 }

哪位高手能帮我修改？谢谢！！

[yeyuanzhi2000]

我的自绘视频框代码如下：

void CMainFrame::OnVideoData(CStatic* Rect,char* Video)
{
    RECT rc;
    Rect->GetClientRect(&rc);
    HDC hdc=::GetDC(Rect->m_hWnd);
    HBITMAP m_hBmp=CreateCompatibleBitmap(hdc,rc.right,rc.bottom);
    HDC hMemDC=CreateCompatibleDC(hdc);
    HBITMAP hob=(HBITMAP)SelectObject(hMemDC,m_hBmp);
    if(hob)
    {
        char* p;
        p=Video;
        BITMAPINFOHEADER* pbih=&m_CodecMgr[0].m_BmpU.bmiHeader;
        
        HDRAWDIB h=DrawDibOpen();
        DrawDibDraw(h,hMemDC,0,0,rc.right,rc.bottom,pbih,p,0,0,pbih->biWidth,pbih->biHeight,DDF_NOTKEYFRAME);
        DrawDibClose(h);
        BitBlt(hdc,0,0,rc.right,rc.bottom,hMemDC,0,0,SRCCOPY);
        SelectObject(hMemDC,hob);
        pbih=NULL;
        delete pbih;
    }
    DeleteDC(hMemDC);
    ::ReleaseDC(Rect->m_hWnd,hdc);
    DeleteObject(m_hBmp);
}

[kuailekemi]

关注

[yeyuanzhi2000]

我是这样修改的：

CStatic* Rect=(CStatic*)GetDlgItem(IDC_VIDEO);
RECT rc;
    Rect->GetClientRect(&rc);
    HDC hdc=::GetDC(Rect->m_hWnd);
    HBITMAP bm=CreateCompatibleBitmap(hdc,rc.right,rc.bottom);
    HDC memDC=CreateCompatibleDC(hdc);
    HBITMAP hob=(HBITMAP)SelectObject(memDC,bm);


BitBlt(hdc,0,0,rc.right,rc.bottom,memDC,0,0,SRCCOPY);

 BITMAP  btm;
 bm.GetBitmap(&btm);//问题出在这里，怎么回事？
 DWORD  size = btm.bmWidthBytes * btm.bmHeight;
 LPSTR lpData =(LPSTR)GlobalAllocPtr(GPTR, size);
 BITMAPFILEHEADER   bfh;
/////////////////////////////////////////////
 BITMAPINFOHEADER  bih;
 bih.biBitCount = btm.bmBitsPixel;
 bih.biClrImportant = 0;
 bih.biClrUsed = 0;
 bih.biCompression = 0;
 bih.biHeight = btm.bmHeight;
 bih.biPlanes = 1;
 bih.biSize = sizeof(BITMAPINFOHEADER);
 bih.biSizeImage = size;
 bih.biWidth = btm.bmWidth;
 bih.biXPelsPerMeter = 0;
 bih.biYPelsPerMeter = 0;
 GetDIBits(hdc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
 bfh.bfReserved1 = bfh.bfReserved2 = 0;
 bfh.bfType = ((WORD)('M'<< 8)|'B');
 bfh.bfSize = 54 + size;
 bfh.bfOffBits = 54;

 CFileDialog dlg(false,_T("BMP"),_T("*.bmp"),OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("*.bmp|*.bmp|*.*|*.*|"));
 if (dlg.DoModal()==IDOK)
 {
  CFile  bf;
  CString ss=dlg.GetPathName();
  if(bf.Open(ss, CFile::modeCreate | CFile::modeWrite))
  {
   bf.WriteHuge(&bfh, sizeof(BITMAPFILEHEADER));
   bf.WriteHuge(&bih, sizeof(BITMAPINFOHEADER));
   bf.WriteHuge(lpData, size);
   bf.Close();
  }
  GlobalFreePtr(lpData);
 }

但是编译出错：
error C2228: left of '.GetBitmap' must have class/struct/union type
请高手指点。谢谢！！

[快乐鹦鹉]

HBITMAP bm=CreateCompatibleBitmap(hdc,rc.right,rc.bottom);
===
HBITMAP是个结构体，不是类，没有成员函数。需要用CBitmap。
CBitmap *pBmp = CBitmap::FromHandle(bm);
pBmp->GetBitmap(&btm);

[hzy694358]

mark

[会飞的老鱼]

将 bm.GetBitmap(&btm); 改为

CBitmap m_bm;
m_bm.Attch(bm);
m_bm.GetBitmap(&btm);

即可

[青稞]

编译错误中已经提示你了啊..要用CBitmap阿....

[ProgrammerNO1]

用IImage有啥弊端