获取Picture位置及其大小并显示位图

来源：互联网发布：老男孩知乎编辑：程序博客网时间：2024/05/10 13:55

void Student::DrawBMP()
{
// if we don't have an image, get out of here
JpegFile jpg;

if (pRGB==NULL) return;//pRGB图像数据

CDC *theDC = GetDC();

if (theDC!=NULL) {

  // a 24-bit DIB is DWORD-aligned, vertically flipped and
  // has Red and Blue bytes swapped. we already did the
  // RGB->BGR and the flip when we read the images, now do
  // the DWORD-align

  BYTE *tmp;
  // DWORD-align for display
  UINT m_widthDW;
  tmp = jpg.MakeDwordAlignedBuf(pRGB,
   m_nWidth,
   m_nHeigth,
   &m_widthDW);

  // set up a DIB
  BITMAPINFOHEADER bmiHeader;
  bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
  bmiHeader.biWidth = m_nWidth;
  bmiHeader.biHeight = m_nHeigth;
  bmiHeader.biPlanes = 1;
  bmiHeader.biBitCount = 24;
  bmiHeader.biCompression = BI_RGB;
  bmiHeader.biSizeImage = 0;
  bmiHeader.biXPelsPerMeter = 0;
  bmiHeader.biYPelsPerMeter = 0;
  bmiHeader.biClrUsed = 0;
  bmiHeader.biClrImportant = 0;

CRect cRect;
// CStatic ctrlStatic;//先将picture控件和一个CStatic变量进行绑定

//得到控件的客户区
m_ctrlStatic.GetClientRect(&cRect);
cRect.NormalizeRect();//
m_ctrlStatic.ClientToScreen(&cRect);

//转换到屏幕坐标，其后获取正确的Picture区域大小
int rHeight = cRect.Height();
int rWidth = cRect.Width();

//控件屏幕坐标转换到相对于对话框的客户坐标
ScreenToClient(&cRect);
// 之后才能获取准确的 picture控件与对话框的相对坐标
int rPhotoLeft= cRect.left;
int rPhotoTop = cRect.top ;
int rPhotoRight = cRect.right;
    int rPhotoBottom = cRect.bottom;
  // now blast it to the CDC passed in.
  // lines returns the number of lines actually displayed
  int lines = StretchDIBits(theDC->m_hDC,
   rPhotoLeft, rPhotoTop,
  rPhotoRight-rPhotoLeft,
   rPhotoBottom-rPhotoTop,
   0,0,
   bmiHeader.biWidth,
   bmiHeader.biHeight,
   tmp,
   (LPBITMAPINFO)&bmiHeader,
   DIB_RGB_COLORS,
   SRCCOPY);

  delete [] tmp;

  ReleaseDC(theDC);

}
}

//////////////////////////////////////////////////////////////////////////

如果不绑定Picture控件也可如下：

CWnd* pWnd = GetDlgItem(IDC_PICTURE);

pWnd->GetClientRect(&recrt);//相对控件本身的坐标recrt.left=0；recrt.top=0；
pWnd->GetWindowRect(&rect2);//相对与窗体的坐标
pWnd->MoveWindow(0,0,800,600,1);//设置控件的位置和大小