vc显示jpg,gif图像简单方法

VC没有直接显示JPG图片的方法，在网上找了个比较简单的列子自己改了下，还挺好用，下面一个函数就行了

[cpp] view plaincopyprint?

1. ShowJpgGif(CDC* pDC,CString strPath, int x, int y)  
2. {  
3.       IStream *pStm;   
4.       CFileStatus fstatus;   
5.       CFile file;   
6.       LONG cb;   
7.       if (file.Open(strPath,CFile::modeRead)&&file.GetStatus(strPath,fstatus)&&((cb = fstatus.m_size) != -1))   
8.       {   
9.             HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb);   
10.             LPVOID pvData = NULL;   
11.             if (hGlobal != NULL)   
12.             {   
13.                   pvData = GlobalLock(hGlobal);  
14.                   if (pvData != NULL)   
15.                   {   
16.                         file.Read(pvData, cb);   
17.                         GlobalUnlock(hGlobal);   
18.                         CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);   
19.                   }  
20.             }  
21.       }  
22.       else  
23.             return false;  
24.       //显示JPEG和GIF格式的图片，GIF只能显示一帧，还不能显示动画，  
25.       //要显示动画GIF请使用ACTIVE控//件。  
26.       IPicture *pPic;  
27.       //load image from file stream  
28.       if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic)))  
29.       {  
30.             OLE_XSIZE_HIMETRIC hmWidth;   
31.             OLE_YSIZE_HIMETRIC hmHeight;   
32.             pPic->get_Width(&hmWidth);   
33.             pPic->get_Height(&hmHeight);   
34.             double fX,fY;   
35.             //get image height and width  
36.             fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->GetDeviceCaps(HORZSIZE)*100.0);   
37.             fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);   
38.             //use render function display image  
39.             if(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL)))   
40.             {  
41.                   pPic->Release();  
42.                   return false;  
43.             }  
44.             pPic->Release();  
45.       }   
46.       else   
47.             return false;   
48.       return true;  
49. }  

ShowJpgGif(CDC* pDC,CString strPath, int x, int y){      IStream *pStm;       CFileStatus fstatus;       CFile file;       LONG cb;       if (file.Open(strPath,CFile::modeRead)&&file.GetStatus(strPath,fstatus)&&((cb = fstatus.m_size) != -1))       {             HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb);             LPVOID pvData = NULL;             if (hGlobal != NULL)             {                   pvData = GlobalLock(hGlobal);                  if (pvData != NULL)                   {                         file.Read(pvData, cb);                         GlobalUnlock(hGlobal);                         CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);                   }            }      }      else            return false;      //显示JPEG和GIF格式的图片，GIF只能显示一帧，还不能显示动画，      //要显示动画GIF请使用ACTIVE控//件。      IPicture *pPic;      //load image from file stream      if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic)))      {            OLE_XSIZE_HIMETRIC hmWidth;             OLE_YSIZE_HIMETRIC hmHeight;             pPic->get_Width(&hmWidth);             pPic->get_Height(&hmHeight);             double fX,fY;             //get image height and width            fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->GetDeviceCaps(HORZSIZE)*100.0);             fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);             //use render function display image            if(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL)))             {                  pPic->Release();                  return false;            }            pPic->Release();      }       else             return false;       return true;}

使用方法：

在对话框上放一个cstatic控件IDC_STC_DUMMY，调整控件大小使得图片能够完全显示

[cpp] view plaincopyprint?

1. CDC* pDC = GetDlgItem(IDC_STC_DUMMY)->GetDC();