MFC显示jpg图片
2012-07-13 14:37
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/*************************************************
Function : ShowJPG
Description : 在DC上按图片原始尺寸显示JPG图片
Calls :
Called By :
Parameter : [CDC* pDC] --- DC
: [CString strPath] --- 要显示的图片路径,建议全路径
: [int x] --- DC上显示的X位置
: [int y] --- DC上显示的Y位置
: [bool OriginalSize] --- 是否按图片原始尺寸显示,false时将按DC大小缩放
Return : bool --- 是否成功
Author : Unknown
Date : 2008-10-24
Modify :
*************************************************/
bool ShowJPG(CDC* pDC,CString strPath, int x, int y, bool OriginalSize)
{
IStream *pStm;
CFileStatus fstatus;
CFile file;
LONG cb;
//打开文件并检测文件的有效性
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.ReadHuge(pvData, cb);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);
}
}
}
else
{
return false;
}
//打开文件结束
//显示JPEG图片
IPicture *pPic;
//load image from file stream
if(SUCCEEDED(OleLoadPicture(pStm, fstatus.m_size, TRUE,IID_IPicture, (LPVOID*)&pPic)))
{
if (OriginalSize) //图片原始大小显示
{
long nWidth = 0, nHeight = 0; // 宽高,MM_HIMETRIC 模式,单位是0.01毫米
pPic->get_Width( &nWidth ); // 宽
pPic->get_Height( &nHeight ); // 高
CSize sz( nWidth, nHeight );
pDC->HIMETRICtoDP( &sz ); // 转换 MM_HIMETRIC 模式单位为 MM_TEXT 像素单位
pPic->Render(pDC->m_hDC, 0, 0, sz.cx, sz.cy,
0, nHeight, nWidth, -nHeight, NULL);
}
else
{
OLE_XSIZE_HIMETRIC hmWidth;
OLE_YSIZE_HIMETRIC hmHeight;
pPic->get_Width(&hmWidth);
pPic->get_Height(&hmHeight);
//get image height and width
double fX,fY;
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
//按图片原始大小显示
if(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL)))
{
pPic->Release();
return false;
}
}
if ( pStm ) pStm->Release(); // 释放 IStream 指针
if ( pPic ) pPic->Release(); // 释放 IPicture 指针
}
else
{
return false;
}
return true;
}
Function : ShowJPG
Description : 在DC上按图片原始尺寸显示JPG图片
Calls :
Called By :
Parameter : [CDC* pDC] --- DC
: [CString strPath] --- 要显示的图片路径,建议全路径
: [int x] --- DC上显示的X位置
: [int y] --- DC上显示的Y位置
: [bool OriginalSize] --- 是否按图片原始尺寸显示,false时将按DC大小缩放
Return : bool --- 是否成功
Author : Unknown
Date : 2008-10-24
Modify :
*************************************************/
bool ShowJPG(CDC* pDC,CString strPath, int x, int y, bool OriginalSize)
{
IStream *pStm;
CFileStatus fstatus;
CFile file;
LONG cb;
//打开文件并检测文件的有效性
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.ReadHuge(pvData, cb);
GlobalUnlock(hGlobal);
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);
}
}
}
else
{
return false;
}
//打开文件结束
//显示JPEG图片
IPicture *pPic;
//load image from file stream
if(SUCCEEDED(OleLoadPicture(pStm, fstatus.m_size, TRUE,IID_IPicture, (LPVOID*)&pPic)))
{
if (OriginalSize) //图片原始大小显示
{
long nWidth = 0, nHeight = 0; // 宽高,MM_HIMETRIC 模式,单位是0.01毫米
pPic->get_Width( &nWidth ); // 宽
pPic->get_Height( &nHeight ); // 高
CSize sz( nWidth, nHeight );
pDC->HIMETRICtoDP( &sz ); // 转换 MM_HIMETRIC 模式单位为 MM_TEXT 像素单位
pPic->Render(pDC->m_hDC, 0, 0, sz.cx, sz.cy,
0, nHeight, nWidth, -nHeight, NULL);
}
else
{
OLE_XSIZE_HIMETRIC hmWidth;
OLE_YSIZE_HIMETRIC hmHeight;
pPic->get_Width(&hmWidth);
pPic->get_Height(&hmHeight);
//get image height and width
double fX,fY;
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
//按图片原始大小显示
if(FAILED(pPic->Render(*pDC,x,y,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL)))
{
pPic->Release();
return false;
}
}
if ( pStm ) pStm->Release(); // 释放 IStream 指针
if ( pPic ) pPic->Release(); // 释放 IPicture 指针
}
else
{
return false;
}
return true;
}
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