在picture中如何按指定大小显示图片

Question

dialog中放一picture控件，给定图片路径，如何按指定大小将图片显示于picture中，谢谢！

Answer 1

用函数：CDC::StretchBlt
BOOL StretchBlt( int x, int y, int nWidth, int nHeight, CDC* pSrcDC, int xSrc, int ySrc, int nSrcWidth, int nSrcHeight, DWORD dwRop );

Answer 2

CPicture m_picture;
CDC dc=m_picture.getDC();
BITMAP bmp;
HBITMAP  m_hDisplay= (HBITMAP)LoadImage(AfxGetInstanceHandle(),FileName,IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION|LR_DEFAULTSIZE);
GetObject(m_hDisplay,sizeof(bmp),&bmp);
CDC MemDC;
MemDC.CreateCompatibleDC(NULL);
HBITMAP hold=(HBITMAP)MemDC.SelectObject(m_hDisplay);
dc.BitBlt(0,0,bmp.bmWidth,bmp.bmHeight,&MemDC,0,0,SRCCOPY);
MemDC.SelectObject(hold);
DeleteDC(MemDC);
DeleteDC(dc);

Answer 3

IStream *pStm; 
CFileStatus fstatus; 
CFile file; 
LONG cb; 
CRect r_Show;
HDC hdc;

m_Show.GetClientRect(r_Show);
int xpos=r_Show.left;
int ypos=r_Show.top;
int Widthpos=r_Show.Width();
int heightpos=r_Show.Height(); 
if (file.Open(m_PhotoPath,CFile::modeRead)&&file.GetStatus(m_PhotoPath,fstatus)&& ((cb = fstatus.m_size) != -1)) 
{ 
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb); 
LPVOID pvData = NULL; 
if (hGlobal != NULL) 
{ 
if ((pvData = GlobalLock(hGlobal)) != NULL) 
{ 
file.ReadHuge(pvData, cb); 
GlobalUnlock(hGlobal); 
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);  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; 
// 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); 
// if(FAILED(pPic->Render(*pDC,0,0,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL))) 
double fX,fY; 
fX = r_Show.Width();//图片大小
fY = r_Show.Height();
hdc=::GetDC(m_Show.m_hWnd); 
if(FAILED(pPic->Render(hdc,xpos,ypos,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL))) 
AfxMessageBox("Failed To Render The picture!"); 
// pPic->Release(); 
} 
else 
AfxMessageBox("Error Loading Picture From Stream!"); 
}

} 
GlobalFree(hGlobal);
} 
else 
AfxMessageBox("Can't Open Image File!");

Answer 4

CStatic m_Picture ;
CString FileName ="D:\\picture\\__allph.bmp";
HBITMAP  m_hDisplay= (HBITMAP)LoadImage(AfxGetInstanceHandle(),FileName,IMAGE_BITMAP,rect.Width(),rect.Height(),LR_LOADFROMFILE|LR_CREATEDIBSECTION);
m_Picture.SetBitmap(m_hDisplay);

Answer 5

CStatic m_Picture ;
CString FileName ="D:\\picture\\__allph.bmp";
HBITMAP  m_hDisplay= (HBITMAP)LoadImage(AfxGetInstanceHandle(),FileName,IMAGE_BITMAP,rect.Width(),rect.Height(),LR_LOADFROMFILE|LR_CREATEDIBSECTION);
m_Picture.SetBitmap(m_hDisplay);

Answer 6

CStatic m_Picture ;
CString FileName ="D:\\picture\\__allph.bmp";
HBITMAP  m_hDisplay= (HBITMAP)LoadImage(AfxGetInstanceHandle(),FileName,IMAGE_BITMAP,rect.Width(),rect.Height(),LR_LOADFROMFILE|LR_CREATEDIBSECTION);
m_Picture.SetBitmap(m_hDisplay);

Answer 7

将pic对象设一个ID号
再用
GetDlgItem( IDC_PICTURE_1 )->MoveWindow( CRect( ...) );
不行吗？

Answer 8

将pic对象设一个ID号
再用
GetDlgItem( IDC_PICTURE_1 )->MoveWindow( CRect( ...) );
不行吗？

Answer 9

将pic对象设一个ID号
再用
GetDlgItem( IDC_PICTURE_1 )->MoveWindow( CRect( ...) );
不行吗？