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returnpTemp;

}

pScaledImage=ScaleBitmap(image,nWidth,nHeight);

方法三,是從Codeguru上一個帖子上看到,和方法二類似,但是用了GDI的東東,我試了試,沒成功,得到的是一幅黑圖片,可能的原因是Bitmap::FromHBITMAP的第二個參數(shù)設(shè)置不對

原文代碼如下:

Bitmap*bitmap=newBitmap(TempBuf);//Createthebitmap

HDCScreen=GetDC(WindowVars.Handle);

piTemp->hdc=CreateCompatibleDC(Screen);//CreateamemoryDC

HBITMAPhbitmap;

if(bStretchPictures)

hbitmap=CreateCompatibleBitmap(Screen,Size.X,Size.Y);

else

hbitmap=CreateCompatibleBitmap(Screen,bitmap->GetWidth(),bitmap->GetHeight());

SelectObject(piTemp->hdc,hbitmap);//InitializetheDC

Graphics*graphics=newGraphics(piTemp->hdc);//CreatetheGraphicsclass

if(bStretchPictures)

graphics->DrawImage(bitmap,0,0,Size.X,Size.Y);//Drawthescaledimage

else

graphics->DrawImage(bitmap,0,0,bitmap->GetWidth(),bitmap->GetHeight());

ReleaseDC(WindowVars.Handle,Screen);

deletegraphics;

deletebitmap;

另外再補上保存圖片的代碼:

{

UINT num=0;

//numberofimageencoders

UINT size=0;

//sizeoftheimageencoderarrayinbytes

ImageCodecInfo*pImageCodecInfo=NULL;

if(GetImageEncodersSize(&num,&size)!=Ok||size==0)

returnfalse; //Failure

pImageCodecInfo=(ImageCodecInfo*)(malloc(size));

if(pImageCodecInfo==NULL)

returnfalse; //Failure

if(GetImageEncoders(num,size,pImageCodecInfo)!=Ok)

returnfalse;

boolbOk=false;

for(UINTj=0;j<num; j)

{

if(wcscmp(pImageCodecInfo[j].MimeType,lpszImageType)==0)

{

pImage->Save(lpszFileName,&(pImageCodecInfo[j].Clsid));

bOk=true;

break;

}

free(pImageCodecInfo);

returnbOk;

}

調(diào)用象這樣就可以保存成各種圖片(當然要求有對應(yīng)的encoder才行):

SaveAsImageFile(pScaledImage,L"1.bmp",L"image/bmp");

SaveAsImageFile(pScaledImage,L"1.jpg",L"image/jpeg");

SaveAsImageFile(pScaledImage,L"1.png",L"image/png");

方法四:?

最后

一個不錯的GDI FAQsite:http://www.bobpowell.net/faqmain.htm

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