谁知道怎么用IJG来保存位图为.jpg？？

[lyzcom]

我只会用IJG解码JPG为位图，但是不会将位图保存为.jpg，看了一下jpeglib.h的头文件，但没有找着门路。

哪位大哥有现成的示例的，帮帮小弟吧。

[huanyun]

IJL


int nRet = XIMGFAILURE;
BOOL bChange24=FALSE, bVertFlip = FALSE;
CXImgObj *pImg,xImg24;

pImg = &ImgObj;
if((ImgObj.GetBitCount() == 32 && !bColor) || ImgObj.GetBitCount() != 24)
{
xImg24.Create(24, ImgObj);
pImg = &xImg24;
bChange24 = TRUE;
}

if(pImg->IsTopDown())
{
pImg->VertFlipBits();
bVertFlip = TRUE;
}
JPEG_CORE_PROPERTIES image;
ZeroMemory(&image, sizeof(JPEG_CORE_PROPERTIES));
TRY
{
if (ijlInit(&image) != IJL_OK)
{
TRACE("Can't initialize Intel(R) JPEG library\n");
AfxThrowUserException();
}

image.jquality = nQuality;
image.upsampling_reqd = image.cconversion_reqd = FALSE;

image.DIBWidth = pImg->m_nWidth;
image.DIBHeight = pImg->m_nHeight;
image.DIBBytes = pImg->m_pBits;

image.JPGFile = const_cast<char*>(lpszPath);
image.JPGWidth = pImg->m_nWidth;
image.JPGHeight = pImg->m_nHeight;

switch (pImg->m_nBitCount)
{
case 24:
image.DIBColor = IJL_BGR;
image.DIBChannels = 3;
image.DIBPadBytes = IJL_DIB_PAD_BYTES(image.DIBWidth,3);
if(bColor)
{
image.JPGColor = IJL_YCBCR;
image.JPGChannels = 3;
image.JPGSubsampling = IJL_411;
}
else
{
image.JPGColor = IJL_G;
image.JPGChannels = 1;
image.JPGSubsampling = IJL_NONE;
}
break;

case 32:
image.DIBColor = IJL_RGBA_FPX;
image.DIBChannels = 4;
image.DIBPadBytes = IJL_DIB_PAD_BYTES(image.DIBWidth,4);
image.JPGColor = IJL_YCBCRA_FPX;
image.JPGChannels = 4;
image.JPGSubsampling = IJL_4114;
break;
default:
break;
}

if (image.DIBColor == IJL_RGBA_FPX)
{
ChangeRGB(image.DIBBytes,image.DIBWidth,image.DIBHeight);
}


if (ijlWrite(&image, IJL_JFILE_WRITEWHOLEIMAGE) != IJL_OK)
{
TRACE("Can't write image\n");
AfxThrowUserException();
}

if (ijlFree(&image) != IJL_OK)
{
TRACE("Can't free Intel(R) JPEG library\n");
}
nRet = XIMGSUCCESS;
}
CATCH_ALL(e)
{
ijlFree(&image);
AfxMessageBox("Error storing JPEG file");
}
END_CATCH_ALL
if(!bChange24 && bVertFlip) pImg->VertFlipBits();
return nRet;

[hamham]

intel jpeg库吗？我也想知道