GDI+ GetEncoderClsid

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// 导入GDI库

#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")

ULONG_PTR m_gdiplusToken;
Gdiplus::GdiplusStartupInput StartupInput;

GdiplusStartup(&m_gdiplusToken,&StartupInput,NULL); // GDI+初始化
Gdiplus::GdiplusShutdown(m_gdiplusToken); // GDI+卸载

/**@name    GetEncoderClsid@brief   取图片类型GLSID@param[in]        const WCHAR * format@param[in]        CLSID * pClsid@return           int*/int CTest::GetEncoderClsid(const WCHAR* format, CLSID* pClsid){    UINT  num = 0;    UINT  size = 0;    ImageCodecInfo* pImageCodecInfo = NULL;    GetImageEncodersSize(&num, &size);    if(size == 0)        return -1;    pImageCodecInfo = (ImageCodecInfo*)(malloc(size));    if(pImageCodecInfo == NULL)        return -1;    GetImageEncoders(num, size, pImageCodecInfo);    for(UINT j = 0; j < num; ++j)    {        if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )        {            *pClsid = pImageCodecInfo[j].Clsid;            free(pImageCodecInfo);            return j;        }        }    free(pImageCodecInfo);    return -1;}

用法：

CLSID encoderClsid
GetEncoderClsid(L"image/jpeg", &m_jpgClsid);
GetEncoderClsid(L"image/png", &encoderClsid);
GetEncoderClsid(L"image/bmp", &encoderClsid);
GetEncoderClsid(L"image/gif", &encoderClsid);
GetEncoderClsid(L"image/tiff", &encoderClsid);

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