GdiplusUser

/* ******* GdiplusUserU.h **********
********* GDI+图像操作函数声明 ********** */

/* author: autumoon */

#pragma once

#include <afx.h>        //Cstring
#include <gdiplus.h>
using namespace Gdiplus;
#include "StrDirFileU.h"

#pragma comment(lib, "lib/gdiplus.lib")

class CGdiplusUser
{
public:
    CGdiplusUser();
    ~CGdiplusUser();

private:
    GdiplusStartupInput m_Gdistart; 
    ULONG_PTR m_GdiplusToken; 
    CStrDirFile sdf;

private:
    int GetImageCLSID(const WCHAR* format, CLSID* pCLSID);

public:
    int ConvertOneImage(const CString& strLoadFile, const CString& strSaveFile);
    int ConvertImageInDir(const CString& strDirSrc, const CString& strDirDst, const CString& strSuffix = _T(".jpg"));
};

/* ******* GdiplusUserU.cpp **********
********* GDI+图像操作函数实现 ********** */

/* author: autumoon */

#include "GdiplusUserU.h"

CGdiplusUser::CGdiplusUser()
{
    GdiplusStartup(&m_GdiplusToken, &m_Gdistart, NULL); 
}

CGdiplusUser::~CGdiplusUser()
{
    GdiplusShutdown(m_GdiplusToken);
}

int CGdiplusUser::GetImageCLSID(const WCHAR* format, CLSID* pCLSID) 
{ //得到格式为format的图像文件的编码值，访问该格式图像的COM组件的GUID值保存在pCLSID中 
    UINT num = 0; 
    UINT size = 0; 
    ImageCodecInfo* pImageCodecInfo = NULL; 
    GetImageEncodersSize(&num, &size); 
    if(size == 0) 
        return FALSE; // 编码信息不可用 
    //分配内存 
    pImageCodecInfo = (ImageCodecInfo*)(malloc(size)); 
    if(pImageCodecInfo == NULL) 
        return FALSE; // 分配失败 
    //获得系统中可用的编码方式的所有信息 
    GetImageEncoders(num, size, pImageCodecInfo); 
    //在可用编码信息中查找format格式是否被支持 
    for(UINT i = 0; i < num; ++i) 
    { //MimeType：编码方式的具体描述 
        if( wcscmp(pImageCodecInfo[i].MimeType, format) == 0 ) 
        { 
            *pCLSID = pImageCodecInfo[i].Clsid; 
            free(pImageCodecInfo); 
            return TRUE; 
        } 
    } 
    free(pImageCodecInfo); 
    return FALSE; 
}

int CGdiplusUser::ConvertOneImage(const CString& strLoadFile, const CString& strSaveFile)
{
    CString strLoadExt,strSaveExt;//获取打开和保存的图像文件后缀名
    int nLenLoadExt = strLoadFile.ReverseFind('.');
    int nLenSaveExt = strSaveFile.ReverseFind('.');
    strLoadExt = strLoadFile.Right(strLoadFile.GetLength()-nLenLoadExt-1);
    strSaveExt = strSaveFile.Right(strSaveFile.GetLength()-nLenSaveExt-1);
    strLoadExt.MakeLower();
    strSaveExt.MakeLower();
    //判断文件后缀名是否正确
    if (strSaveExt!="bmp"&&strSaveExt!="jpg"&&strSaveExt!="jpeg"&&strSaveExt!="png"\
        &&strSaveExt!="tiff"&&strSaveExt!="gif")
    {
        return FALSE;
    }
    if("jpg" == strSaveExt)
        strSaveExt = "jpeg";

    CLSID encoderClsid ;
    Image *image = NULL;

    //加载文件
    image = Bitmap::FromFile(strLoadFile,TRUE);
    if (image==NULL)
    {
        return FALSE;
    }
    WCHAR Wctype[1024]=L"image/";
    wcscat(Wctype,strSaveExt);
    ///读图片CLSID///////////////////////////////////////////////////////////////////////
    GetImageCLSID(Wctype,&encoderClsid);

    //保存图片
    BOOL bRes = TRUE;
    if(Ok != image->Save(strSaveFile,&encoderClsid,NULL))
    {
        MessageBox(NULL, _T("转换失败!"), _T("提示"), MB_ICONWARNING);
        bRes = FALSE;
    }

    delete image;
    return bRes;
}

int CGdiplusUser::ConvertImageInDir(const CString& strDirSrc, const CString& strDirDst, const CString& strSuffix/* = _T(".jpg")*/)
{
    CStringArray arrFiles;
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".bmp");
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".jpg");
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".jpeg");
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".png");
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".tiff");
    sdf.ReadDirFiles(strDirSrc, &arrFiles, ".gif");

    sdf.CreateMuliteDirectory(strDirDst);
    for (int i = 0; i < arrFiles.GetCount(); ++i)
    {
        CString strDstFile = strDirDst + "\\" + sdf.GetNameOfFile(arrFiles[i], false) + strSuffix;
        ConvertOneImage(arrFiles[i], strDstFile);
    }

    return 0;
}