MFC读写EXIF信息，图片非占用

// ConsoleApplication2.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")   
int 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;
}
// 从内存加载图片，失败返回NULL
Bitmap* LoadBitmapFromMemory(const void* memory, DWORD size)
{
    Bitmap* bmp = NULL;
    IStream* stream = NULL;
    if (CreateStreamOnHGlobal(NULL, TRUE, &stream) == S_OK)
    {
        ULARGE_INTEGER uli;
        uli.QuadPart = size;
        stream->SetSize(uli);
        if (stream->Write(memory, size, NULL) == S_OK)
            bmp = new Bitmap(stream);
        stream->Release();
    }
    return bmp;
}
// 从文件加载图片，不独占文件，失败返回NULL
Bitmap* LoadBitmapFromFile(const TCHAR* file_name)
{
    Bitmap* bmp = NULL;
    HANDLE file_handle = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (file_handle != INVALID_HANDLE_VALUE)
    {
        DWORD temp = 0;
        DWORD file_size = GetFileSize(file_handle, &temp);
        if (file_size && !temp)  // 不处理大于4G的文件
        {
            // 将图片文件读到内存后，再从内存创建Bitmap
            unsigned char* buffer = new unsigned char[file_size];
            if (ReadFile(file_handle, buffer, file_size, &temp, NULL))
                bmp = LoadBitmapFromMemory(buffer, temp);
            delete [] buffer;
        }
        CloseHandle(file_handle);
    }
    return bmp;
}
int _tmain(int argc, _TCHAR* argv[])
{
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
    Status stat;
    CLSID  clsid;
    char   propertyValue[] = "Fake Photograph";
     Bitmap* bitmap = LoadBitmapFromFile(L"E:/sandbox/stone.jpg");
    PropertyItem* propertyItem = new PropertyItem;
    // Get the CLSID of the JPEG encoder.
    GetEncoderClsid(L"image/jpeg", &clsid);
    propertyItem->id = PropertyTagCopyright;
    propertyItem->length = 16;  // string length including NULL terminator
    propertyItem->type = PropertyTagTypeASCII; 
    propertyItem->value = propertyValue;
    bitmap->SetPropertyItem(propertyItem);
 
    stat = bitmap->Save(L"E:/sandbox/stone.jpg", &clsid, NULL);
    if(stat == Ok)
        printf("FakePhoto2.jpg saved successfully.\n");
    delete propertyItem;
    delete bitmap;
    GdiplusShutdown(gdiplusToken);
    return 0;
    return 0;
}