Конвертация из bmp в png

#include <windows.h>
#include <gdiplus.h>
#include <iostream>
#pragma comment(lib, "gdiplus")
 
using namespace Gdiplus;
 
//L"D:\\Visual Studio 2017\\_A Мои проекты\\PicZ\\PicZ\\Castle";
const wchar_t* pSrcFile = L"test.bmp";
const wchar_t* pDstFile = L"test.png";
 
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid);
 
int main()
{
    HWND hWnd = GetConsoleWindow();
 
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
 
    {
        Image image(pSrcFile);
        if (image.GetLastStatus() != Status::Ok)
            std::cout << "can't load image!" << std::endl;
 
        // Get the CLSID of the PNG encoder.
        CLSID encoderClsid;
        if (GetEncoderClsid(L"image/png", &encoderClsid) < 0)
            std::cout << "can't find encoder!" << std::endl;
 
        Status stat = image.Save(pDstFile, &encoderClsid, NULL);
        if (stat != Status::Ok)
            std::cout << "can't save image!" << std::endl;
        else
            std::cout << "OK" << std::endl;
    }
 
    GdiplusShutdown(gdiplusToken);
 
    system("pause");
    return 0;
}
 
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
    UINT  num = 0;          // number of image encoders
    UINT  size = 0;         // size of the image encoder array in bytes
 
    ImageCodecInfo* pImageCodecInfo = NULL;
 
    GetImageEncodersSize(&num, &size);
    if (size == 0)
        return -1;  // Failure
 
    pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
    if (pImageCodecInfo == NULL)
        return -1;  // Failure
 
    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;  // Success
        }
    }
 
    free(pImageCodecInfo);
    return -1;  // Failure
}