I am using the following code to take a screenshot , compress it to jpg and save it. I am trying to compress the image more, e.g. from 200kb --> 100kb. Let's say about 60% of original quality. Could you guys, please help me find out how to do this?

#include "stdafx.h"
#include <windows.h>
#include <GdiPlus.h>
#include <string>

using namespace std;
#pragma comment( lib, "gdiplus" )
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid);

void gdiscreen(string save_path_s)
	using namespace Gdiplus;
	GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
		HDC scrdc, memdc;
		HBITMAP membit;
		scrdc = ::GetDC(0);
		int Height = GetSystemMetrics(SM_CYSCREEN);
		int Width = GetSystemMetrics(SM_CXSCREEN);
		memdc = CreateCompatibleDC(scrdc);
		membit = CreateCompatibleBitmap(scrdc, Width, Height);
		HBITMAP hOldBitmap =(HBITMAP) SelectObject(memdc, membit);
		BitBlt(memdc, 0, 0, Width, Height, scrdc, 0, 0, SRCCOPY);

		Gdiplus::Bitmap bitmap(membit, NULL);
		CLSID clsid;
		GetEncoderClsid(L"image/jpeg", &clsid);
		wstring save_path(save_path_s.length(), L' ');
		copy(save_path_s.begin(), save_path_s.end(), save_path.begin());

		bitmap.Save(save_path.c_str(), &clsid);

		SelectObject(memdc, hOldBitmap);





int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
	using namespace Gdiplus;
	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;
			return j;  // Success

	return 0;

void main()

Edited 5 Years Ago by Legend32A: n/a

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