MFC BMP sets the resolution of bitmap, DPI is 600 points, and gdiplus generates labels

MFC Set up Bitmap The resolution of the DPI  ( Printers are generally 600 spot ) 

Retrieve the class identifier of the encoder - Win32 apps | Microsoft Docs

• image/bmp
• image/jpeg
• image/gif
• image/tiff
• image/png

#include <atlbase.h> 


using namespace Gdiplus;
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
}
BOOL checkBMPResolution(LPCTSTR  fileName, float dpi)
{
	// Initialize GDI+.
	GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);


	USES_CONVERSION;
	Gdiplus::Bitmap* pBitmap = new Gdiplus::Bitmap(T2W(fileName));
	if (pBitmap == NULL || pBitmap->GetLastStatus() != Gdiplus::Ok) { logger.ERROR_F(__FUNCTION__+to_string(__LINE__)+" error :" + to_string(pBitmap->GetLastStatus()));  delete pBitmap;	return FALSE; }

	if (pBitmap->GetHorizontalResolution() != dpi || pBitmap->GetVerticalResolution() != dpi)
	{
		logger.ERROR_F(" Horizontal resolution " + to_string(pBitmap->GetHorizontalResolution()) + " Or vertical resolution " + to_string(pBitmap->GetVerticalResolution()) + "  error , Should be " + to_string(dpi));
		delete pBitmap;
		return FALSE;
	}
	delete pBitmap;
	return TRUE;
}
BOOL setBMPResolution(LPCTSTR  fileName, float dpi)
{
	LPCTSTR outFileName = "temp.bmp";
	// Initialize GDI+.
	GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);


	USES_CONVERSION;
	Gdiplus::Bitmap* pBitmap = new Gdiplus::Bitmap(T2W(fileName));
	if (pBitmap==NULL || pBitmap->GetLastStatus() != Gdiplus::Ok) { logger.ERROR_F(" Error in resolution conversion :" + to_string(pBitmap->GetLastStatus()));  delete pBitmap;	return FALSE; }

	Gdiplus::Status status = pBitmap->SetResolution(dpi, dpi);// Set this  Bitmap  The resolution of the .
	if (status != Gdiplus::Ok) { logger.ERROR_F(" Turn resolution :" + to_string(status));  delete pBitmap;	return FALSE; }
	
	
	CLSID clsid;
	GetEncoderClsid(L"image/bmp", &clsid);				//Get the encoder
	status = pBitmap->Save(T2W(outFileName), &clsid);//Save the image into physical memory
	if (status != Gdiplus::Ok) { logger.ERROR_F(" After resolution conversion , Save error :" + to_string(status)); delete pBitmap;	return FALSE; }
	delete pBitmap;
	
	pipe_system("del "+ (CString)fileName+"\n"); //cmd Delete first 
	pipe_system("rename " + (CString)outFileName + " "+ fileName +"\n"); //cmd Rename to the original name 

	return TRUE;
}

void PrintBitmap(LPCTSTR filename)
{
	setBMPResolution(filename, 600);// To 600 The resolution of the 
	checkBMPResolution(filename,600); // Check for correctness 



   

}

Generate barcode label pictures （ Draw text on the template 、 Bar code, etc ） 

/**********************************************************************
*  Function name ：void GenBarCode(HDC hDC, int iL, int iT, int iB, CString csCode, int iStyle, int iMap);
*  ginseng    Count ：
*	hDC: Canvas handle 
*	iL： top left corner  X coordinate 
*	iT： top left corner  Y coordinate 
*	iB： Bar code height 
*	csCode： Bar code content 
*	iStyle： Bar code format 
*	iMap：
*  Return value ： nothing 
*  Sketch    Statement ： Draw the barcode to the specified HDC
**********************************************************************/
void GenBarCode(HDC hDC, int iL, int iT, int iB, CString csCode, int iStyle, int iMap, int iWidth)
{
	COLORREF clrBar = RGB(0, 0, 0);
	COLORREF clrSpace = RGB(255, 255, 255);
	int iPenW = 2;

	switch (iStyle)
	{
	case 0:
		{
			Barcode39 code;
			code.Encode39(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 1:
		{
			Barcode93 code;
			code.Encode93(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 2:
		{
			Barcode128 code;
			code.Encode128A(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 3: 
		{
			Barcode128 code;
			code.Encode128B(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 4: 
		{
			Barcode128 code;
			code.Encode128C(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 5: 
		{
			BarcodeI2of5 code;
			code.EncodeI2of5(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	case 6: 
		{
			BarcodeEan13 code;
			code.EncodeEan13(csCode);
			code.DrawBarcodeWidth(hDC, iL, iT, iB - 10, iB, clrBar, clrSpace, iPenW, iWidth);
		}
		break;
	default:
		break;
	}
}

// Generate barcode label pictures  （ Draw text on the template 、 Bar code, etc ） 
void generateDeviceLable(CString g_szTemplateName, CString sn, CString imei1, CString imei2)
{
	int height, width;
	CRect rect;// Define rectangle class 
	CRect rect1;
	CImage image; // Create picture class 

	// Import template   Automatically obtain width and height 
	image.Load(g_szTemplateName);
	if (image == NULL) {		logger.ERROR_F(" Template does not exist :"+string(g_szTemplateName));		return;	}
	//int bpp=image.GetBPP();//32


	height = image.GetHeight();
	width = image.GetWidth();
	HDC memDC = image.GetDC();
	RECT rectBmp = { 0,0,width, height };
	WORD iStyle = 2; //code128

	//630 640 
	DWORD barCodeSn_left = 71, barCodeSn_top = 440, barCodeSn_bottom = 440 + 102, barCodeSn_UN = 200;
	RECT rectTextSN = { 201, barCodeSn_bottom + 7, width - 201, barCodeSn_bottom + 7 + 45 };

	DWORD barCodeImei_left = barCodeSn_left, barCodeImei_top = rectTextSN.bottom + 18, barCodeImei_bottom = barCodeImei_top + 102, barCodeImei_UN = 200;
	RECT rectTextIMEI = { 201, barCodeImei_bottom + 7, width - 201,barCodeImei_bottom + 7 + 45 };

	DWORD barCodeImei_left2 = barCodeSn_left, barCodeImei_top2 = rectTextIMEI.bottom + 18, barCodeImei_bottom2 = barCodeImei_top2 + 102, barCodeImei_UN2 = 200;
	RECT rectTextIMEI2 = { 201, barCodeImei_bottom2 + 7, width - 201, barCodeImei_bottom2 + 7 + 45 };

	BYTE *bText = (BYTE*)new char[128];
	CFont font;
	font.CreateFont(54, // nHeight 
		35, // nWidth 
		0, // nEscapement 
		0, // nOrientation 
		FW_BOLD, // nWeight 
		FALSE, // bItalic 
		FALSE, // bUnderline 
		0, // cStrikeOut 
		ANSI_CHARSET, // nCharSet 
		OUT_DEFAULT_PRECIS, // nOutPrecision 
		CLIP_DEFAULT_PRECIS, // nClipPrecision 
		DEFAULT_QUALITY, // nQuality 
		VARIABLE_PITCH | FF_SWISS, // nPitchAndFamily 
		_T("Arial")); // lpszFac 

	SelectObject(memDC, font);
	SetBkMode(memDC, TRANSPARENT);


	// Draw bar code 
	GenBarCode(memDC, barCodeSn_left, barCodeSn_top, barCodeSn_bottom, sn, iStyle, 0, width - barCodeSn_left * 2);

	// Write number 
	memset(bText, 0x00, sizeof(bText));
	sprintf((char *)bText, "SN:%s", sn);
	DrawText(memDC, (LPCSTR)bText, -1, &rectTextSN, DT_VCENTER);


	// Draw bar code 
	GenBarCode(memDC, barCodeImei_left, barCodeImei_top, barCodeImei_bottom, imei1, iStyle, 0, width - barCodeSn_left * 2);

	// Write number 
	memset(bText, 0x00, sizeof(bText));
	sprintf((char *)bText, "IMEI1:%s", imei1);
	DrawText(memDC, (LPCSTR)bText, -1, &rectTextIMEI, DT_VCENTER);

	// Draw bar code 
	GenBarCode(memDC, barCodeImei_left2, barCodeImei_top2, barCodeImei_bottom2, imei2, iStyle, 0, width - barCodeSn_left * 2);

	// Write number 
	memset(bText, 0x00, sizeof(bText));
	sprintf((char *)bText, "IMEI2:%s", imei2);
	DrawText(memDC, (LPCSTR)bText, -1, &rectTextIMEI2, DT_VCENTER);
	
	

	image.ReleaseDC();
	DeleteObject(font);
	delete(bText);
	system("del BarCode.bmp"); // Delete first 
	image.Save("BarCode.bmp"); // The default resolution is 96
	image.Destroy();

	Gdiplus::Bitmap* pBitmap = new Gdiplus::Bitmap(L"BarCode.bmp");
	pBitmap->SetResolution(600, 600);// Set this  Bitmap  The resolution of the .

	CLSID jpgClsid;
	GetEncoderClsid(L"image/bmp", &jpgClsid);				//Get the encoder
	Gdiplus::Status status=pBitmap->Save(L"BarCode600.bmp", &jpgClsid);//Save the jpg image into physical memory
	if (status != Gdiplus::Ok) { logger.ERROR_F(" Save error :" + to_string(status)); return; }
}