使用cv::putText在图片上打印中文出现？？？？
解决方法：
1.首先putText不支持在图片上输出中文，因此不能使用这个API
2.确定相关编码


3.转码UTF8转GBK

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std::string UTF8ToGBK(const std::string& strUTF8)
{int len = MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, NULL, 0);
    WCHAR* wszGBK = new WCHAR[len + 1];
    memset(wszGBK, 0, len * 2 + 2);
    MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)(LPCTSTR)strUTF8.c_str(), -1, wszGBK, len);

    len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
    char* szGBK = new char[len + 1];
    memset(szGBK, 0, len + 1);
    WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, szGBK, len, NULL, NULL);
    std::string strTemp(szGBK);
    delete[]szGBK;
    delete[]wszGBK;
    return strTemp;
}

4.使用自定义函数实现
putText.cpp

#include "putText.h"

void GetStringSize(HDC hDC, const char* str, int* w, int* h)
{SIZE size;
	GetTextExtentPoint32A(hDC, str, strlen(str), &size);
	if (w != 0) *w = size.cx;
	if (h != 0) *h = size.cy;
}

void putTextHusky(Mat& dst, const char* str, Point org, Scalar color, int fontSize, const char* fn, bool italic, bool underline)//后俩参数：斜体，下划线
{CV_Assert(dst.data != 0 && (dst.channels() == 1 || dst.channels() == 3));

	int x, y, r, b;
	if (org.x >dst.cols || org.y >dst.rows) return;
	x = org.x< 0 ? -org.x : 0;
	y = org.y< 0 ? -org.y : 0;

	LOGFONTA lf;
	lf.lfHeight = -fontSize;
	lf.lfWidth = 0;
	lf.lfEscapement = 0;
	lf.lfOrientation = 0;
	lf.lfWeight = 5;
	lf.lfItalic = italic;   //斜体
	lf.lfUnderline = underline; //下划线
	lf.lfStrikeOut = 0;
	lf.lfCharSet = DEFAULT_CHARSET;
	lf.lfOutPrecision = 0;
	lf.lfClipPrecision = 0;
	lf.lfQuality = PROOF_QUALITY;
	lf.lfPitchAndFamily = 0;
	strcpy_s(lf.lfFaceName, fn);

	HFONT hf = CreateFontIndirectA(&lf);
	HDC hDC = CreateCompatibleDC(0);
	HFONT hOldFont = (HFONT)SelectObject(hDC, hf);

	int strBaseW = 0, strBaseH = 0;
	int singleRow = 0;
	char buf[1<< 12];
	strcpy_s(buf, str);
	char* bufT[1<< 12];  // 这个用于分隔字符串后剩余的字符，可能会超出。
	//处理多行
	{int nnh = 0;
		int cw, ch;

		const char* ln = strtok_s(buf, "\n", bufT);
		while (ln != 0)
		{	GetStringSize(hDC, ln, &cw, &ch);
			strBaseW = max(strBaseW, cw);
			strBaseH = max(strBaseH, ch);

			ln = strtok_s(0, "\n", bufT);
			nnh++;
		}
		singleRow = strBaseH;
		strBaseH *= nnh;
	}

	if (org.x + strBaseW< 0 || org.y + strBaseH< 0)
	{SelectObject(hDC, hOldFont);
		DeleteObject(hf);
		DeleteObject(hDC);
		return;
	}

	r = org.x + strBaseW >dst.cols ? dst.cols - org.x - 1 : strBaseW - 1;
	b = org.y + strBaseH >dst.rows ? dst.rows - org.y - 1 : strBaseH - 1;
	org.x = org.x< 0 ? 0 : org.x;
	org.y = org.y< 0 ? 0 : org.y;

	BITMAPINFO bmp = {0 };
	BITMAPINFOHEADER& bih = bmp.bmiHeader;
	int strDrawLineStep = strBaseW * 3 % 4 == 0 ? strBaseW * 3 : (strBaseW * 3 + 4 - ((strBaseW * 3) % 4));

	bih.biSize = sizeof(BITMAPINFOHEADER);
	bih.biWidth = strBaseW;
	bih.biHeight = strBaseH;
	bih.biPlanes = 1;
	bih.biBitCount = 24;
	bih.biCompression = BI_RGB;
	bih.biSizeImage = strBaseH * strDrawLineStep;
	bih.biClrUsed = 0;
	bih.biClrImportant = 0;

	void* pDibData = 0;
	HBITMAP hBmp = CreateDIBSection(hDC, &bmp, DIB_RGB_COLORS, &pDibData, 0, 0);

	CV_Assert(pDibData != 0);
	HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);

	//color.val[2], color.val[1], color.val[0]
	SetTextColor(hDC, RGB(255, 255, 255));
	SetBkColor(hDC, 0);
	//SetStretchBltMode(hDC, COLORONCOLOR);

	strcpy_s(buf, str);
	const char* ln = strtok_s(buf, "\n", bufT);
	int outTextY = 0;
	while (ln != 0)
	{TextOutA(hDC, 0, outTextY, ln, strlen(ln));
		outTextY += singleRow;
		ln = strtok_s(0, "\n", bufT);
	}
	uchar* dstData = (uchar*)dst.data;
	int dstStep = dst.step / sizeof(dstData[0]);
	unsigned char* pImg = (unsigned char*)dst.data + org.x * dst.channels() + org.y * dstStep;
	unsigned char* pStr = (unsigned char*)pDibData + x * 3;
	for (int tty = y; tty<= b; ++tty)
	{unsigned char* subImg = pImg + (tty - y) * dstStep;
		unsigned char* subStr = pStr + (strBaseH - tty - 1) * strDrawLineStep;
		for (int ttx = x; ttx<= r; ++ttx)
		{	for (int n = 0; n< dst.channels(); ++n) {		double vtxt = subStr[n] / 255.0;
				int cvv = vtxt * color.val[n] + (1 - vtxt) * subImg[n];
				subImg[n] = cvv >255 ? 255 : (cvv< 0 ? 0 : cvv);
			}

			subStr += 3;
			subImg += dst.channels();
		}
	}

	SelectObject(hDC, hOldBmp);
	SelectObject(hDC, hOldFont);
	DeleteObject(hf);
	DeleteObject(hBmp);
	DeleteDC(hDC);
}

putText.h

#ifndef PUTTEXT_H_
#define PUTTEXT_H_

#include#include#includeusing namespace cv;
  
void GetStringSize(HDC hDC, const char* str, int* w, int* h);
void putTextHusky(Mat& dst, const char* str, Point org, Scalar color, int fontSize,
	const char* fn = "Arial", bool italic = false, bool underline = false);

#endif // PUTTEXT_H_```

最终代码

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