c#代码：

[DllImport("ocr_cpu_ov.dll", CallingConvention = CallingConvention.Cdecl)]
extern static int det_base64(string in_pixels64);


Bitmap bmp = new Bitmap(@imagePath);
MemoryStream ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); // 注意这里的图片类型
byte[] arr = ms.ToArray(); // 使用ToArray()来简化代码
string base64Str = Convert.ToBase64String(arr);


rst = infer_base64(base64Str);

c++代码：

extern "C" OCRDLL_API int det_base64(const char* in_pixels64);


OCRDLL_API int infer_base64(const char* in_pixels64) {
	try {
		std::string imagebase64(in_pixels64);
		std::string decodedImage = base64_decode(imagebase64);

		std::vector<uchar> data(decodedImage.begin(), decodedImage.end());
		cv::Mat img = cv::imdecode(data, cv::IMREAD_COLOR);
	}
	catch (const std::exception& e) {
		std::cerr << "Error: " << e.what() << std::endl;
	}

	return 0;
}