Update BatchDecode.cpp

Author: ywjywjywj528

samples/C++/Performance/BatchDecode/BatchDecode.cpp

@@ -30,7 +30,16 @@ char *stdin_get_str(char *str, int len)
 }
 int main(int argc, char* argv[])
 {
-
+	char szErrorMsg[256];
+    	// 1.Initialize license.
+  	// The string "DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9" here is a free public trial license. Note that network connection is required for this license to work.
+  	// If you don't have a license yet, you can request a trial from https://www.dynamsoft.com/customer/license/trialLicense?product=dbr&utm_source=samples&package=c_cpp 
+   	int errorCode = dynamsoft::dbr::CBarcodeReader::InitLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9", szErrorMsg, 256);
+	if (errorCode != DBR_OK)
+	{
+		std::cout << szErrorMsg << endl;
+	}
+	
 	CDbrBarcodeFileReader *barcodeFileReader = new CDbrBarcodeFileReader();
 
 	if (argc >= 3 && argc%2==1)