c/c++语言开发共享qt实现读写二进制文件

		QFile file("D:\Tcpview.exe"); 		if (file.exists()) 		{ 			if ( file.size() > 2097152 ) 			{ 				QMessageBox::information(this, tr("up file fail"),  					tr("Failed to up file, file size need < 2M.")); 				return; 			} 			if(!file.open(QIODevice::ReadOnly)) 			{ 				QMessageBox::warning(this,tr("error"),tr("file no exit"),QMessageBox::Ok); 				return; 			} 			else 			{ 				//////////////////////////////////// 				//fstream fin; 				ifstream fin("D:\Tcpview.exe", ios::in | ios::binary); 				//fin.open(filename2.c_str()); 				if(!fin) 				{ 					cerr<<"open error!"<<endl; 					return; 				} 				int i = file.size(); 				QByteArray str = file.read(i);  //写 				//注意：不可使用string str = file.read(i);  //会被截断  				QFile file2("D:\Tcpview3.exe"); 				file2.open(QIODevice::WriteOnly); 				file2.write(str.data(), i); 				file2.close(); 			} 		} 

c/c++开发分享qt实现读写二进制文件地址：https://blog.csdn.net/qq_33053671/article/details/107388240