MinGW/C++使用WinInet函数send()和recv()异常

[Toxic_Obsidian]

服务端代码：

	WSADATA	wsaData;
	WSAStartup( MAKEWORD(2,2) , &wsaData );
	SOCKET cli , ser;
	SOCKADDR_IN sera , clia;
	int clin = sizeof( SOCKADDR );

	ZeroMemory( &sera , sizeof(sera) );
	ZeroMemory( &clia , sizeof(clia) );
	sera.sin_family = AF_INET;
	sera.sin_port = htons( 10080 );
	sera.sin_addr.S_un.S_addr = ADDR_ANY;
	ser = socket( AF_INET , SOCK_STREAM , 0 );
	if( ser == INVALID_SOCKET ){
		cout << "Cannot init socket!\n";
		return 0;
	}
	if( 0 != bind( ser , (SOCKADDR*)(&sera) , sizeof(SOCKADDR) ) ){
		cout << "Cannot bind!\n";
		printf("Error code:%d\n",WSAGetLastError());
		closesocket( ser );
		return 1;
	}
	if( 0 != listen( ser , 5 ) ){
		cout << "Cannot listen!\n";
		printf("Error code:%d\n",WSAGetLastError());
		closesocket( ser );
		return 1;
	}

	const char wav[] = "Hello Client!";
	char* rwav = new char[sizeof(wav)];
	ZeroMemory( rwav , sizeof(wav) );
	cli = accept( ser , (SOCKADDR*)(&clia) , &clin );
	if( cli == INVALID_SOCKET ){
		cout << "Cannot init acc-socket!\n" << "Error code:";
		printf( "0x%x" , WSAGetLastError() );
		closesocket( ser );
		return 1;
	}
	cout << "Prepared for transmitting!\nsizeof(wav)=" << sizeof(wav) << endl;
	if( SOCKET_ERROR == send( cli , wav , sizeof(wav) , 0 ) ){
		cout << "Failed to send!\n";
		printf("Error code:%d\n",WSAGetLastError());
		closesocket( ser );
		closesocket( cli );
		return 1;
	}

	int rcvnum;
	rcvnum = recv( cli , rwav , sizeof(wav) , 0 );
	if( rcvnum != sizeof(wav) ){
		if( rcvnum <= 0 ){
			cout << "Error occurred:" << rcvnum << endl;
			return 1;
		}
		else{
			cout << "Length not enough:" << rcvnum << endl;
			return 1;
		}
	}
    cout << "Client returned:" << rwav << endl;

    getch();
	delete[] rwav;
	closesocket( cli );
	closesocket( ser );
	WSACleanup();

客户端代码：

	WSADATA wsaData;
	WSAStartup( MAKEWORD(2,2) , &wsaData );
	SOCKET ser;
	SOCKADDR_IN sera;
	ser = socket( AF_INET , SOCK_STREAM , 0 );

	ZeroMemory( &sera , sizeof(sera) );
	sera.sin_family = AF_INET;
	sera.sin_port = htons( 10080 );
	sera.sin_addr.S_un.S_addr = inet_addr( "127.0.0.1" );

	if( 0 != connect( ser , (SOCKADDR*)(&sera) , sizeof(SOCKADDR) ) ){
		cout << "Cannot connect to server!\n";
		printf("Error code:%d\n",WSAGetLastError());
		return 1;
	}

	//					"Hello Server!"
	const char* wav = 	"Hello Server!";
	char* rwav = new char[sizeof(wav)];
	ZeroMemory( rwav , sizeof(wav) );
	recv( ser , rwav , sizeof(wav) , 0 );
	cout << "Server sent:" << rwav;
	getchar();

	send( ser , wav , sizeof(wav) , 0 );

	getch();
	delete[] rwav;
	WSACleanup();

现在出现了比较诡异的场面。。。
服务端收到客户端发来的信息是前4字节，后面没有收到（recv()返回值是4）
客户端收到服务端发来的信息是不定前n字节+一串乱码（没有显示recv了多少个，但后面乱码到最后一个NULL时停止了）

如图
求各位大虾支招啊！

[小猪jazzy]

你的客户端指针使用的sizeof（wav）返回就是4，与服务端有区别，就是这个问题 const char* wav = "Hello Server!"; char* rwav = new char[sizeof(wav)]; ZeroMemory( rwav , sizeof(wav) ); recv( ser , rwav , sizeof(wav) , 0 ); cout << "Server sent:" << rwav; getchar(); send( ser , wav , sizeof(wav) , 0 );

[Toxic_Obsidian]

引用 1 楼 weixin_39913932 的回复:

你的客户端指针使用的sizeof（wav）返回就是4，与服务端有区别，就是这个问题 const char* wav = "Hello Server!"; char* rwav = new char[sizeof(wav)]; ZeroMemory( rwav , sizeof(wav) ); recv( ser , rwav , sizeof(wav) , 0 ); cout << "Server sent:" << rwav; getchar(); send( ser , wav , sizeof(wav) , 0 );

感谢您，但我现在又有个问题。 为是什么把const char* wav改成const char wav[]就能返回正常的sizeof(wav)=14而不是sizeof(wav)=4

[小猪jazzy]

这个是类型判断，原来类型是char *，现在类型时char 【14】，指针与char[14]大小当然不同