我正在尝试在c ++客户端和node.js服务器之间进行通信。我可以将数据发送到服务器,但我无法将任何消息发送回客户端。我对socket.emit的简单理解是它应该通过在基本的Windows消息循环中调用FD_READ消息上的recv()来发送可检索的消息。我可能会遗漏那些东西。
以下是相关的客户端代码:
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s == INVALID_SOCKET)
{
MessageBox(hwnd, TEXT("3"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
return 0;
}
long hostname = inet_addr("192.168.1.70");
target.sin_family = AF_INET;
target.sin_port = htons(server_port_num);
target.sin_addr.s_addr = hostname;
if (connect(s, (SOCKADDR *)&target, sizeof(target)) == SOCKET_ERROR)
{
MessageBox(hwnd, TEXT("999"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
return 0;
}
WSAAsyncSelect(s, hwnd, CUST_MSG, FD_READ | FD_CONNECT | FD_CLOSE);
我发送的数据是在服务器控制台上接收和输出的:
int nret = send(s, buffer, strlen(buffer), 0);
然后我尝试在接收数据的同一服务器事件中发回一些数据:
this.socket.on('data', function (buffer) {
try {
logger.warn(buffer + "\n");
socket.emit('message', 'psst, wanna buy some macaroni?');
//that.messageHandler(that, buffer);
} catch (err) {
logger.warn('Protocol ' + err + ' ' + that.socket.remoteAddress);
that.dispose();
}
});
我有一个消息循环,但它没有检测到从socket.emit()发送的消息:
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0)
{
if (numBytes > 0) {
wchar_t buffer[256];
wsprintfW(buffer, L"%d", numBytes);
MessageBox(hwnd, buffer, TEXT(""), MB_OK | MB_ICONEXCLAMATION);
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
//MESSAGE LOOP FUNCTION:
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) //handle the messages
{
case CUST_MSG: //Is a message being sent?
{
switch (lParam) //If so, which one is it?
{
case FD_ACCEPT:
MessageBox(hwnd, TEXT("accept"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
accept(wParam, NULL, NULL);
break;
case FD_CONNECT:
MessageBox(hwnd, TEXT("connect"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
break;
case FD_READ:
char buffer[80];
int byte_num;
memset(buffer, 0, sizeof(buffer));
byte_num = recv(wParam, buffer, sizeof(buffer) - 1, 0);
MessageBox(hwnd, TEXT("READING"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
numBytes += byte_num;
break;
case FD_CLOSE:
//MessageBox(hwnd, TEXT("close"), TEXT(""), MB_OK | MB_ICONEXCLAMATION);
break;
}
}
当我稍微更改程序并将数据从客户端发送到客户端时,相同的循环正确检测到消息。我已经尝试过使用bind(),listen(),recv(),但我无法使用node获取FD_READ消息。我试过在同一台计算机上运行的客户端和服务器,以及同一本地网络上的不同计算机。
答案 0 :(得分:-1)
要将数据写入Node.js中的套接字,请使用socket.write()
。
请参阅https://nodejs.org/api/net.html#net_socket_write_data_encoding_callback