文件传输工具

通过发送udp广播消息将IP广播给其他开启该程序的局域网机器

收到的广播消息可以显示在IP地址列表中，点击IP地址可以自动填充到IP地址栏内

选择文件后点击发送可以发送给指定IP，并能在传输过程中显示进度

默认端口6001。目前不支持修改，修改端口会导致网络连接失败。

资源链接：https://download.csdn.net/download/codears/90117330?spm=1001.2014.3001.5503

界面比较简洁：

部分代码如下：
udp发送广播消息

void Client::SendUDPMsg() {int ret = 0;// 设置广播地址struct sockaddr_in client;memset(&client, 0, sizeof(client));client.sin_family = AF_INET;client.sin_port = htons(g_udpServerPort);client.sin_addr.s_addr = inet_addr("255.255.255.255");int len = sizeof(SOCKADDR);hostent* host = gethostbyname(g_serverHost.toStdString().c_str());QString msg = QString("broadcast|%1").arg(host->h_name);ret = sendto(m_udpClientSocket, msg.toStdString().c_str(), msg.length(), 0, (SOCKADDR*)&client, len);
}

udp接收消息：

void Client::RecvUDPMsg() {int ret = 0;struct sockaddr_in client;memset(&client, 0, sizeof(client));int len = sizeof(SOCKADDR);char buff[BUFF_SIZE] = {0};ret = recvfrom(m_udpServerSocket, buff, BUFF_SIZE, 0, (SOCKADDR*)&client, &len);QString host(inet_ntoa(client.sin_addr));if (m_localIPv4List.indexOf(host) == -1 && m_knownHosts.indexOf(host) == -1) {qDebug() << __FUNCTION__ << "new host:" << host;m_knownHosts.push_back(host);(static_cast<Work*>(m_pParent))->NewHost(host);} else {return;}
}

启动udp服务：

bool Client::StartUdpServer(NetworkParams& params) {QString host = params.serverIP;m_hostnm = gethostbyname(host.toStdString().c_str());if (m_hostnm != (struct hostent*)0) {qDebug() << __FUNCTION__ << "hostname:" << m_hostnm->h_addrtype << " addr:" << m_hostnm->h_name;}int ret = 0;if ((m_udpServerSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {return false;}int port = params.serverPort;memset(&m_sockAddr, 0, sizeof(m_sockAddr));m_sockAddr.sin_family = AF_INET;m_sockAddr.sin_port = htons(port);//m_sockAddr.sin_addr.S_un.S_addr= inet_addr(host.toStdString().c_str());m_sockAddr.sin_addr.s_addr = INADDR_ANY;ret = bind(m_udpServerSocket, (const struct sockaddr*)&m_sockAddr, sizeof(m_sockAddr));if (ret < 0) {return false;} else {}GetIPv4List();return true;
}

启动tcp服务用于接收文件和发送文件：

bool Client::StartTcpServer(NetworkParams& params) {if (!m_bSocketClosed) {return true;}QString host = params.serverIP;m_hostnm = gethostbyname(host.toStdString().c_str());if (m_hostnm != (struct hostent*)0) {qDebug() << __FUNCTION__ << "hostname:" << m_hostnm->h_addrtype << " addr:" << m_hostnm->h_name;}int ret = 0;if ((m_tcpServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {return false;}int port = params.serverPort;memset(&m_sockAddr, 0, sizeof(struct sockaddr_in));m_sockAddr.sin_family = AF_INET;m_sockAddr.sin_addr.s_addr = INADDR_ANY;m_sockAddr.sin_port = htons(port);ret = bind(m_tcpServerSocket, (const struct sockaddr*)&m_sockAddr, sizeof(m_sockAddr));if (ret < 0) {return false;} else {qDebug() << __FUNCTION__ << "bind success port:" << port;}if (listen(m_tcpServerSocket, 512)) {return false;}return true;
}

通过tcp发送文件：

bool Client::SendFile(QString strFullFilePath, QString strUserName) {if (strFullFilePath.isEmpty() || strUserName.isEmpty()) {return false;}strFullFilePath = strFullFilePath.replace("\\", "/");QString fileName = strFullFilePath.mid(strFullFilePath.lastIndexOf("/") + 1);QFile f(strFullFilePath);if (!f.exists()) {return false;}if (!f.open(QIODevice::ReadOnly)) {return false;}f.seek(SEEK_SET);quint64 fileSize = f.size();char chBuff[BUFF_SIZE] = {0};memset(chBuff, 0, BUFF_SIZE);QString s = QString("upload|%1|%2|%3|donotremove").arg(fileName).arg(fileSize).arg(strUserName);strcpy(chBuff, s.toStdString().c_str());send(m_iClientSocket, chBuff, strlen(chBuff) + 1, 0);quint64 sendSize = 0;NetworkParams params;params.totalSize = fileSize;while (sendSize < fileSize) {memset(chBuff, 0, BUFF_SIZE);qint64 iRead = f.read(chBuff, BUFF_SIZE);if (iRead < 0) {f.close();return false;}int iSend = send(m_iClientSocket, chBuff, iRead, 0);if (iSend < 0) {f.close();return false;}int temp = iRead;while (iSend < temp) {iSend = send(m_iClientSocket, chBuff + iSend, temp - iSend, 0);if (iSend < 0) {f.close();return false;}temp = temp - iSend;}sendSize += iSend;f.seek(sendSize);params.recved = sendSize;(static_cast<Work*>(m_pParent))->UpdateProgress(params);}f.close();closesocket(m_iClientSocket);m_bSocketClosed = true;
}

通过tcp接收文件：

bool Client::RecvFile() {SOCKET clientSock = NULL;struct sockaddr in_addr = {0};int addrLen = sizeof(in_addr);clientSock = accept(m_tcpServerSocket, (struct sockaddr*)&in_addr, &addrLen);if (clientSock == SOCKET_ERROR) {return false;}ssize_t len = 0;char buff[BUFF_SIZE] = {0};len = recv(clientSock, buff, sizeof(buff), 0);//1. get filename and client ipif (len <= 0) {return false;}QString fileNameAndClientIP(buff);//upload|filename|filesize|hostnameQStringList sl = fileNameAndClientIP.split("|");if (sl.length() < 3) {return false;}QString fullFilePath = APPLICATION_DIR + "/" + sl.at(3);QDir d(fullFilePath);if (!d.exists()) {if (!d.mkdir(fullFilePath)) {((Work*)m_pParent)->WarnMsg(QString("创建目录[%1]失败").arg(fullFilePath));return false;}}qlonglong fileSize = sl.at(2).toLongLong();QString fullName = fullFilePath + "/" + sl.at(1);QFile f(fullName);if (!f.open(QFile::ReadWrite)) {((Work*)m_pParent)->WarnMsg(QString("打开文件:%1失败").arg(fullName));return false;}qlonglong recvLen = 0;NetworkParams params;params.totalSize = fileSize;while (recvLen < fileSize) {memset(buff, 0, sizeof(buff));len = recv(clientSock, buff, sizeof(buff), 0);if (len <= 0) {break;}recvLen += len;f.write(buff, len);params.recved = recvLen;(static_cast<Work*>(m_pParent))->UpdateProgress(params);}f.close();closesocket(clientSock);(static_cast<Work*>(m_pParent))->ReceivedFile(fullName);
}