//发送各种UDP广播消息
void Widget::sndMsg(MsgType type, QString srvaddr)
{
QByteArray data;
QDataStream out(&data, QIODevice::WriteOnly);
QString address = getIP();
/*向要发送的数据中写入信息类型type、用户名（使用getUsr()函数获取),
* 其中，type用于接收端区分信息类型，从而可以对不同类型的信息进行
* 不同的处理
*/
out << type << getUsr();
switch(type)
{
case Msg:
/* 对于普通的聊天消息Msg,首先判断发送的消息是否为空，如果为空，
* 则进行警告；然后向发送的数据中写入本机的IP地址和用户输入的
* 聊天信息文本
*/
if(ui->msgTxtEdit->toPlainText() == "")
{
QMessageBox::warning(0, tr("警告"), tr("发送内容不能为空"),
QMessageBox::Ok);
return;
}
out << address << getMsg();
ui->msgBrowser->verticalScrollBar()->setValue(
ui->msgBrowser->verticalScrollBar()->maximum());
break;
case UsrEnter:
//对于新用户加入UsrEnter，只是简单地向数据中写入IP地址
out << address;
break;
case UsrLeft:
//对于用户离开UsrLeft,不需要进行其他操作
break;
case FileName:
{
//对于发送文件名FileName和拒绝接受文件Refuse，这里先不进行处理，稍后添加
int row = ui->usrTblWidget->currentRow();
QString clntaddr = ui->usrTblWidget->item(row, 1)->text();
out << address << clntaddr << fileName;
break;
}
case Refuse:
{
out << srvaddr;
break;
}
}
udpSocket->writeDatagram(data, data.length(), QHostAddress::Broadcast, port);
}
void Widget::sndMsg(MsgType type, QString srvaddr)
{
QByteArray data;
QDataStream out(&data, QIODevice::WriteOnly);
QString address = getIP();
out << type << getUsr();
switch(type)
{
case Msg :
if (ui->msgTxtEdit->toPlainText() == "") {
QMessageBox::warning(0,tr("警告"),tr("发送内容不能为空"),QMessageBox::Ok);
return;
}
out << address << getMsg();
ui->msgBrowser->verticalScrollBar()->setValue(ui->msgBrowser->verticalScrollBar()->maximum());
break;
case UsrEnter :
out << address;
break;
case UsrLeft :
break;
case FileName : {
int row = ui->usrTblWidget->currentRow();
QString clntaddr = ui->usrTblWidget->item(row, 1)->text();
out << address << clntaddr << fileName;
break;
}
case Refuse :
out << srvaddr;
break;
}
udpSocket->writeDatagram(data,data.length(),QHostAddress::Broadcast, port);
}