msg：传输失败提示。

ClientCore/FileTrans.cpp

@@ -332,6 +332,7 @@ void FileTrans::fbtCanotSend(QSharedPointer<FrameBuffer> frame)
     if (sendTask_->file.isOpen()) {
         sendTask_->file.close();
     }
+    sendTask_->state = TaskState::STATE_FAILED;
 }
 
 void FileTrans::fbtCanSend(QSharedPointer<FrameBuffer> frame)

Gui/Form/Transform.cpp

@@ -110,6 +110,7 @@ void TransForm::setProgress(double val)
 void TransForm::handleFailed()
 {
     ui->progressBar->setValue(0);
+    QMessageBox::information(this, tr("提示"), tr("传输失败"));
 }
 
 void TransForm::handleDone()