Void executes differently if called from other file.

[Q139]

If called void from same file all executes , if called from other file signals and slots wont direct further executions.
void is in qt http downloader example.
"download.cpp here.":http://www.bogotobogo.com/Qt/Qt5_QNetworkRequest_Http_File_Download.php
httpdownload.cpp under link and there is void being called, void executes but further signal , slots fail.

calling fvoid from other ui .cpp file
@
void MainWindow::on_pushButton_clicked()
{
uurl = ui->lineEdit->text();

HttpWindow obj;

obj.downloadFile();

ui->label_14->setNum(failed1);//2

ui->label_9->setNum(finished1);
}@

[SGaist]

Hi,

What is "void" ?

[Q139]

Hi, this program uses http downloader example from qt but trying to control from other ui.

@void HttpWindow::downloadFile()
{

url = uurl; //**********1



QFileInfo fileInfo(url.path());//**********2
QString fileName = fileInfo.fileName();//**********3
if (fileName.isEmpty())//**********4
    fileName = "INDEXX.html";  //**********5

/* if (QFile::exists(fileName)) {
if (QMessageBox::question(this, tr("HTTP"),
tr("There already exists a file called %1 in "
"the current directory. Overwrite?").arg(fileName),
QMessageBox::Yes|QMessageBox::No, QMessageBox::No)
== QMessageBox::No)
return;

}*/

QFile::remove(fileName);//**********6

file = new QFile(fileName);//**********7
if (!file->open(QIODevice::WriteOnly)) {//**********8
    QMessageBox::information(this, tr("HTTP"),
                             tr("Unable to save the file %1: %2.")
                             .arg(fileName).arg(file->errorString()));
    delete file;
    file = 0;
    return;
}

progressDialog->setWindowTitle(tr("HTTP"));//**********9
progressDialog->setLabelText(tr("Downloading %1.").arg(fileName));//3//**********10
downloadButton->setEnabled(false);//**********11

// schedule the request
httpRequestAborted = false;//**********12
startRequest(url);  //1//**********13

}@

Code fails if called form other file,fail at lines below, if called from same file no problems.
@
void HttpWindow::startRequest(QUrl url)
{
reply = qnam.get(QNetworkRequest(url));//4//**********14
connect(reply, SIGNAL(finished()),
this, SLOT(httpFinished()));//**********15
connect(reply, SIGNAL(readyRead()),
this, SLOT(httpReadyRead()));//**********16
connect(reply, SIGNAL(downloadProgress(qint64,qint64)),
this, SLOT(updateDataReadProgress(qint64,qint64)));//**********17
}@
Those lines execute but no signals return.
If called from same file signals work.

[SGaist]

[quote author="Q139" date="1425070810"]
calling fvoid from other ui .cpp file
@
void MainWindow::on_pushButton_clicked()
{
uurl = ui->lineEdit->text();

HttpWindow obj;

obj.downloadFile();

ui->label_14->setNum(failed1);//2

ui->label_9->setNum(finished1);
}<< here obj is destroyed so it doesn't complete anything@

[/quote]

See my comment in your quoted code.

If you want to call your download code from several places, you should rather create an object dedicated to that task

[Q139]

Thanks alot for your knowledge.
Half day tryed many combinations but never touched symbols.

[SGaist]

You're welcome !

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