Problem writing out to a stream

[leinad]

Hi,

I'm trying to write out to a file using QTextStream and although it compiles and runs, nothing goes to the file. Can't seem to figure what I'm doing wrong. Here is a simplified version. The file does get created in the directory just nothing writes to it.

static QTextStream outStream; //keep the handle since we can go into the method multiple times
static bool once = false;

if(once == false)
{
once = true;
QDir someDir(logDir); //logDir = some director c:"\blah\blah
if(someDir.exists())
{
QString fileName = logDir + "/" + "myfileName";
QFile file(filename);
if (file.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
{
outStream.setDevice(&file);
}

}
}
Qstring someText = "blah blah";
outStream << someText << "\n";

Any help would be appreciated.

[leinad]

I tried closing the file and sure enough the data was logged to the file, so I tried using file.flush() and nothing was written to the file. Any ideas how to force the data to the file?

[Bonnie]

@leinad What about outStream.flush()?

[leinad]

Write, thanks. I saw in another thread to use both outsream.flush and Qfile.flush().

[KroMignon]

@leinad said in Problem writing out to a stream:

static QTextStream outStream; //keep the handle since we can go into the method multiple times

Why use static and not a class member?

[Bonnie]

@leinad I think outStream.flush() should also have called file->flush() inside it though.

[KroMignon]

@leinad said in Problem writing out to a stream:

This code cannot work!!

static QTextStream outStream;  //keep the handle since we can go into the method multiple times

Why static??? please use class member for this!

static bool once = false;

What this and not use outStream.device() != nullptr to check if stream has been initialized?

if(once == false)
{
    once = true;
    QDir someDir(logDir);  //logDir = some director c:"\blah\blah
    if(someDir.exists())
    {
       QString fileName = logDir + "/" + "myfileName";
       QFile file(filename);
       if (file.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
       {
           outStream.setDevice(&file);
       }
    }

==> After here file is destroyed and closed and outStream use an invalid QIODevice!

}
Qstring someText = "blah blah";
outStream << someText << "\n";