[Qt-interest] How to print out widgets?

[M. Bashir Al-Noimi]

Oh please I just want a snippet. You gave me is a theoretically solution 
I and couldn't find any functions can do what you said. I spent more 
than 8 hours (I lost my mind now :'( ) and I didn't find any solution... 
just correct my snippet or wrote new one please (don't take about chunk 
now I want to make it works first):

QPrinter printer;

     printer.setPageSize(QPrinter::A4);

     printer.setResolution(600);

     QPrintDialog  print(&printer  ,  this);

     QPixmap  pixmap(printer.paperSize(QPrinter::DevicePixel).toSize());

     QPainter  painter(&pixmap);

     if(print.exec()==  QPrintDialog::Accepted)

     {

         ui->tableWidget->setFixedWidth(250);

         ui->tableWidget->render(&pixmap,  QPoint(100,  100));

         //I  know  this  wrong  line  but  I  can't  find  a  way  for  printing  pixmap

         painter.begin(&printer);

     }



On 15/06/2010 11:58 م, Jason H wrote:
> Oh dear, don't do that! You'll get a HUGE chunk of memory that you 
> don't need.
>
> 1. use render() to the pixmap, like you have.
> 2. then use QPrinter/QPrintDevice to draw the pixmap on the printer at 
> some coordinate (0,0?).  I believe you call this 'painter'
>
> Between 1 and 2, you might want to scale the pixmap to account for DPI 
> differences. (scaled(300/72.0))
>
> ------------------------------------------------------------------------
> *From:* M. Bashir Al-Noimi <admin at mbnoimi.net>
> *To:* Jason H <scorp1us at yahoo.com>
> *Cc:* qt-interest at trolltech.com
> *Sent:* Tue, June 15, 2010 6:25:16 PM
> *Subject:* Re: [Qt-interest] How to print out widgets?
>
> On 15/06/2010 06:02 م, Jason H wrote:
>> I would probably try not rendering directly to a printer, bu rather a 
>> pixmap, that is then scaled to the printer. It is likely that the 
>> drawing commands to the printer did not translate properly. Printers 
>> deal with bitmaps, text, or vectors, and there are numerous quirks to 
>> them. By capturing it as a pixmap first, you'll then load an image to 
>> the printer, rather than some mixed-mode rendering. I'd expect 
>> render() to try a combination of vectors and bitmaps. Also, 
>> coordinate spaces are different.
>>
>> So capture as an image, then print the image.
> I got you idea but I don't know how to print the image itself usual 
> widgets has render or print functions where images don't, so could you 
> please give a tiny snippet?
>
> PS.
> I looked into this issue in the archive and discoverd that all related 
> discussions threads not completed.
> I tried to use this but it's not working because painter does nothing 
> (I need some corrections):
> QPrinter printer;
>      printer.setPageSize(QPrinter::A4);
>      printer.setResolution(600);
>      QPrintDialog  print(&printer  ,  this);
>      QPixmap  pixmap(printer.paperSize(QPrinter::DevicePixel).toSize());
>      QPainter  painter(&printer);
>      if(print.exec()==  QPrintDialog::Accepted)
>      {
>          ui->statusBar->showMessage("printing  in  progress",  1000);
>          ui->tableWidget->setFixedWidth(250);
>          ui->tableWidget->render(&pixmap,  QPoint(100,  100));
>      }
>
>
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>> *From:* M. Bashir Al-Noimi <admin at mbnoimi.net>
>> *To:* qt-interest at trolltech.com
>> *Sent:* Tue, June 15, 2010 12:15:25 AM
>> *Subject:* [Qt-interest] How to print out widgets?
>>
>> Hi folks,
>>
>>
>> I tried to print out QTableWidget as shown below:
>>
>>
>> QPrinter printer;
>>
>>      printer.setPageSize(QPrinter::A4);
>>      QPrintDialog  print(&printer  ,  this);
>>      QPainter  painter(&printer);
>>      if(print.exec()==  QPrintDialog::Accepted)
>>      {
>>          ui->tableWidget->setFixedWidth(250);
>>          ui->tableWidget->render(&painter,  QPoint(100,  100));
>>      }
>>
>>
>> but it didn't print out anything and gave me the following error 
>> message instead:
>>
>>
>> QWin32PrintEngine::drawPixmap, StretchBlt failed (Not enough storage 
>> is available to process this command.)
>>
>> How I can fix this issue?
>>
>>
>>
>

-- 
Best Regards
Muhammad Bashir Al-Noimi
My Blog: http://mbnoimi.net

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