dongzhou5344
2010-08-28 20:44
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为何打印机会改变分辨率？ 用户，背景，什么？

I am runing a .bat file from a php using exec on a Windwos php server, where php is run using fast-cgi (and nginx). The command line to run this script is 

  pclose(popen("start / ". $cmd, "r"));

Where $cmd is somethign like "mybatfile.bat 45 1"

When I run the batch file manually it runs a python program to read a database, get hold of some data, and print a little report. And it all works 100% correctly.

When it is run from the web page, the report comes out, so I know the program is run. The code logs the parameters passed. I know that the call is correct.

When run from the server/web page the report appears on the same printer approx 20% larger that when run from the coammnd line.

The python script uses PyQt and opens the printer in native mode.

The code is 

    self.printer = QPrinter()
    self.printer.setPrinterName(printer)
    self.printer.setPageSize(QPrinter.A5)
    self.printer.setOrientation(QPrinter.Portrait)
    self.painter = QPainter(self.printer)

Does anyone know why this happens - and what can I do to correct it?

O/S is windows 7 (64 bit) for developement and a Server version for production. Python 2.7 32 bit. QT version 4.

Thanks Ian

图片转代码服务由CSDN问答提供 功能建议

我在Windwos php服务器上使用exec从php运行.bat文件，其中php使用快速运行 -cgi（和nginx）。 运行此脚本的命令行是 

  pclose（popen（“start /”。$ cmd，“r”））;  
   
 
 
其中$ cmd是某些东西，如“mybatfile.bat 45 1” 
 
 
当我手动运行批处理文件时，它会运行 一个python程序来读取数据库，获取一些数据，并打印一个小报告。 这一切都正确地100％正常工作。   
 
 
从网页运行时，报告出来，所以我知道程序已运行。 代码记录传递的参数。 我知道呼叫是正确的。 
 
 
从服务器/网页运行时，报告显示在同一打印机上，比从coammnd线运行时大20％。   
 
 
 python脚本使用PyQt并以纯模式打开打印机。   
 
 
代码是 
 
 
  self.printer = QPrinter（）
 self.printer.setPrinterName（printer）
 self.printer  .setPageSize（QPrinter.A5）
 self.printer.setOrientation（QPrinter.Portrait）
 self.painter = QPainter（self.printer）
   
 
 
有没有人 知道为什么会这样 - 我能做些什么来纠正它？   
 
 
 O / S是用于开发的Windows 7（64位）和用于生产的服务器版本。  
Python 2.7 32位。  
QT版本4.  
 
 
谢谢
Ian
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1条回答 默认 最新

  • dongza5150 2010-08-29 15:21
    最佳回答

    Cracked it! The user who is running the server has never logged in (naturally) so they have never changed their screen resolution from 90 dpi.

    I on the other hand, have changed by screen resolution because I use large fonts. So when I ran the print it printed in 120 dpi. When the server ran it, it printed in 90 dpi.

    Solution.

    After opening the printer, read the actual resolution back, and compute a scale factor.

    Use the scale factor for all layout and positioning - except font sizes in points which will be correct anyway.

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