How to draw unicode string using C# graphics.DrawString

Question

I'm trying to send khmer script(unicode) string to printer using PrintDocument provided by the .NET framework.

Unfortunately it seems to me that the Graphics.DrawString() does not render khmer script correctly.

Platform: Windows 7 Ultimate
IDE: VS 2010 Ultimate

Here is the sample code:

void printDoc_PrintPage(object sender, PrintPageEventArgs e)
{
  var font = new Font("Khmer UI", 12);
  var text = "សួស្តី"; // "Hello"
  e.Graphics.DrawString(text, font, Brushes.Black, 100, 100);
}

instead of displaying "សួស្តី" you would see "សួស្តី" — lchanmann
– lchanmann, Commented Nov 7, 2010 at 8:35

BeemerGuy · Accepted Answer · 2010-11-08 23:01:30Z

5

mann,
I tested your code on a Form_Paint() handler, and I got exactly what you said.
But when I used this instead:

TextRenderer.DrawText(e.Graphics, text, font, new Point(100, 100), Color.Black);

It gave me the text the way you wanted it.
Try that on your printDoc_PrintPage().

alt text

answered Nov 8, 2010 at 23:01

BeemerGuy

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7 Comments

lchanmann Over a year ago

That because Graphics class use GDI+ and TextRenderer class use GDI to do the rendering. Unfortunately TextRenderer class does not support for printing. msdn.microsoft.com/en-us/library/ms171753.aspx

Sopolin Over a year ago

Hi sir, I accept your recommend. But when I try your code, I am very difficult to set location in New Point(100,100). It means that can I set New Point as Milimeter of Document. Let say, I want to print on A4 paper. How can I print to the point that I want.

BeemerGuy Over a year ago

@Sopolin -- you'll have to calculate that. You need to convert millimeters into pixels. By default, there are 72 pixels per inch. There are 25.4mm per inch, which means the resolution is 72 pixels per 25.4mm. Therefore, for example, if you want to start drawing at 50mm, then you need to draw at pixel 142, as calculated by 50 * (72/25.4).

Sopolin Over a year ago

Thank you sir, but I still can't because I use Paper A4 to print text out. It shows different location, even though I print what you have guide me. Let say, I print (x,y) in milimeter (17,35) convert to pixels (x,y) (48,99). It doesn't print text to location on paper that I want.

BeemerGuy Over a year ago

@Sopolin -- Are you factoring in the margins of the paper? Make sure you don't have any margin settings there that shift your numbers over. And the question is, where does the (17,35) show? Too far to the bottom? Too far to the right? How much off is it?

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lchanmann · Accepted Answer · 2010-11-10 01:31:03Z

1

Thanks Albin and Beemer for your active response.

After a few posts in c# google group. It's been confirmed that there is a bug in GDI+ that incorrectly show certain script ("Khmer" in this case) to a different wording.

A native win32 test application was created to verify the issue with GDI+ DrawString().

A bug report has been submitted to Microsoft Connect: http://connect.microsoft.com/VisualStudio/feedback/details/620081/

answered Nov 10, 2010 at 1:31

lchanmann

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