[Mono-list] Qt C# bindings and a simple HelloWorld

Jonathan Pryor jonpryor@vt.edu
04 Feb 2002 21:39:06 -0500

I would suggest not changing the name of the method itself, as this will
require changes to any source code that uses the method whenever the
name mangling changes.

A better approach would be to use the EntryPoint attribute to specify
the actual exported name:

	[DllImport("libqt.so.2", EntryPoint="@qt_new_QApplication@")]
	public static extern Object qt_new_QApplication (
		int argc, string[] argv);

Then, you could use `nm' and a `sed' script to replace
"@qt_new_QApplication@" with the appropriately mangled entrypoint.


 - Jon

On Mon, 2002-02-04 at 21:04, Adam Treat wrote:
> So I've been mucking about for a bit with some c-sharp bindings to the 
> qt-toolkit.  I've been successful with a generic helloworld program.  I think 
> I am ready to begin generating some bindings in earnest after a few problems 
> are solved:
> 1.  Not sure how to handle Slots and Signals.  (biggest problem) ;)
> 2.  I have been using the qtc bindings from kde3 in the pinvoke statements. I 
> would like to stop using the libqtc library and just dllimport from libqt but 
> the name mangling (see http://www.delorie.com/gnu/docs/gcc/gxxint_15.html) is 
> going to have to be accounted for.  Thinking about writing a tool that will 
> automatically mangle the dllimport statement.  ie:
> 	From:
> 	[DllImport("libqtc.so.1.0.0")]
> 	public static extern Object qt_new_QApplication(int argc, string[] argv);
> 	To:
> 	[DllImport("libqt.so.2")]
> 	public static extern Object __12QApplicationRiPPc(int argc, string[] argv);
> 3.  I don't know how to use kalyptus (don't know perl) and I am a frankly 
> little frightened to go in that direction...  Thinking about using the kdoc 
> html output and generating the bindings from that, similar to what the intel 
> guys did with the ECMA documentation to c# stubs...  Richard, Miguel, Mike do 
> you have some suggestions on the best way to proceed?
> Well tell me what you think.
> Adam
> P.S.  I am primarly a java programmer, with little experience in qt, c++, or 
> c.  This is an exercise to hopefully do something useful and allow me to 
> learn a little so feel free to offer up some pointers ;)
> // qt_HelloWorld.cs - qt-csharp Hello World
> namespace QtSamples {
> 	using Qt;
> 	using System;
> 	public class qt_HelloWorld {
> 		public static int Main (string[] args)
> 		{
> 			QApplication a = new QApplication(args);
> 			QPushButton hello = new QPushButton("Hello world!", 0);
> 			hello.resize(100, 30);
> 			a.setMainWidget(hello);
> 			hello.show();
> 			return a.exec();
> 		}
> 	}
> }