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digitalmars.D.learn - to!string and windows programming

reply "Phil Lavoie" <maidenphil hotmail.com> writes:
Yo,

I am currently going through the much recommended book 
"Programming Windows" and experiencing some stuff. One of which 
was formatting the hInstance and prevHInstance into a string. 
WHICH CRASHES THE PROGRAM! I hope I am doing something wrong! 
Please scope the code below and let me know either the reason + 
workaround for this misbehaviour or what is my mistake!

import std.stdio;


version( Windows ) {
   import std.c.windows.windows;
   import std.string;
   import std.conv;

   extern( Windows )
   int WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR 
szCmdLine, int iCmdShow) {
     //size_t noInstance = cast( size_t )hInstance;
     void * vp = null;
     size_t noInstance = cast( size_t )vp;
     string noInstanceS = to!string( noInstance ); //This line 
crashes
     /*
     MessageBoxA(
       null,
       //toStringz( "HInstance: " ~ to!string( hInstance ) ~ 
"\nHPrevInstance: " ~ to!string( hPrevInstance ) ),
       toStringz( "Hello" ),
       toStringz( "HelloIsMe" ),
       0
     );
     */


     return 0;
   }

} else {
   import std.conv;

   void main( string[] args ) {
     void * vp = null;
     size_t vpInt = cast( size_t )vp;
     writeln( "VP: ", to!string( vpInt ) ); //Here it does not.
   }

}

Regards!

Phil
Dec 24 2012
parent reply Andrej Mitrovic <andrej.mitrovich gmail.com> writes:
On 12/24/12, Phil Lavoie <maidenphil hotmail.com> wrote:

 I am currently going through the much recommended book
 "Programming Windows" and experiencing some stuff. One of which
 was formatting the hInstance and prevHInstance into a string.


You need to initialize the runtime or you will get crashes as soon as
the GC allocates memory.

Note that many Programming Windows examples were translated into D and
you can find them here:
https://github.com/AndrejMitrovic/DWinProgramming

Here's an example how the runtime is initialized:
https://github.com/AndrejMitrovic/DWinProgramming/blob/master/Samples/Chap01/HelloMsg/HelloMsg.d

See the `Runtime.initialize(&exceptionHandler);` call.
Dec 24 2012
parent "Phil Lavoie" <maidenphil hotmail.com> writes:
On Monday, 24 December 2012 at 18:28:04 UTC, Andrej Mitrovic 
wrote:

 On 12/24/12, Phil Lavoie <maidenphil hotmail.com> wrote:

 I am currently going through the much recommended book
 "Programming Windows" and experiencing some stuff. One of which
 was formatting the hInstance and prevHInstance into a string.


 You need to initialize the runtime or you will get crashes as 
 soon as
 the GC allocates memory.

 Note that many Programming Windows examples were translated 
 into D and
 you can find them here:
 https://github.com/AndrejMitrovic/DWinProgramming

 Here's an example how the runtime is initialized:
 https://github.com/AndrejMitrovic/DWinProgramming/blob/master/Samples/Chap01/HelloMsg/HelloMsg.d

 See the `Runtime.initialize(&exceptionHandler);` call.


Wow buddy thanks for the accurate and most informative answer. I 
will be looking through those examples.

Thanks again!

Phil
Dec 24 2012