[GD-Windows] Mind numbing GetOpenFileName Problem

[Paul C. <pa...@pa...>]

All I want is an open file dialog box, but no, windows has to cause me
problems.  Ok, its probably a silly mistake but here goes.
I'm compiling with both these flags set:
#define _WIN32_WINNT 0x500
#define WINVER 0x500

to try and get various things (mousewheel, ...) to co-operate.  The problem
comes when I try and open a file dialog.  The code is below.  The

sticking point appears to be the ofn.lStructSize line.  When set using the
VERSION_400 flag is fails gracefully with CDERR_STRUCTSIZE.  If I use

sizeof( OPENFILENAME ) it just crashes in the kernel on GetOpenFileName.
This should be really simple to get up and running, but I don't know how

get out of this hole I seem to have dug.  With no error message, useful or
otherwise, I'm a bit stuck.

(I apologise for the crap formatting but outlook express has decided to put
double carriage returns everywhere - go figure).

cheers

Paul

char inputfile[256], outputfile[256], filename[256];
char initdir[] = "d:\\Projects\\Clearday\\Data/0";
char title[] = "Select file to process/0";


OPENFILENAME ofn;
ofn.lStructSize = sizeof( OPENFILENAME_SIZE_VERSION_400 );  // =
izeof( OPENFILENAME );
ofn.hwndOwner = hWnd;
char *filter = "Max ASE files/0*.ASE/0/0";
ofn.lpstrFilter = NULL;
ofn.lpstrCustomFilter = NULL;
ofn.lpstrFile = inputfile;
ofn.nMaxFile = 256;
ofn.lpstrFileTitle = filename;
ofn.nMaxFileTitle = 256;
ofn.lpstrInitialDir = NULL;
ofn.lpstrTitle = NULL;
ofn.Flags = ( OFN_ENABLESIZING | OFN_FILEMUSTEXIST );

if( GetOpenFileName( &ofn )!=0 )
{
    _world.PreProcess( type, inputfile, outputfile );
}
else
{
    DWORD err = CommDlgExtendedError();
    if( err == CDERR_STRUCTSIZE )
    {
        int a = 1;
    }
}