Thanks, I found the error.

How about returning the value as one of the out parameter...

Ok, I'll try to do this. If it's possibly, please send me to losqut@yandex.ru

Romiks wrote: I need it for my cross-platform application, which uses wxWidgets library I haven't tried it, but could you use the wxImage class to open the TIFF file and then save it as a BMP file?

Nelek wrote: can it work? Why not try it and see? "A good athlete is the result of a good and worthy opponent." - David Crow "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

This should do the task correctly.... CFileDialog FileDlg(TRUE,_T("file.ttt"),NULL,NULL,_T("ttt Files(*.ttt)|*.ttt||"),NULL ); Who am I? Do you know me....:omg:

AFAIK, CBitmapButton doesn't support transparent colors. You could derive a class from CBitmapButton, override the DrawItem() method, and draw the bitmaps yourself using transparency, perhaps with GDI+ or masked bitmaps. CBitmapButton uses BitBlt() to draw the bitmaps. An easier (IMO) approach would be to use a toolbar control. There you can use image list(s) which will handle transparency and true-color bitmaps easily. Mark "Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

If you have working dialog based project, could you please send me? my mail:losqut@yandex.ru As for me, buttons are not greyed :(

I'm not sure why this isn't working. Try breaking it down to see what part is actually causing the exception: CString hello("Hello"); gcroot<String ^> HelloStr = gcnew String(hello); gcroot<SqlConnection ^> m_SqlDbConnection = gcnew SqlConnection(HelloStr); The System.String constructor should be using the LPCTSTR operator of CString so I expect it should work. Mark "Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

It failed because the connection string you provided it, "Hello", isn't a valid description of what kind and which database you want to connect to. You might want to have a look at ConnectionStrings.com[^] for many examples of what connection strings for various databases are supposed to look like. My C++ is really rusty, but it loks like you need to back away from the database stuff for now and start by learning the basics of CLI before you jump into the deeper end of the .NET Pool. Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic      2006, 2007

Thanks a lot, the problem was resolved by adding the "Handles Obj.TotalMarks" at the end of Obj_TotalMarks subroutine definition: Private Sub Obj_TotalMarks(ByVal TotalMarks As Integer) Handles Obj.TotalMarks