Handle of a Bitmap

[Sumit Rajan]

Greetings,

If I created a bitmap using:

Bitmap b = new Bitmap(50, 50);

And if I needed to get the handle associated with this bitmap (hWnd, I need
to do this because a function that I cannot touch requires it), how should I
go about doing this?

I would be extremely grateful if someone could help me out with this one.

Regards,
Sumit.

 

[Marc Gravell]

Not sure, but you could try GetHbitmap - however, I suspect that this will
be a clone - i.e. the second method won't be able to update the original.

Marc

 

[Sumit Rajan]

Not sure, but you could try GetHbitmap - however, I suspect that this will
be a clone - i.e. the second method won't be able to update the original.

Thanks, Marc. I have tried that out already. No luck. I guess I will have to
consult the authors of that function.

I appreciate your help.

Thanks.
Sumit.

 

[Ignacio Machin ( .NET/ C# MVP )]

Greetings,

If I created a bitmap using:

Bitmap b = new Bitmap(50, 50);

And if I needed to get the handle associated with this bitmap (hWnd, I need
to do this because a function that I cannot touch requires it), how shouldI
go about doing this?

I would be extremely grateful if someone could help me out with this one.

Regards,
Sumit.

Hi,

I do not think that you can do that, IIRC from some old thread a
Bitmap is just a memory representation of the image, it's not a Bitmap
object like in the unmanaged world.

What you could do though is P/invoke the Win32 API to create a Bitmap
and then use the hWnd from that.

 

[Claes Bergefall]

Thanks, Marc. I have tried that out already. No luck. I guess I will have
to consult the authors of that function.

Not sure if this helps but...

Once you get the handle back you should be able to use Image.FromHBitmap to
create a new managed bitmap from it (including the changes made by the
external function).

/claes