Image.FromHbitmap exception: A generic error occurred in GDI+

manjunath 1

I am trying to create bitmap from dib handle in order to show it in picturebox . But i keep getting this error and not sure how to fix this problem. I did search for error in online and most resources points out that the inptr is zero so error pops up. but thats not my case.

Can anyone explain me how to fix this.

Timon Yang-MSFT 9,591 Reputation points

2020-12-16T09:26:25.9+00:00

@manjunath
Image.FromHbitmap requires the handle of the Windows bitmap object. If you pass other irrelevant handles, such as the handle of a Windows window, to it, it will also have this exception.
So can you show the code of the TransferPictures() method, I suspect that this method may have acquired an inappropriate handle.
manjunath 1 Reputation point

2020-12-16T09:33:27.587+00:00

rc = DSixfer( appid, srcds, TwDG.Image, TwDAT.ImageNativeXfer, TwMSG.Get, ref hbitmap );

The transfer function gives back native image format handle. In this case scanner populates a device independednt image format and gives back handle.

There is this code in regards to it.
https://www.codeproject.com/Articles/16268/DIB-to-System-Bitmap.

Isnt there any other function built into some namespace by .net instead of above custom function. I basically want to use this dib handle get the data from memory and show it in picture box. P.s my next step is using that image convert to bytes format and send it to browser as form of api.
Timon Yang-MSFT 9,591 Reputation points

2020-12-17T06:01:42.067+00:00

@manjunath
I searched but didn't find such a function, so maybe it is.

1 answer

Cheong00 3,476 Reputation points

2020-12-12T01:26:14.863+00:00

I think that you can't draw Device Independent Bitmap directly with GDI+ as it doesn't use the bitmap header of the bitmap. You need to create your own DIBSection and apply to it first (Ignore (3) because you're not drawing towards the DIBSection with GDI+).

You can refer to how to do it here (It's in C++ code but not too difficult to relate it to C#, as except the GetDC() call will be Graphics.GetHdc() and ReleaseDC() will be Graphics.ReleaseHdc(), the other things will be calling P/Invoke to corresponding GDI APIs.

Remember to call DeleteObject() to free the DIBSection afterwards.
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