How can I get bitmap in C# from unmanaged C++ lib function which return DIB win32 handler

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Hello Developers, i am going to get IMAGE in C# FROM a c++ DIB Win32 Handler.
Using manage wrapping techniques i wrap all other function and get all other value from unmanageable LIB File.. this time i wanna Wrap this Function

C++

HGLOBAL XRaySensorGetDIB(void);

and Return Bitmap or byte Array (Image) and get Output Bitmap or byte Array Image in my C# Project....

thanks in advance

What I have tried:

here is some code of my c++/CLI Managed Wrapping

C++

HBITMAP managedDllWrapper::ManageFunctionWrapper::SaveImageWrapper()
{
	  HGLOBAL m_hDib;
	 int retval = XRaySensorIsImageAvailable();

        if ( 0 < retval )
        {
            if (m_hDib ) ::GlobalFree(m_hDib);
            m_hDib = XRaySensorGetDIB();
		}
	
		HBITMAP bmi=new HBITMAP();
		bmi=&m_hDib;
		return bmi;  
}

Posted 23-May-16 21:06pm

Mouzam Basheer

Updated 23-May-16 22:14pm

KarstenK

v2

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2 solutions

Solution 2

I am sorry to tell you, that you are missing the needed knowledge about bitmaps. Here is a good starting point in the Microsoft documentation. Please take a deeper look at the different CreateBitmap and BitBlt function to understand the HBITMAP. It is a handle to a system object and needs a lot of care. ;-)

My idea and knowledge would go the other way by providing the data from C# and fill it in C++.

cook book

1. ask for the size
2. allocate in C# a bitmap and transfer the handle or the buffer
3. copy the bitmap into the bitmap handle or get the bits filled in C++

Tip: use the search box and look at different samples

Posted 23-May-16 21:32pm

KarstenK

Comments

Mouzam Basheer 24-May-16 4:25am

Thanks Karstenk..
i have lack knowledge about c++. please write some code for me.. to wrap this function
HGLOBAL XRaySensorGetDIB(void);

and get any return type that is return an image in my c# project..

KarstenK 26-May-16 5:27am

Sorry I wont, but a tip for the last step: if you have the bits, you can use https://msdn.microsoft.com/library/zy1a2d14(v=vs.110).aspx

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OriginalGriff · Accepted Answer · 2016-05-23T21:15:00

Solution 1

This might help: DIB to System.Bitmap[^]

Posted 23-May-16 21:15pm

OriginalGriff

Comments

George Jonsson 24-May-16 4:20am

Wouldn't this method do the job?
Image.FromHbitmap Method (IntPtr) (System.Drawing)[^]