help with image dll interfacing vb

This is a discussion on help with image dll interfacing vb within the Windows Programming forums, part of the Platform Specific Boards category; Hi all. I want to know how to pass a bitmap from vb into a vc++ dll, so that I ...

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    help with image dll interfacing vb

    Hi all.

    I want to know how to pass a bitmap from vb into a vc++ dll, so that I can do some transformations on it, and then have the dll pass the new bitmap back to vb.

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    mustang benny bennyandthejets's Avatar
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    Probably better to ask this question in a VB forum too.
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    Thanks for the reply, but I just came from a vb forum and they suggested I try here.

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    mustang benny bennyandthejets's Avatar
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    arf arf no-one wants to solve your problems!

    I can't really help you with this, because I've forgotten what VB I ever knew. Sorry.
    benforbes@optusnet.com.au
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    C++ Developer XSquared's Avatar
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    Pass the hDC to the VC++ DLL, and then you can manipulate it using the GDI functions.
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    excuss my lacking knowledge, but what is hdc

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    mustang benny bennyandthejets's Avatar
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    HDC is a handle to a device context. A device context contains information about how things will be drawn to the screen. I suggest you google "device context" and go to the MSDN reference.

    Basically, you'll use a WinAPI function to load your DLL. You'll then obtain the HDC for the bitmap, and pass it to the DLL.
    benforbes@optusnet.com.au
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    Thanks. I do that search and get back to you.

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