<mphillip...@nospam.jun0.c0m> wrote:

> There are many ways to Marshal a gdiplus bitmap between managed and
> unmanaged code.
>
> Here are a few methods:
> 1) You may use GetHBITMAP() to pass a handle to a bitmap.
> 2) You may use a stream to represent the bitmap.
> 3) You may use a global memory pointer to a packed DIB(i.e.,
> BITMAPINFOHEADER, ColorTable, bits).
> 4) You may use a IPictureDisp interface.
>
> Choice #1 is the easiest to implement.

>I have a very simple (I think) question: How do I convert a unmanaged
> GDI+ bitmap into a managed GDI+ Image? The code is C++ CLI (.Net
> 2.0). There is another option, the Bitmap is being generated by
> calling it's function UnlockBits() that takes a unmanaged
> Gdiplus::BitmapData structure. Is it easier/safer to convert the
> unmanaged Gdiplus::BitmapData structure and pass that into a managed
> Bitmap object's UnlockBits() method?

> I major concern is not ease, but speed. The unmanaged code is
> manipulating the data in the unmanaged BitmapData.Scan0 to generate
> the image for display. When using the LockBits() call, the
> ImageLockModeUserInputBuf flag is being set. Is it possible to simply
> cast the unmanaged BitmapData to a managed BitmapData?

"Cartoper" <cartoper@gmail.com> wrote in message
news:1189527579.653624.255620@d55g2000hsg.googlegroups.com...
> On Sep 11, 12:06 pm, "Michael Phillips, Jr."
> <mphillip...@nospam.jun0.c0m> wrote:
>
>> There are many ways to Marshal a gdiplus bitmap between managed and
>> unmanaged code.
>>
>> Here are a few methods:
>> 1) You may use GetHBITMAP() to pass a handle to a bitmap.
>> 2) You may use a stream to represent the bitmap.
>> 3) You may use a global memory pointer to a packed DIB(i.e.,
>> BITMAPINFOHEADER, ColorTable, bits).
>> 4) You may use a IPictureDisp interface.
>>
>> Choice #1 is the easiest to implement.
>
> I major concern is not ease, but speed. The unmanaged code is
> manipulating the data in the unmanaged BitmapData.Scan0 to generate
> the image for display. When using the LockBits() call, the
> ImageLockModeUserInputBuf flag is being set. Is it possible to simply
> cast the unmanaged BitmapData to a managed BitmapData?
>