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Asked: 2026-05-11T12:37:37+00:00

I currently try to implement some interprocess communication using the Windows CreateFileMapping mechanism. I

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I currently try to implement some interprocess communication using the Windows CreateFileMapping mechanism. I know that I need to create a file mapping object with CreateFileMapping first and then create a pointer to the actual data with MapViewOfFile. The example then puts data into the mapfile by using CopyMemory.

In my application I have an image buffer (1 MB large) which I want to send to another process. So now I inquire a pointer to the image and then copy the whole image buffer into the mapfile. But I wonder if this is really necessary. Isn’t it possible to just copy an actual pointer in the shared memory which points to the image buffer data? I tried a bit but didn’t succeed.

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  1. Different processes have different address spaces. If you pass a valid pointer in one process to another process, it will probably point to random data in the second process. So you will have to copy all the data.

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