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Hei, I am using Microsft Visual studio 2010 for the dll. I have created an image in labview which is then sent to the dll in order to extract the rgb values. I was hoping to get the arrays of red, blue and green with the data representation from 0-255 (U8). But instead, I got a weird problem on the linker. Sometimes it compiles okey, sometimes not. I was wondering that I'm doing something wrong with the image variables (color:purple), because you can handle it like array of pixels or like handles which are in the end structures. So, which method should I use? Till now I used it like array of pixels. Also this I do not understand. Each pixel of the bitmap is big 32 bits or 4bytes: 1 byte for green, 1 for red, 1 for blue and what is porpuse for the other byte? Becuase in my dll I saved every byte in a different variable, in total 4 variables, and then send ti back to labwiew. When the dll functioned, I got only value form zero to one. Thanks for the help and any comments are appreciated