Hi - You could try something like: import Foreign.Ptr import Foreign.C.String bmp <- withCAString "C:\1.bmp" $ bitmap (Size (100,100)) (Vertex2 0 0) (Vertex2 0 0) and if that doesn't work try withCString or withCWString. I'm assuming that the Ptr a in the docs is supposed to be a pointer to a null terminated C string hence withCAString should hopefully work. I'd also compile with -fffi (if you're using ghc) (I haven't tried it myself so someone else might have a better answer) Regards, Brian. ----- Original Message ----- From: enache alex To: haskell-cafe@haskell.org Sent: Saturday, April 22, 2006 11:10 PM Subject: [Haskell-cafe] need help please [HOpenGL] hello ; I am writing to ask you a thing ; I am writing a little game on Haskell's HOpenGL ; the game isn't much , but I want to make look a little better ; and for that I want to use bitmaps (or textures) ; I don't know very much about this subject ; I've tried to use de bitmap function from Graphics.Rendering.OpenGL.GL.Bitmap , but i gives me an error ; I've used the function like this ; bmp <- bitmap (Size (100,100)) (Vertex2 0 0 ) (Vector2 0 0 ) (Ptr "C:\1.bmp") end it tells me that he doesn't find the Ptr constructor ; if you can supply an full example on this matter it would great ; many thanks ; hope to hear from you soon ; thanks for your time in reading my letter ; PS : the example doesn't have to be big , it just has to contain all the things , in order for me not to miss something _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe