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| Loading a PNG from a DATAFILE |
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GrantG
Member #8,173
December 2006
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I'm trying to load a PNG image that I saved as "Other" data in the Allegro datafile to a OpenLayer Bitmap. I'm definately not doing it right since it's giving a runtime error in the Bitmap constructor. Here is how I'm trying to do it. DATAFILE *dataFile = load_datafile("test data.dat"); BITMAP *bitmap = load_memory_png(dataFile[0].dat, sizeof(dataFile[0].dat), 0); //loadpng library function Bitmap *newBitmap = Bitmap(bitmap, HAS_ALPHA_CHANNEL); I'm sure someone knows the right to do this. EDIT: Well I fixed it, didn't realize loadpng had functions to help with that.
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Kitty Cat
Member #2,815
October 2002
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FYI, the problem was the .dat pointer is only four bytes, so you're basically telling loadpng that the png data is only 4 bytes long. That fails and returns NULL, which means the Bitmap doesn't get made. For the size of the data, you want to use the .len field. -- |
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