i am getting this error ''CoInitializeEx'' undeclared identifier when i try to use CoInitialiseEx. I got this from the bgmusic sample in the directshow samples in the dx90sdk. It works in their program, but not mine, i copied all their headers and links, and still it cant find it, i include the ole3d.dll and objbase.h, and still it doesnt work. What on earth could be the reason my program can''t find it, and the bgmusic sample can?? Thanks,

make sure you include the #define _WIN32_DCOM preprocessor directive at the beginning of your code

thx works now