## Presentation Device Driver Reference for OS/2

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### GreSaveXformData Parameter - ulSize

ulSize (ULONG) - input Size in bytes required for pBuffer.

Can be specified as 0. In this case, the function returns the size of the transform data:

    ulSize=GreSaveXformData (hdc, 0, 0);     /* Find out how large the buffer must be, */

    GreSaveXformData (hdc, ulSize, pBuffer); /* then save the transform state.         */