DosDevIOCtl Parameter - pcbDataLen

pcbDataLen (PULONG) - in/out

Pointer to the length of data.

Input

Pointer to the length, in bytes, of the data passed by the application in pData.
Output
Pointer to the length, in bytes, of the data returned.

If this function returns ERROR_BUFFER_OVERFLOW, then pcbDataLen points to the size of the buffer required to hold the data returned.

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