c++ - IOCTL Driver SystemBuffer always NULL -


i have simple struct pass driver. here struct:

typedef struct readstruct {   ... } readstruct, *prreadstruct;

here usermode application:

dword dwreturn; readstruct reader{ ... };  writefile(hdriver, (lpcvoid)&reader, sizeof(readstruct), &dwreturn, null);

here driver code, returns null readstruct. doing wrong?

pio_stack_location piostackirp = null; prreadstruct readstruct;  piostackirp = iogetcurrentirpstacklocation(irp);  dbgprintex(0, 0, "writebufferedio\n");  if (piostackirp) {     readstruct = (prreadstruct)irp->associatedirp.systembuffer;     if (readstruct)     {         // place never         if (readstruct->readsize)         {             readmemoutputclient(readstruct);         }     } }

do_buffered_io flag should set in driverentry in deviceobject->flags.

thanks user @rbmm pointing out.


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