Communication between Windows drivers and Applications

Driver layer:

Pio_stack_location stack = iogetcurrentirpstacklocation (pirp );

// Obtain the input buffer size
Ulong cbin = stack-> parameters. deviceiocontrol. inputbufferlength;

// Obtain the size of the output buffer.
Ulong cbout = stack-> parameters. deviceiocontrol. outputbufferlength;
// Obtain the ioctl code
Ulong code = stack-> parameters. deviceiocontrol. iocontrolcode;

 

 

Ctl_code (Devicetype,Function,Method,Access) // Ntddk. h
Method:

Method_buffered // buffer Mode

Method_in_direct or method_out_direct // direct ing address

Method_neither

 

 

If it is method_in_direct or method_out_direct, the input and buffer modes are the same, but the output is no longer the input address,

UseMmgetsystemaddressformdlsafe in pmdlMDL,

/* IRP-> mdladdress */In mm_page_priorityPriorityNormalpagepriority); ing

 

 

IfMethod_neither:

Input address int * inputbuffer = (int *) Stack-> parameters. deviceiocontrol. type3inputbuffer;

Output address: IRQ-> userbuffer

Before the operation, you must determine: probeforreadAndThe two functions probeforwrite determine whether they can be read and written.

Last

// Process the corresponding IPR
Pirp-> iostatus. Information = Info; // you can specify 0 bytes for the returned operation.
Pirp-> iostatus. Status = STATUS_SUCCESS; // return success
Iocompleterequest (pirp, io_no_increment); // indicates that the IRP is completed.

 

 

 

 

 

User Layer

1: createfile

2: bool winapi deviceiocontrol (
_ In handleHdevice,
_ In DWORDDwiocontrolcode,
_ In lpvoidLpinbuffer,
_ In DWORDNinbuffersize,
_ Out lpvoidLpoutbuffer,
_ In DWORDNoutbuffersize,
_ Out lpdwordLpbytesreturned,
_ In lpoverlappedLpoverlapped
);

 

 

 

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