Windows Driver Model >> Pascal
StartIO
參考資訊:
1. Source Code
2. delphidriverdevelopmentkit
StartIO提供一個序列化的機制,讓使用者可以依照順序處理IRP,這個機制對於某些只能序列執行的硬體相當有幫助,省去用軟體實現序列化的程式碼,使用的步驟:
1. IoMarkIrpPending()
2. IoStartNextPacket()
main.pas
unit main; interface uses DDDK; const DEV_NAME = '\Device\MyDriver'; SYM_NAME = '\DosDevices\MyDriver'; function _DriverEntry(pOurDriver:PDRIVER_OBJECT; pOurRegistry:PUNICODE_STRING):NTSTATUS; stdcall; implementation var pNextDevice: PDEVICE_OBJECT; szBuf: array[0..255] of char; procedure Unload(pOurDriver:PDRIVER_OBJECT); stdcall; begin end; function StartIo(pOurDevice:PDeviceObject; pIrp:PIrp):NTSTATUS; stdcall; var len: ULONG; psk: PIO_STACK_LOCATION; begin len:= 0; psk:= IoGetCurrentIrpStackLocation(pIrp); if psk^.MajorFunction = IRP_MJ_WRITE then begin DbgPrint('StartIo, IRP_MJ_WRITE', []); len:= psk.Parameters.Write.Length; memcpy(@szBuf[0], pIrp^.AssociatedIrp.SystemBuffer, len); DbgPrint('Buffer: %s, Length: %d', [szBuf, len]); end else if psk^.MajorFunction = IRP_MJ_READ then begin DbgPrint('StartIo, IRP_MJ_READ', []); len:= strlen(@szBuf[0])+1; memcpy(pIrp^.AssociatedIrp.SystemBuffer, @szBuf[0], len); end; Result:= STATUS_SUCCESS; pIrp^.IoStatus.Information:= len; pIrp^.IoStatus.Status:= Result; IoCompleteRequest(pIrp, IO_NO_INCREMENT); IoStartNextPacket(pOurDevice, FALSE); end; function IrpFile(pOurDevice:PDEVICE_OBJECT; pIrp:PIRP):NTSTATUS; stdcall; var psk: PIO_STACK_LOCATION; begin psk:= IoGetCurrentIrpStackLocation(pIrp); case psk^.MajorFunction of IRP_MJ_CREATE: DbgPrint('IRP_MJ_CREATE', []); IRP_MJ_READ: begin DbgPrint('IrpFile, IRP_MJ_READ', []); IoMarkIrpPending(pIrp); IoStartPacket(pOurDevice, pIrp, Nil, Nil); Result:= STATUS_PENDING; exit; end; IRP_MJ_WRITE: begin DbgPrint('IrpFile, IRP_MJ_WRITE', []); IoMarkIrpPending(pIrp); IoStartPacket(pOurDevice, pIrp, Nil, Nil); Result:= STATUS_PENDING; exit; end; IRP_MJ_CLOSE: DbgPrint('IRP_MJ_CLOSE', []); end; Result:= STATUS_SUCCESS; pIrp^.IoStatus.Status:= Result; pIrp^.IoStatus.Information:= 0; IoCompleteRequest(pIrp, IO_NO_INCREMENT); end; function IrpPnp(pOurDevice:PDEVICE_OBJECT; pIrp:PIRP):NTSTATUS; stdcall; var psk: PIO_STACK_LOCATION; suSymName: UNICODE_STRING; begin psk:= IoGetCurrentIrpStackLocation(pIrp); if psk^.MinorFunction = IRP_MN_REMOVE_DEVICE then begin RtlInitUnicodeString(@suSymName, SYM_NAME); IoDetachDevice(pNextDevice); IoDeleteDevice(pOurDevice); IoDeleteSymbolicLink(@suSymName); end; IoSkipCurrentIrpStackLocation(pIrp); Result:= IoCallDriver(pNextDevice, pIrp); end; function AddDevice(pOurDriver:PDRIVER_OBJECT; pPhyDevice:PDEVICE_OBJECT):NTSTATUS; stdcall; var suDevName: UNICODE_STRING; suSymName: UNICODE_STRING; pOurDevice: PDEVICE_OBJECT; begin RtlInitUnicodeString(@suDevName, DEV_NAME); RtlInitUnicodeString(@suSymName, SYM_NAME); IoCreateDevice(pOurDriver, 0, @suDevName, FILE_DEVICE_UNKNOWN, 0, FALSE, pOurDevice); pNextDevice:= IoAttachDeviceToDeviceStack(pOurDevice, pPhyDevice); pOurDevice^.Flags:= pOurDevice^.Flags or DO_BUFFERED_IO; pOurDevice^.Flags:= pOurDevice^.Flags and not DO_DEVICE_INITIALIZING; Result:= IoCreateSymbolicLink(@suSymName, @suDevName); end; function _DriverEntry(pOurDriver:PDRIVER_OBJECT; pOurRegistry:PUNICODE_STRING):NTSTATUS; stdcall; begin pOurDriver^.MajorFunction[IRP_MJ_PNP]:= @IrpPnp; pOurDriver^.MajorFunction[IRP_MJ_CREATE]:= @IrpFile; pOurDriver^.MajorFunction[IRP_MJ_READ]:= @IrpFile; pOurDriver^.MajorFunction[IRP_MJ_WRITE]:= @IrpFile; pOurDriver^.MajorFunction[IRP_MJ_CLOSE]:= @IrpFile; pOurDriver^.DriverStartIo := @StartIo; pOurDriver^.DriverExtension^.AddDevice:=@AddDevice; pOurDriver^.DriverUnload:=@Unload; Result:=STATUS_SUCCESS; end; end.
IrpFile()IRP_MJ_READ和IRP_MJ_WRITE使用StartIO方式處理
app.pas
program main; {$APPTYPE CONSOLE} uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, DIALOGS; var fd: DWORD; ret: DWORD; len: DWORD; szBuf: array[0..255] of char; begin fd:= CreateFile('\\.\MyDriver', GENERIC_READ or GENERIC_WRITE, FILE_SHARE_READ, Nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); if (fd <> INVALID_HANDLE_VALUE) then begin StrCopy(szBuf, 'I am error'); len:= strlen(szBuf)+1; WriteLn(Output, Format('WR: %s', [szBuf])); WriteLn(Output, Format('Length: %d', [len])); WriteFile(fd, szBuf, len, ret, Nil); ReadFile(fd, szBuf, len, ret, Nil); WriteLn(Output, Format('RD: %s', [szBuf])); WriteLn(Output, Format('Length: %d', [ret])); CloseHandle(fd); end else begin WriteLn(Output, 'failed to open mydriver'); end; end.
結果