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244 lines
5.0 KiB
244 lines
5.0 KiB
/**********************************************************************/
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/** Microsoft Windows **/
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/** Copyright(c) Microsoft Corp., 1993 **/
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/**********************************************************************/
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/*
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vxd32.c
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This module contains the Win32-dependent VxD interface.
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The following functions are exported by this module:
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OsOpenVxdHandle
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OsCloseVxdHandle
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OsSubmitVxdRequest
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FILE HISTORY:
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KeithMo 16-Jan-1994 Created.
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*/
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#include "stdafx.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//
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// Private constants.
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//
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#define DLL_ASSERT ASSERT
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//
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// Private types.
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//
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//
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// Private globals.
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//
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#ifdef DEBUG
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DWORD LastVxdOpcode;
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LPVOID LastVxdParam;
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DWORD LastVxdParamLength;
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#endif // DEBUG
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//
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// Private prototypes.
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//
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//
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// Public functions.
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//
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/*******************************************************************
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NAME: OsOpenVxdHandle
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SYNOPSIS: Opens a handle to the specified VxD.
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ENTRY: VxdName - The ASCII name of the target VxD.
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VxdId - The unique ID of the target VxD.
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RETURNS: DWORD - A handle to the target VxD if successful,
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0 if not.
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HISTORY:
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KeithMo 16-Jan-1994 Created.
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DavidKa 18-Apr-1994 Dynamic load.
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********************************************************************/
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DWORD
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OsOpenVxdHandle(
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CHAR* VxdName,
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WORD VxdId
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)
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{
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HANDLE VxdHandle;
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CHAR VxdPath[MAX_PATH];
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//
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// Sanity check.
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//
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DLL_ASSERT( VxdName != NULL );
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DLL_ASSERT( VxdId != 0 );
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//
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// Build the VxD path.
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//
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strcpy( VxdPath, "\\\\.\\");
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strcat( VxdPath, VxdName);
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//
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// Open the device.
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//
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// First try the name without the .VXD extension. This will
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// cause CreateFile to connect with the VxD if it is already
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// loaded (CreateFile will not load the VxD in this case).
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//
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VxdHandle = CreateFileA( VxdPath,
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_DELETE_ON_CLOSE,
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NULL );
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if( VxdHandle == INVALID_HANDLE_VALUE )
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{
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//
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// Not found. Append the .VXD extension and try again.
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// This will cause CreateFile to load the VxD.
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//
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strcat( VxdPath, ".VXD" );
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VxdHandle = CreateFileA( VxdPath,
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_DELETE_ON_CLOSE,
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NULL );
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}
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if( VxdHandle != INVALID_HANDLE_VALUE )
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{
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return (DWORD)VxdHandle;
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}
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return 0;
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} // OsOpenVxdHandle
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/*******************************************************************
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NAME: OsCloseVxdHandle
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SYNOPSIS: Closes an open VxD handle.
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ENTRY: VxdHandle - The open VxD handle to close.
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HISTORY:
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KeithMo 16-Jan-1994 Created.
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********************************************************************/
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VOID
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OsCloseVxdHandle(
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DWORD VxdHandle
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)
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{
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//
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// Sanity check.
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//
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DLL_ASSERT( VxdHandle != 0 );
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CloseHandle( (HANDLE)VxdHandle );
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} // OsCloseVxdHandle
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/*******************************************************************
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NAME: OsSubmitVxdRequest
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SYNOPSIS: Submits a request to the specified VxD.
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ENTRY: VxdHandle - An open VxD handle.
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OpCode - Specifies the operation to perform.
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Param - Points to operation-specific parameters.
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ParamLength - The size (in BYTEs) of *Param.
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RETURNS: INT - Result code. 0 if successful, !0 if not.
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HISTORY:
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KeithMo 16-Jan-1994 Created.
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********************************************************************/
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INT
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OsSubmitVxdRequest(
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DWORD VxdHandle,
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INT OpCode,
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LPVOID Param,
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INT ParamLength
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)
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{
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DWORD BytesRead;
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INT Result = 0;
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//
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// Sanity check.
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//
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DLL_ASSERT( VxdHandle != 0 );
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DLL_ASSERT( ( Param != NULL ) || ( ParamLength == 0 ) );
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#ifdef DEBUG
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LastVxdOpcode = (DWORD)OpCode;
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LastVxdParam = Param;
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LastVxdParamLength = (DWORD)ParamLength;
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#endif // DEBUG
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//
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// Just do it.
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//
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if( !DeviceIoControl( (HANDLE)VxdHandle,
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OpCode,
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Param,
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ParamLength,
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Param,
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ParamLength,
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&BytesRead,
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NULL ) )
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{
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Result = GetLastError();
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}
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return Result;
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} // OsSubmitVxdRequest
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#ifdef __cplusplus
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}
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#endif
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