Screen Event Recorder DLL/Application

///////////////////////////////////////////////////////////////////////////////
//	File:		Playfile.cpp
//	Version:	1.5
//  Implementation file dialog and PlayFile (RunDll32.exe) extension
//
//	Author:		Ernest Laurentin
//	E-mail:		elaurentin@netzero.net
//
//  Permission to use, copy, modify, distribute and sell this software
//  and its documentation for any purpose is hereby granted without fee,
//  provided that the above copyright notice appear in all copies and
//  that both that copyright notice and this permission notice appear
//  in supporting documentation.
//
//	This file is provided "as is" with no expressed or implied warranty.
//	The author accepts no liability for any damage/loss of business that
//	this software may cause.
//
//	Version history
//  Ver 1.0 - 04/24/2003 - Initial Release
//  Ver 1.5 - 05/04/2003 - Bug fixes, Add 'CPlayFileDlg' ATL-class
///////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "Resource.h"
#include <tchar.h>   // for _tcscpy, _tcsncmp, _tcslen
#include <stdio.h>	 // for sscanf
#include "PlayFileDlg.h"
#include "MacRcrdImport.h"

///////////////////////////////////////////////////////////////////////////////
// L O C A L S
int PlayFileInt(HWND hwnd, HINSTANCE hinst, LPCTSTR lpCmdLine, int nCmdShow);
void GetPlayfileArgs(LPCTSTR lpCmdLine, LPTSTR szFileBuffer, bool& bPlay);


///////////////////////////////////////////////////////////////////////////////
// PlayFileA
// DESCRIPTION
//  This function is called from 'rundll32'
//  rundll32 DllName,PlayFile [Arguments]
//
// PARAMETERS:
//	HWND hwnd		  :	handle to owner window
//	HINSTANCE hinst	  : instance handle (DLL instance)
//  LPSTR	lpCmdLine : command-line
//	int		nCmdShow  : show state
///////////////////////////////////////////////////////////////////////////////
#pragma comment(linker, "/EXPORT:PlayFileA@16=PlayFileA")
void CALLBACK PlayFileA(HWND hwnd, HINSTANCE hinst, LPCSTR lpCmdLine, int nCmdShow)
{
	TCHAR szCommandLine[MAX_PATH] = { 0 };

#ifdef _UNICODE
	MultiByteToWideChar(CP_ACP, 0, lpCmdLine, -1, szCommandLine, MAX_PATH);
#else
	_tcsncpy(szCommandLine, lpCmdLine, MAX_PATH);
#endif

	PlayFileInt( hwnd, hinst, szCommandLine, nCmdShow);
}


///////////////////////////////////////////////////////////////////////////////
// PlayFileW
// DESCRIPTION
//  This function is called from 'rundll32'
//  rundll32 DllName,PlayFile [Arguments]
//
// PARAMETERS:
//	HWND hwnd		  :	handle to owner window
//	HINSTANCE hinst	  : instance handle (DLL instance)
//  LPSTR	lpCmdLine : command-line
//	int		nCmdShow  : show state
///////////////////////////////////////////////////////////////////////////////
#pragma comment(linker, "/EXPORT:PlayFileW@16=PlayFileW")
void CALLBACK PlayFileW(HWND hwnd, HINSTANCE hinst, LPCWSTR lpCmdLine, int nCmdShow)
{
	TCHAR szCommandLine[MAX_PATH] = { 0 };

#ifndef _UNICODE
	WideCharToMultiByte(CP_ACP, 0, lpCmdLine, -1, szCommandLine, MAX_PATH, NULL, NULL);
#else
	_tcsncpy(szCommandLine, lpCmdLine, MAX_PATH);
#endif

	PlayFileInt( hwnd, hinst, szCommandLine, nCmdShow);
}


///////////////////////////////////////////////////////////////////////////////
// PlayFileInt
int PlayFileInt(HWND hwnd, HINSTANCE hinst, LPCTSTR lpCmdLine, int nCmdShow)
{
	// get command-line arguments
	TCHAR szFileName[MAX_PATH] = { 0 };
	bool bPlay = false;
	GetPlayfileArgs(lpCmdLine, (LPTSTR) szFileName, bPlay);

	TCHAR szClass[32] = { 0 };
	GetClassName(hwnd, szClass, 32);
	// must be run by 'RunDll32.exe'
	//if (_tcsicmp(szClass, _T("RunDLL")) != 0)
	//	return 0;

	// show dialog
	CPlayFileDlg dlg;
	dlg.SetFileName( szFileName );
	dlg.SetAutoPlay( bPlay );
	int nResult = dlg.DoModal(hwnd);
	return nResult;
}

///////////////////////////////////////////////////////////////////////////////
// GetPlayfileArgs
void GetPlayfileArgs(LPCTSTR lpCmdLine, LPTSTR szFileBuffer, bool& bPlay)
{
	LPCTSTR lpszCommand = lpCmdLine;
	int nToParse = _tcslen( lpszCommand );
	while( nToParse > 0 )
	{
		if (lpszCommand[0] == TCHAR('-') || lpszCommand[0]==TCHAR('/'))
		{
			int nSkip = 1;

			if (_tcsnicmp((lpszCommand+1), _T("FILE:"), 5) == 0)
			{
				_stscanf((lpszCommand+6), _T("%s"), szFileBuffer);
				nSkip = _tcslen( szFileBuffer ) + 6; // 6 = '/FILE:'
			}
			else if (_tcsnicmp((lpszCommand+1), _T("PLAY"), 4) == 0)
			{
				bPlay = true;
				nSkip = 5; // 5 = '/PLAY'
			}

			// Skip...till next argument
			if (nToParse > 0)
			{
				lpszCommand = lpszCommand + nSkip;
				nToParse -= nSkip;
				while( (nToParse>0) && (lpszCommand[0] != TCHAR('-')) && (lpszCommand[0] != TCHAR('/')))
				{
					lpszCommand++;
					nToParse--;
				}
			}
		}
		else
			nToParse = 0;
	}
}