Command Line Parsing in MFC - VC++

Processing command line in MFC application.

While working with DocuMight our client need some additional features like automatic showing files, some type of permissions etc . After discussion with our project team we concluded to have a command line parameter. Frankly I don’t have much experience in command line processing. I only worked with C style command line arguments. [ int main(int argc, char *argv[])] Following are my sample test code wrote in InitInstance()of CWinApp.

TCHAR *pCommandLine = ::GetCommandLine();//here we will get all command line                                           //parameter including exe name. int nArgc = 0; LPWSTR *pArgv = ::CommandLineToArgvW( pCommandLine,  &nArgc); for( int nCmdCount=0; nCmdCount < nArgc; ++nCmdCount) {       TRACE2("%d: %s\n",nCmdCount, pArgv[nCmdCount]);  }

The above work only in Unicode character set, and also have so many problems. So I searched for a optimum solution and finally found the following solution.

Step1: Derive a class from CCommandLineInfo and override ParseParam Step2: pass customized CCommandLineInfo  to ParseCommandLine method.

#pragma once class CMyCommandLineInfo : public CCommandLineInfo { public:       virtual void ParseParam(  const TCHAR* pszParam, BOOL bFlag, BOOL bLast);       CString m_strMergeFileName;       bool m_bHideToolBar; };

#include "StdAfx.h" #include "MyCommandLineInfo.h" void CMyCommandLineInfo::ParseParam(  const TCHAR* pszParam, BOOL bFlag, BOOL bLast) {       if( TRUE == bFlag)//indicates that command start with /,-       {             CString strCommand = pszParam;             strCommand.MakeUpper();             if( strCommand.Compare( _T("H")) == 0)             {                   this->m_bHideToolBar = true;             }       }       else       {             m_strMergeFileName = pszParam;                                          } }

BOOL CtestCmdApp::InitInstance() {       //previous code  ...       CWinApp::InitInstance();       CMyCommandLineInfo commandLineInfo;       __super::ParseCommandLine(commandLineInfo);       if( true == commandLineInfo.m_bHideToolBar )       {             //code to hide toolbar.       }       if( TRUE == :: PathFileExists( commandLineInfo.m_strMergeFileName ))       {             //code to merge file.       }       //previous code  ... }

If you want to manipulate more specific commands I recommend following code.

for (int nArgc = 1; nArgc < __argc; ++nArgc) {       LPCTSTR pszParam = __targv[nArgc];       if (pszParam[0] == '-' || pszParam[0] == '/')       {             //do falg specific code.       } }