Encapsulating MFC's CFileFind Class
By Graham Pearson, May 01, 2002
CFileFind does a good job of encapsulating the Windows API functions FindFirstFile and FindNextFile and the WIN32_FIND_DATA structure. But making recursive calls to a function containing CfileFind can be cumbersome. Graham created a class called CfileFindDriver, which acts like a "for loop that avoids recursive function calls.
May 2002/Encapsulating MFC’s CFileFind Class
Listing 1: FileFindDriver.h
Interface for the CFileFindDriver class
// Code written by Graham Pearson, who can be reached at [email protected]
// FileFindDriver.h: interface for the CFileFindDriver class
//
//////////////////////////////////////////////////////////////////////
#if !defined(FILEFINDDRIVER_H)
#define FILEFINDDRIVER_H
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
//////////////////////////////////////////////////////////////////////
// We need a "forward" reference to this private class
class CSearchObject;
class CFileFindDriver
{
// Constructor arguments
const CString m_sSearchDir;
CStringArray m_sFileSpecArray;
const BOOL m_bRecurse;
// Dynamic list of objects derived from CSearchObject
CTypedPtrList<CPtrList, CSearchObject*> m_searchList;
// Pointer to current CFileFind object in the above list
const CFileFind* m_pFileFind;
// List of all directories recursed into since construction
// or since the most-recent call to First()
CStringList m_sSearchDirList;
// Number of files found during this search that match
// at least one of the entries in m_sFileSpecArray
int m_iFilesFound;
// Member variables used to make sure we don't return
// a specific file more than once during our search
CStringList m_foundList;
int m_iSpecArrayPos;
public:
CFileFindDriver(const CString& sSearchDir, const CString& sSearchSpec, BOOL bRecurse);
CFileFindDriver(const CString& sSearchDir, const CStringArray& sFileSpecArray, BOOL bRecurse);
~CFileFindDriver();
// Get current CFileFind object
const CFileFind* GetFileFind() const { return m_pFileFind; }
// Navigate through files
BOOL First();
BOOL Next();
// Next, ++ style
const CFileFindDriver& operator++(int) { Next(); return *this; }
// Return a list of all directories searched since
// construction or since the most-recent call to First()
void GetSearchDirList(CStringList& sSearchDirList) const;
// Return number of files found since construction or since
// the most-recent call to First() that match the search criteria
int GetFilesFound() const { return m_iFilesFound; }
private:
void EmptySearchList();
};
//////////////////////////////////////////////////////////////////////
#endif // !defined(FILEFINDDRIVER_H)
