VC 打开目录 打开上次打开目录

//DirBrowser.h

#pragma once

class CDirBrowser
{
public:
    CDirBrowser    ( bool fRecent = false, const TCHAR* pszTitle = TEXT( "选择目录" ) );
    ~CDirBrowser( void );

    TCHAR*    Show( void );
private:

    BOOL            m_fRecent;
    BROWSEINFO        m_bi;
    LPITEMIDLIST    m_pidl;
    LPMALLOC        m_pMalloc;

    static INT CALLBACK BrowseCallbackProc(HWND hwnd, 
                                UINT uMsg,
                                LPARAM lp, 
                                LPARAM pData);
};

// DirBrowser.cpp


#include "StdAfx.h"

#include <shlobj.h>
#include "DirBrowser.h"

TCHAR s_szRecent[ MAX_PATH ] = { 0 };


CDirBrowser::
CDirBrowser( 
            bool fRecent /* = false */, 
            const TCHAR* pszTitle /* = 选择目录 */
            )
{
    m_fRecent = fRecent;
    memset( ( void* )&m_bi,    0, sizeof( BROWSEINFO ) );
    m_pidl = NULL;
    m_pMalloc = NULL;

    m_bi.hwndOwner = NULL;
    m_bi.pszDisplayName = 0;
    m_bi.lpszTitle = pszTitle;
    m_bi.pidlRoot = 0;
    m_bi.ulFlags = BIF_RETURNONLYFSDIRS | BIF_STATUSTEXT;
    m_bi.lpfn = fRecent ? BrowseCallbackProc : NULL;
}



CDirBrowser::
~CDirBrowser(
             void
             )
{
    if ( m_pMalloc != NULL ) {
        if ( m_pidl != NULL ) {
            m_pMalloc->Free( m_pidl );
        }
        m_pMalloc->Release( );
    }
}




INT
CALLBACK
CDirBrowser::
BrowseCallbackProc(HWND hwnd, 
                   UINT uMsg,
                   LPARAM lp, 
                   LPARAM pData
                   )
{
    if (uMsg == BFFM_INITIALIZED) 
    {
        // WParam is TRUE since you are passing a path.
        // It would be FALSE if you were passing a pidl.
        SendMessage( hwnd, BFFM_SETSELECTION, TRUE, (LPARAM)s_szRecent );
    }
    return 0;
}


TCHAR*
CDirBrowser::
Show(
     void
     )
{
    if ( SUCCEEDED( SHGetMalloc( &m_pMalloc ) ) )
    {
        m_pidl = SHBrowseForFolder( &m_bi ); 
        if ( m_pidl == NULL ) {
            return NULL;
        }

        TCHAR m_szPath[ MAX_PATH ] = { 0 };
        SHGetPathFromIDList( m_pidl, m_szPath );
        lstrcpy( s_szRecent, m_szPath );
    }

    return s_szRecent;
}