Re: Push button in a dialog box for exploring path.

Giovanni Dicanio <>
Sun, 20 Sep 2009 10:23:54 +0200
Daum ha scritto:

I used the way below which are from internet and it works.

But I don't know if it is the best way.



A problem I see in the code you posted is that it is not Unicode-aware.
The problem is that std::string and 'char' buffers are used, instead the
code should use string and buffers based on TCHAR (which expands to
'char' in ANSI/MBCS builds, and to 'wchar_t' in Unicode builds).

So, your code will fail to compile in Unicode builds (which should be
the standard in these days).

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

bool GetFolder(std::string& folderpath,
               const char* szCaption = NULL,
               HWND hOwner = NULL)

The prototype of the function may be corrected to something like this
(using CString instead of 'std::string', and TCHR instead of 'char'):

   bool GetFolder( CString & folderpath,
                 const TCHAR * szCaption = NULL,
                 HWND hOwner = NULL)

 > [...]

   if(pIDL != NULL)
      // Create a buffer to store the path, then
      // get the path.
      char buffer[_MAX_PATH] = {'\0'};

A TCHAR should be used above:

   TCHAR buffer[...

// CDialogCreateVolume message handlers
void CDialogCreateVolume::OnCreatVolumePath()

     CString folderPath;
    std::string szPath("");

Just use CString above (no need for std::string):

   CString folderPath;

     if (GetFolder(szPath, "Select a folder.") == true)

Use _T() for string literal decorations (or just store strings in string

   if ( GetFolder(folderPath, _T("Select a folder.") )


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