Converting tchar array to string array

This is a discussion on Converting tchar array to string array within the C++ Programming forums, part of the General Programming Boards category; I have a program which needs to take the logical drives returned from the GetLogicalDriveString function and store them in ...

  1. #1
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    Exclamation Converting tchar array to string array

    I have a program which needs to take the logical drives returned from the GetLogicalDriveString function and store them in a string array for later use in a filepath. I tried doing this directly and it failed. Here's my code:
    Code:
    #include "stdafx.h"
    #include <iostream>
    #include <io.h>
    #include <time.h>
    #include <string>
    #include <windows.h>
    #include <direct.h>
    #include <stdio.h>
    #include <tchar.h>
    #include <Lmcons.h>
    #include <sstream>
    
    using namespace std;
    
    int _tmain(int argc, _TCHAR* argv[])
    {
    CHAR name [ UNLEN + 1 ];
      DWORD size = UNLEN + 1;
    
      if (GetUserName( (CHAR*)name, &size ))
        wcout << L"Hello, " << name << L"!\n";
      else
        cout << "Hello, unnamed person!\n";
    
    	TCHAR szBuffer[1024];
    ::GetLogicalDriveStrings(1024, szBuffer);
    TCHAR *pch = szBuffer;
    while (*pch) {
    _tprintf(TEXT("%s\n"), pch);
    pch = &pch[_tcslen(pch) + 1];
    }
       int arraylength = sizeof( pch );
       cout << arraylength << endl;
       string drive[1025];
    
    int i;
    i = 0;
    
    if (i < arraylength)
    {
    	i++;
    	drive[i] = pch[i];
    	cout << drive[i] << endl;
    }
    	return 0;
    }

  2. #2
    Just a pushpin. bernt's Avatar
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    int arraylength = sizeof( pch );
    sizeof returns the size of a data type. Here, pch is a pointer, so it returns the size of a pointer (4 bytes on a 32-bit machine). Judging by the name of the variable this is not what you wanted.

    string drive[1025];
    This is declaring an array of 1025 strings. I think perhaps what you were going for was a string with 1025 characters reserved? C++ string memory is automatically handled so there's no need for it, just declare one string, though if it makes you feel better you can use drive.reserve(1025);
    Consider this post signed

  3. #3
    and the hat of wrongness Salem's Avatar
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    More cross-posting

    Didn't learn from your previous thread huh?

    Here, try this on for size
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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