why can't I use string???

hello,
well I have been struggling with something that makes absolutely no sense to me for the past hour now.

for some reason, my compiler (MSVC++ 6.0) will not let me use the C++ string class. I have included the string header, but am guessing it is missing alot of declarations or something.

Firstly, I tried using a C-style null terminated char array for a string. then I found MSVC++ does not have the strings.h. so now I try to use the C++ string class, and get "undeclared identifier" on the line that my identifier exists on :confused: . please take a look at this and try to point out something that I am doing wrong (I am guessing I'll have to write my own string class and include it in a new header to fix it :rolleyes: ):

Code:

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#include "stdafx.h"
#include "resource.h"
#include <stdio.h>
#include <windows.h>
#include <commdlg.h>
#include <string>

BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
        string szFileName1("");
        string szFileName2("");

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that would declare strings with the identifiers of "szFileName1" and "szFileName2"? correct???? I am using the ("") for safety and clarity purposes. so then I try this:

Code:

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#include "stdafx.h"
#include "resource.h"
#include <stdio.h>
#include <windows.h>
#include <commdlg.h>
#include <string>

BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
        char szFileName1[] = "";
        char szFileName2[] = "";
        string F1(szFileName1);
        string F2(szFileName2);

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and I still get the undeclared identifier error :mad: . I read up on the error and its description says its usually caused by a variable declaration with no type specified. but I don't see where there are ANY missing types (not unless they are in the included string.h like I said), the variables you see in first example should be of type string, and the second example should be null terminated char arrays (c-style strings) which then get defined as strings called F1 and F2. so can someone here please tell me what the heck I am doing wrong :confused: ????

thank you in advance

A quick glance through the C++ forum tells me that the string class is in the std namespace. So, you either declare the variables as std::string or put "using namespace std;" underneath your includes.

dot h aka .h is a c string header not cpp. You have to compile the file as a cpp file for it to work.

Code:

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char teststr1[] = { "abcdefghijklmnopqrstuvwxyz"  } ;

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works fine for c.

edit to add

You can not use cpp in c.

thanks kryptkat! that was my problem (didn't know .h made any difference for dev environment included headers :o ).

Quote:

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Firstly, I tried using a C-style null terminated char array for a string. then I found MSVC++ does not have the strings.h. so now I try to use the C++ string class, and get "undeclared identifier" on the line that my identifier

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Try:

Code:

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#include <cstring>

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But if you're using C++ then it might be best to get used to std::string's

Quote:

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then I found MSVC++ does not have the strings.h

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That's because the C header is <string.h>, not <strings.h>.

The standard C header files are available in C++. You just drop the .h and add a leading c. So <stdio.h> becomes <cstdio>.

Quote:

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A quick glance through the C++ forum tells me that the string class is in the std namespace. So, you either declare the variables as std::string or put "using namespace std;" underneath your includes.

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Or you can use

Code:

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using std::string;

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which is what I prefer.