How To create char with dynamic size? How to remove last symbol of string?

[rain]

How To create char with dynamic size?

token is random lenght string that holds file path. FindFileData.cFileName is also random lenght string that holds filename.

I nee to create variable str with dynamic name because I want to append file name to it's path, but since I never know string lenght of path or filename I need to create variable str with dynamic size.

I tried:
char str[strlen(token) + strlen(FindFileData.cFileName)];

Error:
1>d:\development\cplusplus\del\del2\del2\del2.cpp(65) : error C2466: cannot allocate an array of constant size 0

And how to remove last char from string? token has * at the end. I need to remove that symbol before I join 2 strings together.

I tried this:

char *temp;
 strncpy (temp,token,strlen(token)-1);

But it didn't work.

Here's my full code if anyone wants to see it.

// del2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <string>
#include <iostream>
#include "Shlwapi.h"


using namespace std;


int main()
{
   WIN32_FIND_DATA FindFileData;
   HANDLE hFind;

   //Read list file
   FILE *filein;
   long lSize;
   char * buffer;
   size_t result;
   //Get path to list.txt
   	 char szFileName[MAX_PATH];
     HINSTANCE hInstance = GetModuleHandle(NULL);
     GetModuleFileName(hInstance, szFileName, MAX_PATH);
	 PathRemoveFileSpec(szFileName);
	 PathAppend(szFileName,"\\list.txt");
	 //Open file
   filein = fopen(szFileName, "r");
   //if (filein==NULL) {fputs ("File error",stderr); exit (1);}

    // obtain file size:
    fseek (filein , 0 , SEEK_END);
    lSize = ftell (filein);
    rewind (filein);

    // allocate memory to contain the whole file:
    buffer = (char*) malloc ((sizeof(char)*lSize)+1);

	// copy the file into the buffer:
    result = fread (buffer,1,lSize,filein);
	buffer[result] = '\0'; // make extra byte nul
	/*//Print some info
    printf ("%s\n",buffer);// list.txt
	printf ("%s\n",szFileName);//Path
    fclose(filein);
	*/

	//token
	char *token;
	token = strtok(buffer,"\r\n");
	   while( token != NULL )
       {
           // While there are tokens in "string"
           printf( "%s\n", token );

		   //char *temp;
		   //strncpy (temp,token,strlen(token)-1);
		   //printf("%d\n",strlen(token)-1);
		   /*Str append Example
				char str[strlen(token) + strlen(FindFileData.cFileName)];
				strcpy (str,"these ");
				 strcat (str,"strings ");
				 strcat (str,"are ");
				 strcat (str,"concatenated.");
				 printf("%s\n",str);
			*/
		   //List files
			hFind = FindFirstFile(token, &FindFileData);
			do{
				_tprintf (TEXT("File Found: %s%s\n"),FindFileData.cFileName,token);
			}while(FindNextFile(hFind, &FindFileData));
			FindClose(hFind);

           // Get next token: 
           token = strtok( NULL,"\r\n"); // C4996
       }
	free(buffer);
return	0;
}

[m4ster r0shi]

rain wrote:

How To create char with dynamic size?

Like this:

char * array = new char[size];
//...
delete[] array;

More info here -> http://cplusplus.com/doc/tutorial/dynamic/

rain wrote:

How to remove last symbol of string?

Put a '\0' in the place of the last symbol.

Though, it would be much easier for you to do the whole thing using std::string to hold the strings and fstream for file i/o.

Info on string -> http://cplusplus.com/reference/string/string/
Info on fstream file i/o -> http://cplusplus.com/doc/tutorial/files/

[rain]

Thanks.

I got question while I was digging in string pages.

Is there diference between char and string? I found that char is array, but sin't string array too? And is there any diference in speed?