working with encryption, how can i get this code working?

[pspjoke]

main.c

#include <iostream.h>
#include <stdio.h>
#include <stdlib.h> 

int main(void) {
FILE * pFile;
long lSize;
char * buffer;
char u;
char key[11]="ABCDEFGHIJ";


pFile = fopen ("myfile.txt" , "rb");
 
if (pFile==NULL){
   cout<<"no data in file...";
   system("pause");}
else{
     fseek (pFile , 0 , SEEK_END);
     lSize = ftell (pFile);
     rewind (pFile); 
     buffer = (char*) malloc (lSize);
//     char string[lSize]=(char*) malloc (lSize);
     if (buffer == NULL) cout<<"the buffer is null";
     fread(buffer, 1, lSize, pFile); 
//     fclose(pFile);
     cout<<"File contains: "<<buffer<<"\nsize of file is "<<lSize<<"  bytes.\n",buffer,lSize;
//     free(buffer);
     system("pause");
     char string[lSize]=buffer;
     for(int x=0; x<lSize; x++){
     string[x]=string[x]^key[x];
     printf("\nstring: %i",string);}
     system("pause");
     return 0;
}}

error

Compiler: Default compiler
Building Makefile: "D:\C++\My Prog's\Testing\Makefile.win"
Executing  make...
make.exe -f "D:\C++\My Prog's\Testing\Makefile.win" all
g++.exe -c main.cpp -o main.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include"  -I"C:/Dev-Cpp/include/c++/3.4.2/backward"  -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32"  -I"C:/Dev-Cpp/include/c++/3.4.2"  -I"C:/Dev-Cpp/include"   

In file included from C:/Dev-Cpp/include/c++/3.4.2/backward/iostream.h:31,
                 from main.cpp:1:
C:/Dev-Cpp/include/c++/3.4.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
main.cpp: In function `int main()':

main.cpp:30: error: variable-sized object `string' may not be initialized

make.exe: *** [main.o] Error 1

Execution terminated

makefile auto generated by Dev-C++

i have tried various things to get this working, fixed some previous errors and now i can get this last one fixed.. :/

[ZiNgABuRgA]

Basically error says what it means - you can't declare a variable sized array.

char string[lSize]=buffer;

The variable in between the square brackets is illegal.

Use malloc() to do the job, eg:

char *string = (char*)malloc(lSize);
memcopy( ... stick something here ... );

BTW, I wouldn't consider XOR'ing much of an encryption algorithm :P

[pspjoke]

yea but im new and right now thats the only one i know how to use.

btw i got this fixed in this thread http://forums.consoleworld.net/showthread.php?tid=2039.