How to join a string to a variable of type BYTE path[]

Question

Guys, my question is how to put string1 from a function strcat(string1,string3); within a string of grabbing windows code user name:system("reg add HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /t REG_SZ /v NOME_DO_SEU_PROGRAMA /d $string1");

#include <iostream>
#include <cstdio>
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>


int main()
{

//pegando usuario do windows

//WINBASEAPI BOOL WINAPI GetUserNameA (LPSTR,PDWORD);

//WINBASEAPI BOOL WINAPI GetUserNameW(LPWSTR,PDWORD);

char acUserName[100];
char destino11[100];
DWORD nUserName = sizeof(acUserName);
char destino[200];
if (GetUserName(acUserName, &nUserName)) {


}   



//movendo 


    int ret;
    char oldname[] = "config/config.exe";
    char string1[] = "C:\\Users\\";
    strcat(string1,acUserName);
    char string3[] = "\\Searches\\config.exe";
    strcat(string1,string3);


  ret = rename(oldname, string1);

   if(ret == 0) {
      printf("File renamed successfully");
   } else {
      printf("Error: unable to rename the file");
   }




//ADICIONAR REGISTRO AQUI AQUI COMO COLOCAR A VARIAVEL STRING1 AI DENTRO DO SYSTEM???

system("reg add HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /t REG_SZ /v NOME_DO_SEU_PROGRAMA /d $string1");






    return 0;
    system("pause");     

}

Answer 1

In C you will need to create a char array that is the size of the two strings in order to concatenate.
Take a look at this example.

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

int main(){
    char string1[] = "reg add HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /t REG_SZ /v NOME_DO_SEU_PROGRAMA /d ";
    char string2[] = "Qualquer coisa que você quiser aqui";
    //Cria a stringTemp que tem que ser do tamanho da string1 + string2;
    char stringTemp[strlen(string1)+strlen(string2)];
    //Joga o conteúdo da string1 em stringTemp
    strcpy(stringTemp,string1);
    //Joga o conteudo da string2 no FINAL da stringTemp, concatenando as duas
    strcat(stringTemp,string2);

    printf("%s",stringTemp);
    //Aqui você pode chamar assim:
   //system(stringTemp);
 return 0;
}

You can test this code above here.