C++ How to make that a function runs only one - c++

Question

I use a C++\CLR project in Visual Studio 2017.At the time i try to manipulate the memory so i create a hack for a no name game and try to manipulate the game.
My problem is that I try to create a random integer and for that i use the function rand() in combination with firstSetRand srand().
using namespace System;
int * randomName()
{
srand((unsigned)time(0));
int i = 1;
static int name[5];
for (int i = 1; i < 5; i++)
{
name[i] = 97 + rand() % 122;
}
std::cout << name << std::endl;
return name;
}
This is my function for the random counts and here i call it:
int main(array<System::String ^> ^args)
{
while (true)
{
switch (inputCheat) //check which case match with the user input
{
case 4:
Console::WriteLine("test: ");
random:: randomName(firstSetRand);
//WriteProcessMemory(handle, (LPVOID)localName, &inputNumber, sizeof(), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
}
}
Sleep(200);
}
The problem is because that´s a while(true) loop and I call the function multiple times. And I don't know how to make that srand() function is only called once time i get always the same random number.
I am coming from Java. In Java i would do the whole code in a class and than i would write the variable in the constructor but i think that's not possible in C++. Because when i do the whole code in a class i get the error:
Severity Code Description Project File Line Suppression State
Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main##YAHXZ) AssaultCubeHack C:\Users\schup\source\repos\AssaultCubeHack\AssaultCubeHack\MSVCRTD.lib(exe_main.obj) 1
Here is the full code of my project:
// AssaultCubeWithClr.cpp: Hauptprojektdatei.
#include "stdafx.h"
using namespace System;
struct InitRandHelper
{
InitRandHelper() { srand((unsigned)time(0)); }
};
int * randomName()
{
static InitRandHelper init;
int i = 1;
static int name[5];
for (int i = 1; i < 5; i++)
{
name[i] = 97 + rand() % 122;
}
std::cout << name << std::endl;
return name;
}
void StartText()
{
//Text to See in the Console
Console::ForegroundColor = System::ConsoleColor::Green;
Console::WriteLine("Welcome to my Cheat for AssaultCube!");
Console::WriteLine("------------------------------------");
Console::WriteLine("1. For More Health type in: 1.");
Console::WriteLine("2. For More Ammo type in: 2");
Console::WriteLine("3. For More Armor type in: 3");
Console::WriteLine("4. For Turn on Name changer: 4");
}
int main(array<System::String ^> ^args)
{
DWORD playerBaseAdress = 0x00509b74;
DWORD offsePrimaryAmmo = 0x128;
DWORD offsetPistolAmmo = 0x13C;
DWORD offsetArmor = 0xFC;
DWORD offsetHealth = 0xF8;
DWORD offsetRoll = 0x0080;
DWORD baseforName = 0x005028FC;
static bool firstSetRand = true;
int inputCheat;
int inputNumber;
DWORD processId;
DWORD localPlayer;
DWORD localName;
DWORD primaryAmmo;
DWORD pistolAmmo;
DWORD health;
DWORD armor;
DWORD roll;
bool firstExecute = true;
HWND hwnd = FindWindowA(NULL, "AssaultCube"); //Find Window with Name AssaultCube
StartText(); //function call
while (true)
{
if (hwnd == NULL) //Check if the game exists
{
if (firstExecute == true)
{
Console::ForegroundColor = System::ConsoleColor::Red;
Console::WriteLine("ERROR: The Game couldn´t found!");
firstExecute = false;
}
}
else
{
GetWindowThreadProcessId(hwnd, &processId); //Get Process id from the Window
HANDLE handle = OpenProcess(PROCESS_ALL_ACCESS, false, processId);
if (handle == NULL) //check if process id exsits
{
Console::ForegroundColor = System::ConsoleColor::Red;
Console::WriteLine("ERROR: Wrong Process Id!");
Console::ForegroundColor = System::ConsoleColor::Green;
}
else
{
ReadProcessMemory(handle, (LPCVOID)playerBaseAdress, &localPlayer, sizeof(playerBaseAdress), NULL); //Read the local adresse and save it in localPlayer
ReadProcessMemory(handle, (LPCVOID)baseforName, &localName, sizeof(playerBaseAdress), NULL);
primaryAmmo = localPlayer + offsePrimaryAmmo;
pistolAmmo = localPlayer + offsetPistolAmmo;
health = localPlayer + offsetHealth;
armor = localPlayer + offsetArmor;
roll = localPlayer + offsetRoll;
std::cin >> inputCheat; //wait for user input
switch (inputCheat) //check which case match with the user input
{
case 1:
Console::WriteLine("Write how much Health you want: ");
std::cin >> inputNumber;
WriteProcessMemory(handle, (LPVOID)health, &inputNumber, sizeof(inputNumber), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
case 2:
Console::WriteLine("Write how much Ammo you want: ");
std::cin >> inputNumber;
WriteProcessMemory(handle, (LPVOID)primaryAmmo, &inputNumber, sizeof(inputNumber), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
case 3:
Console::WriteLine("Write how much Armor you want: ");
std::cin >> inputNumber;
WriteProcessMemory(handle, (LPVOID)armor, &inputNumber, sizeof(inputNumber), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
case 4:
Console::WriteLine("Random Number: ");
randomName();
//WriteProcessMemory(handle, (LPVOID)localName, &inputNumber, sizeof(), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
case 5:
Console::WriteLine("test: ");
std::cin >> inputNumber;
WriteProcessMemory(handle, (LPVOID)roll, &inputNumber, sizeof(inputNumber), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
default:
Console::ForegroundColor = System::ConsoleColor::Red;
Console::WriteLine("ERROR: Wrong Entry!");
Console::WriteLine("Try a other input :D");
Console::ForegroundColor = System::ConsoleColor::Green;
break;
}
}
}
Sleep(200);
}
return 0;
}
Here you can see it doesn't work.

Answer 1

Solution 1
You can use a function static variable for that.
static bool firstTime = true;
if ( firstTime )
{
srand((unsigned)time(0));
firstTime = false;
}
Solution 2
If you don't want to pay the price of the check for each call of the function, you can use a helper class/struct.
struct InitRandHelper
{
InitRandHelper() { srand((unsigned)time(0)); }
};
int* randomName()
{
// Initialize the random number generator.
static InitRandHelper init;
int i = 1;
static int name[5];
for (int i = 1; i < 5; i++)
{
name[i] = 97 + rand() % 122;
}
std::cout << name << std::endl;
return name;
}
Solution 3
Call srand in main before the while loop begins.
int main(array<System::String ^> ^args)
{
srand((unsigned)time(0));
while (true)
{
switch (inputCheat) //check which case match with the user input
{
case 4:
Console::WriteLine("test: ");
random:: randomName(firstSetRand);
//WriteProcessMemory(handle, (LPVOID)localName, &inputNumber, sizeof(), NULL); //Write to the local adress memory and change the value
Console::WriteLine("\nWhat did you want to cheat up: ");
break;
}
}
Sleep(200);
}
and remove the call from random::randomName.

Answer 2

okay here the answer i found. Ther problem is this line:
std::cout << name << std::endl;
The Ouput in the console is not the value rather its the adress from the array. To do it proper i have to it so:
int i = 1;
static int name[5];
for (int i = 1; i < 5; i++)
{
name[i] = 97 + rand() % 122;
std::cout << name[i] << std::endl; //this line is the right thing to do it
}
return name;