In C++, WriteProcessMemory will not change value outside of VisualStudio - c++

Question

It changes the value while it's ran inside of Visual studio, but if I build the program and run the executable it does not actually change the value. Here is the code:
using namespace std;
DWORD pid;
DWORD players = 0x00883D70;
int playerCount = 0;
int readValue = 0;
int firstTime = 0;
int main()
{
HWND hWnd = FindWindowA(0, ("Diablo II"));
GetWindowThreadProcessId(hWnd, &pid);
HANDLE pHandle = OpenProcess(PROCESS_ALL_ACCESS, TRUE, pid);
if (firstTime == 0)
{
cout << "This is a tool to set the player count in Diablo II: Lord of Destruction v1.14D" << endl;
cout << "This tool was made by xElite_V." << endl;
cout << "You can set a number between 0 and 255 for player difficulty:" << endl;
}
else {
cout << "You can set a number between 0 and 255 for player difficulty:" << endl;
}
firstTime = 1;
cin >> playerCount;
WriteProcessMemory(pHandle, (LPVOID)players, &playerCount, sizeof(playerCount), 0);
main();
}
So I don't understand why it wouldn't do the same thing as it would while it's in visual studio.

Answer 1

You almost certainly have a permissions problem, but since your code doesn't check for errors properly, nobody can actually tell you for sure.
There's actually a bunch of stuff you need to do to get this to work, and there's some code that does that here:
https://stackoverflow.com/a/51346951/5743288
Note that this is calling ReadProcessMemory but the idea is the same.