Speed Hack Not Working

#include <iostream> //Noobz beware this has magic powers also it helps us output stuff
#include <windows.h> // Win32API (For Functions like FindWindow(0, "NullVoid")
using namespace std; // Ill kill you if you are trying to make hacks and still dont know what that is

int main(int argc, char *argv[])
{

    
    int nVal = 1237; // Declaring an int (Integer) that were going to use for changing the value of an address

    HWND hWND = FindWindow(0, "Calculator"); // Ok liek this totaly finds the Application with the name Calculator

    if(hWND == 0){ // Checking to see if hWnd == 0 (THis would mean that its not found)
        cerr << "Application not found" << endl; // Sending an error message telling the user App not found
    } else { //Else is basicly a function that says if 1 statement didn't occur then this one must (If you can't tell im mocking you GiggleBush2012)
        DWORD pID; // Im not even going to bother explaining a DWORD LOOK IT UP PLEASE (ill say raise the 8 bit flags)
        GetWindowThreadProcessId(hWND, &pID); // some more handles and stuff
        HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE,pID); // Open the process for penetration (hehe pentration)
    }

    if(hProc) { // that says if its false  then cerr a messsage

        cerr << "Process not detected please open it and try again" << endl;
    } else { //ZOMG THE 1337 hacks are injected into the main frame for leet winning ability
       int DidiInject =  WriteProcessMemory(hProc, (LPVOID)0x00380FE4, &nVal, (DWORD)sizeof(nVal),NULL); //Im sure you allready know this but in c++ all addys start with 0x (Saying its a hex address)
    }

    if(DidiInject > 0) {
        clog << "Yo Dawg we injected into the bank" << endl;

    }else{
        cerr << "Shit failed at the point of penetration" << endl;
    }

    return a.exec();
}