Write/ReadProcessMemory help

I want my program to read a pointer whose adress is 0x111111 then add 0x111 to the adress which the pointer holds and write 0x0 to the new adress how can i do that with write and readmemory apis

i tried like that but could not succed what is the problem?

Code:

[LRESULT CALLBACK PencereProseduru (HWND AnaPencereTutmaci, UINT message, WPARAM wParam, LPARAM lParam)
{   
        char Dugme1Ismi[256];
        HWND HedefTutmac;
        DWORD ProsesKimligi, Alan=0x111111, AlinanAlan, HedefAlan;
        HANDLE Islem;
        BYTE eDegistirilen[1]={0x0};
        BOOL a, b;
        
    switch (message)         
    {   case WM_COMMAND:
             if(LOWORD(wParam) == 1 && HIWORD(wParam) == BN_CLICKED)
                    {
                        GetWindowText(Dugme1Tutmaci, Dugme1Ismi, sizeof(Dugme1Ismi));
                            if (strcmp(Dugme1Ismi, "Durdur")== 0) 
                            {SetWindowText (Dugme1Tutmaci,"Çalıştır");}
                            else
                            {SetWindowText (Dugme1Tutmaci, "Durdur");
                             HedefTutmac = FindWindow (NULL,"sdsmnd");
                                  if (HedefTutmac == NULL)
                                  {MessageBox(0, "Pencere bulunamadı", "Olumsuz", MB_OK);}
                                  else
                                  {
                                   GetWindowThreadProcessId (HedefTutmac ,&ProsesKimligi);
                                   Islem = OpenProcess(PROCESS_ALL_ACCESS,0, ProsesKimligi);
                                       if (!Islem)
                                       {MessageBox (NULL,"Tutmac alınamadı", "Olumsuz", MB_OK);}
                                       else
                                       {
                                            if(ReadProcessMemory (Islem, (LPVOID)Alan, &AlinanAlan, 4, NULL))
                                            {
                                              HedefAlan = AlinanAlan + 0x111;
                                                  if(WriteProcessMemory(Islem, (LPVOID)HedefAlan, &eDegistirilen, 4 , NULL))
                                                  {CloseHandle(Islem);}
                                                  else
                                                  {MessageBox (NULL,"Hafıza bölgesine yazılamadı", "Olumsuz", MB_OK);}
                                            }
                                            else
                                           {MessageBox (NULL, "Hafıza bölgesi okunamadı", "Olumsuz", MB_OK);}
                                       }
                                  }
                            }
                    }
             break;                             
        case WM_DESTROY:
            PostQuitMessage (0);  
            break;
        default:  
            return DefWindowProc (AnaPencereTutmaci, message, wParam, lParam);
    }

    return 0;
}

You can do what you are wanting, however, you are not doing it the correct way. One major consideration to keep in mind is whether or not you need to gain privs to do this.

Possibly enabling the debug privileges before calling ReadProcessMemory and WriteProcessMemory.