Openprocess failed: 0 hatası

#include <windows.h>
#include <iostream>

extern "C" __declspec(dllexport) bool lowinject(DWORD pid, const wchar_t* dllPath);

bool lowinject(DWORD pid, const wchar_t* dllPath) {
    HANDLE hProcess = OpenProcess(
        PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION |
        PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ,
        FALSE, pid);
    if (hProcess == NULL) {
        std::cerr << "OpenProcess failed: " << GetLastError() << "\n";
        return false;
    }

    size_t size = (wcslen(dllPath) + 1) * sizeof(wchar_t);
    LPVOID remoteMem = VirtualAllocEx(hProcess, NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    if (remoteMem == NULL) {
        std::cerr << "VirtualAllocEx failed: " << GetLastError() << "\n";
        CloseHandle(hProcess);
        return false;
    }

    if (!WriteProcessMemory(hProcess, remoteMem, dllPath, size, NULL)) {
        std::cerr << "WriteProcessMemory failed: " << GetLastError() << "\n";
        VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    HMODULE hKernel32 = GetModuleHandleW(L"kernel32.dll");
    if (!hKernel32) {
        std::cerr << "GetModuleHandleW failed: " << GetLastError() << "\n";
        VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    FARPROC loadLibraryAddr = GetProcAddress(hKernel32, "LoadLibraryW");
    if (!loadLibraryAddr) {
        std::cerr << "GetProcAddress failed: " << GetLastError() << "\n";
        VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    HANDLE hThread = CreateRemoteThread(hProcess, NULL, 0,
        (LPTHREAD_START_ROUTINE)loadLibraryAddr, remoteMem, 0, NULL);
    if (hThread == NULL) {
        std::cerr << "CreateRemoteThread failed: " << GetLastError() << "\n";
        VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
        CloseHandle(hProcess);
        return false;
    }

    WaitForSingleObject(hThread, INFINITE);

    DWORD exitCode = 0;
    if (!GetExitCodeThread(hThread, &exitCode)) {
        std::cerr << "GetExitCodeThread failed: " << GetLastError() << "\n";
    } else {
        std::cout << "Remote thread exit code: " << exitCode << "\n";
    }

    VirtualFreeEx(hProcess, remoteMem, 0, MEM_RELEASE);
    CloseHandle(hThread);
    CloseHandle(hProcess);

    return true;
}

  [DllImport("lowinj.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
  public static extern bool lowinject(uint pid, string dllPath);
 private void lowleveldllenjekteet(object sender, RoutedEventArgs e)
 {
     Window inputWindow = new Window()
     {
         Title = "İşleme dll enjekte et",
         Width = 350,
         Height = 200,
         WindowStartupLocation = WindowStartupLocation.CenterOwner,
         ResizeMode = ResizeMode.NoResize,
         Owner = this
     };

     StackPanel panel = new StackPanel() { Margin = new Thickness(10) };

     panel.Children.Add(new Label() { Content = "PID:" });
     TextBox pidTextBox = new TextBox() { Height = 25, Margin = new Thickness(0, 0, 0, 10) };
     panel.Children.Add(pidTextBox);
     panel.Children.Add(new Label() { Content = "DLL Yolu:" });
     TextBox dllPathTextBox = new TextBox() { Height = 25, Margin = new Thickness(0, 0, 0, 10) };
     panel.Children.Add(dllPathTextBox);

     Button okButton = new Button() { Content = "Tamam", Width = 70, HorizontalAlignment = HorizontalAlignment.Right };
     panel.Children.Add(okButton);

     inputWindow.Content = panel;

     okButton.Click += (s, ea) =>
     {
         try
         {
             if (!uint.TryParse(pidTextBox.Text, out uint pid))
             {
                 MessageBox.Show("PID geçersiz.");
                 return;
             }

             string dllPath = dllPathTextBox.Text;

             lowinject(pid, dllPath);

             MessageBox.Show($"PID: {pid}\nDLL Yolu: {dllPath}", "", MessageBoxButton.OK, MessageBoxImage.Information);

             inputWindow.Close();
         }
         catch (Exception ex)
         {
             MessageBox.Show($"{ex.Message}");
         }
     };

     inputWindow.ShowDialog();

 }