How to find another program's MessageBox by WindowsAPI in C#?

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my problem : i'm trying to find another program's(made by mfc) MessageBox using FindWindow, FindWindowEx in WindowsAPI. But, i'm fall in infinite loop. How can i find it ?

i'm using this code.

                case 17: // target Program's Create Button

                    // Click
                    SendMessage(hWnd, WM.LBUTTONDOWN, 0, null);
                    SendMessage(hWnd, WM.LBUTTONUP, 0, null);
                    // -> Show MessageBox in Display

                    /******** here is Problem Code. (infinite loop) ********/
                    //int main = FindWindow(null, "Create Connecter"); // Parent
                    //main = FindWindowEx(main, 0, null, "Encode"); // MessageBox
                    // i'm tried to this code.. but, failed.

                    int main = FindWindow(null, "Encode"); // MessageBox
                    int finish = 0;
                    do {
                        finish = FindWindowEx(main, 0, null, "Encode");
                        textBox1.AppendText("Wating....");
                        System.Threading.Thread.Sleep(100);
                    } while (finish == 0);
                    textBox1.AppendText("Find MessageBox !!");
                    /********************************************************/

                    // OK Button Click in MessageBox
                    finish = FindWindowEx(finish, 0, "Button", "OK");
                    SendMessage(hWnd, WM.LBUTTONDOWN, 0, null);
                    SendMessage(hWnd, WM.LBUTTONUP, 0, null);

so.. 1. target Program's Create Button Click -> appeared MessageBox in target Program 2. i'm trying to find target program's MessageBox 3. i'm fall in infinite loop

somebody help me.. i want go to bed..

asked 31 secs ago

user3780345

1