Handle

Code:

---

        case WM_COMMAND:
                {
                        if(LOWORD(wParam) == BN_CLICKED && (HWND)lParam == hbtnGetHandle)
                        {
                                char * caption = "";
                                caption = (char *)GetWindowText(htxtGetWindow,
                                                        (LPTSTR) caption, 25);
                                new_hwnd = FindWindow(NULL, (LPCTSTR)caption);
                        }
                }
                break;

---

There is something wrong here. It does not seem to create a handle from the caption of the app the user entered. :( I don't think the type-casts i made are right. Can anyone please help me fix that :) Thanks

Code:

---

int len = GetWindowTextLength(hWnd);
TCHAR *pcBuf = new TCHAR[len+1];
GetWindowText(hWnd, pcBuf, len);

// use pcBuf -- possibly in FindWindow

delete[] pcBuf;

---

Ok, thanks a lot :)

What is TCHAR for?

Somehow I thought you'd ask that ;)

Normally, you're using ASCII/ANSI. In this, all characters are represented by a single byte (char). For Unicode, it's a 16-bit character set, requiring two bytes (unsigned short). If you look at the definitions for any text-handling functions in the API they have definitions for GetWindowTextA, GetWindowTextW :) A is ANSI, W is Wide (Unicode). TCHAR swaps between char and unsigned short depending on compile options.

So it can be either?

Yes. If you define _UNICODE and UNICODE in your preprocessor project settings it will do it all for you. Unfortunately it'll then give loads of compiler errors on your no-doubt un-localised string literals ;)

I'm going now anyway, but look up TCHAR and character sets on MSDN for detailed information.

This one does not use the A or the W. (sorry, but that is the thing i need to work on :))

Instead of using char, I should use TCHAR?

this won't change the caption, like it should do:

Code:

---

//get the length of the typed-caption
                                int cpt_len = GetWindowTextLength(htxtGetWindow);
                                //int wnd_len; //caption of the alien window

                                TCHAR  *pcBuf = new TCHAR[cpt_len];//edit text holder
                                //retrieve the text from the edit box
                                GetWindowText(htxtGetWindow, pcBuf, cpt_len);

                                //finally, get the handle
                                new_hwnd = FindWindow(0, (LPCTSTR)pcBuf);
                               
                                //retrieve the caption of the alien window, so it can
                                //be restored later...
                                /*wnd_len = GetWindowTextLength(new_hwnd);
                                pcOldCaption = new TCHAR[wnd_len + 1];
                                GetWindowText(new_hwnd, pcOldCaption, wnd_len);*/
                                SetWindowText(new_hwnd, "mmmmm");

---

I don't see why it won't change the caption to mmmmmm.

Look at the definitions in the headers. GetWindowText is actually a macro that points to GetWindowTextA/W depending on compile options. This is why all the VB definitions have A appended to them :)

Yes, you should use TCHAR, _T("string"), and all the rest of the nice gibberish that comes with internationalisation :)

Are you sure that the window you specified exists?