SetFocus error

This is a discussion on SetFocus error within the Windows Programming forums, part of the Platform Specific Boards category; I have just recieved the handle of an Edit box in another application. I want to put some text in ...

  1. #1
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    SetFocus error

    I have just recieved the handle of an Edit box in another application. I want to put some text in there.

    Does the control have to have focus before i place text in there?

    I looked up MSDN, it gave me the syntax:
    Code:
    SetFocus(handle);
    when i use this i gives me the error:
    [C++Error] my_IP_suite_keygen.cpp(61): Extra parameter in call to _fastcall Forms::TCustomForm::SetFocus().

    so i tried:
    Code:
    SetFocus(handle);
    when i use this i gives me the error:
    [C++Error] my_IP_suite_keygen.cpp(61): Pointer to structure required on left side of -> or ->*.

    I use Borland C++ Builder 3, win 2000 Pro

    Also what function do i use to set the text?

    SetWindowText()
    PosMessage()

    Is one more appropiate that the other?

    Thanks.

  2. #2
    mustang benny bennyandthejets's Avatar
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    1. How did you get the edit control's handle?

    2. Both of your codes are the same

    3. I think you have to use PostMessage() or SendMessage(), because the edit control is in another process. SetWindowText() and GetWindowText() prevent inter-process communication.
    benforbes@optusnet.com.au
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  3. #3
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    i used

    Code:
    hBut = FindWindowEx(hWnd, hBut, "TEdit", NULL);
    i used spy++ yo check the handle is right

  4. #4
    mustang benny bennyandthejets's Avatar
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    I don't think you need to have the second parameter as hBut, unless you're enumerating the controls.

    I looked up MSDN, it gave me the syntax:

    code:--------------------------------------------------------------------------------
    SetFocus(handle);
    --------------------------------------------------------------------------------

    when i use this i gives me the error:
    [C++Error] my_IP_suite_keygen.cpp(61): Extra parameter in call to _fastcall Forms::TCustomForm::SetFocus().

    so i tried:

    code:--------------------------------------------------------------------------------
    SetFocus(handle);
    --------------------------------------------------------------------------------
    What should the second code fragment actually be?
    benforbes@optusnet.com.au
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  5. #5
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    ah isee.

    the second bit of code
    Code:
    ::SetFocus(hBut)
    i also tried:
    Code:
    hBut->SetFocus()
    none worked.

    to set the text i tried
    Code:
    PostMessage(hBut, WM_SETTEXT, NULL, (LPARAM)(LPCTSTR)"hey");
    which also didn't work

  6. #6
    mustang benny bennyandthejets's Avatar
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    Post all your code.

    What's the target application? It may require certain security privileges.
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  7. #7
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    Code:
    //---------------------------------------------------------------------------
    #include <process.h>
    #include <stdlib.h>
    #include <time.h>
    #include <vcl.h>
    #include <Windows.h>
    #pragma hdrstop
    
    #include "my_IP_suite.h"
    
    //---------------------------------------------------------------------------
    
    #pragma package(smart_init)
    #pragma resource "*.dfm"
    TForm1 *Form1;
    
    //---------------------------------------------------------------------------
    
    __fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
    {
        //const char *appPath = "C:\\Program Files\\My IP Suite\\MyIPSuite.exe";
    
        //execl(appPath, appPath, NULL);
    
        HWND hWnd;      //window handle
        HWND hBut;      //control handle
    
        // get handle of Reminder window
        hWnd = FindWindow(NULL, "Reminder");
    
        if(! hWnd) exit(0);     //if window don't found, exit program
    
        //move through controls, get handle of command button
        hBut = FindWindowEx(hWnd, NULL, "TButton", NULL);
        hBut = FindWindowEx(hWnd, hBut, "TButton", NULL);
    
        //click command button
        PostMessage(hBut, BM_CLICK, NULL, NULL);
    
    
        //get title of Options window
        hWnd = FindWindow(NULL, "Options");
    
        char buff[] = "HOI";
    
    
        if(! hWnd) exit(0);     //if window don't found, exit program
    
        //move through controls, get handle of edit box
        hBut = FindWindowEx(hWnd, NULL, "TButton", NULL);
        hBut = FindWindowEx(hWnd, hBut, "TButton", NULL);
        hBut = FindWindowEx(hWnd, hBut, "TEdit", NULL);
        hBut = FindWindowEx(hWnd, hBut, "TEdit", NULL);
        hBut = FindWindowEx(hWnd, hBut, "TEdit", NULL);
    
    
        PostMessage(hBut, WM_SETTEXT, NULL, (LPARAM)(LPCTSTR)"hey");
    
    
        //PostMessage(hBut, WM_SETTEXT, 0, (LPARAM)(LPCTSTR)"HI");
        //::SetFocus(hBut);
        //SetWindowText(hBut, buff);
    
    }
    
    //---------------------------------------------------------------------------

  8. #8
    mustang benny bennyandthejets's Avatar
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    1. You're sure the final value of hBut is the correct handle?

    2. Try using SendMessage() instead of PostMessage()

    3. Try SetFocus(hBut) not ::SetFocus(hBut)

    4. Maybe the class TEdit can't be used in this way. Can you give me some info on that class?
    benforbes@optusnet.com.au
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  9. #9
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    ok, sendmessage worked. how simple.

    thanks for your help

  10. #10
    mustang benny bennyandthejets's Avatar
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    What about SetFocus(hBut)? Did you get that to work?
    benforbes@optusnet.com.au
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  11. #11
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    no i didn't. I just though the control might to have focus before i could set the text.

    But there is no need for setfocus anymore

  12. #12
    mustang benny bennyandthejets's Avatar
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    I suspect that you can't use SetFocus() on a control in another process. I think using AttachThreadInput() would allow this, but I guess you don't need it.

    I find it interesting that you were able to send a pointer to a string between processes, and it still worked.

    Is this what you did?
    Code:
    SendMessage(hBut, WM_SETTEXT, NULL, (LPARAM)(LPCTSTR)"hey");
    And it actually displayed "hey"?
    benforbes@optusnet.com.au
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  13. #13
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    ok ill look up AttachThreadInput() . no doubt ill need it sometime.

    yeah, thats the code, and yeah it worked

  14. #14
    mustang benny bennyandthejets's Avatar
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    It shouldn't have worked. That pointer points to a text string in YOUR process's virtual memory area. The other process shouldn't have access to that memory area. What version of Windows are you running?
    benforbes@optusnet.com.au
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  15. #15
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    Windows 2000 Pro

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