Tooltip

Is there anything wrong in this piece of code?

Code:

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void CreateToolTip(HWND hwndParent, RECT rectTip, LPWSTR lpTipString){
    HWND hwndTT = CreateWindowEx(WS_EX_TOPMOST,
                TOOLTIPS_CLASS, NULL,
        WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP,               
        CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT,
        hwndParent, NULL, hInst,NULL);

    SetWindowPos(hwndTT, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);

    TOOLINFO ti = { 0 };
    ti.cbSize = sizeof(TOOLINFO);
    ti.uFlags = TTF_SUBCLASS|TTF_IDISHWND;
    ti.hwnd = hwndParent;
    ti.hinst = hInst;
    ti.lpszText = lpTipString;
    ti.rect = rectTip;

    SendMessage(hwndTT, TTM_ADDTOOL, 0, (LPARAM) (LPTOOLINFO) &ti);       
}

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I call this function in my WM_CREATE / WM_INITDIALOG, but I never see a tooltip if
the mouse hovers the rect. I do call InitCommonControlsEx() before.

?

At first glance:

1. Get rid of SetWindowPos().
2. Replace the CreateWindowEx with a normal CreateWindow - no TopMost.
3. Set the ID in the TOOLINFO struct.
4. Don't forget to activate the tooltips.

Code:

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SendMessage(hwndTT, TTM_ACTIVATE, TRUE, 0);


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5. If you are using any sort of wrapper (MFC, .NET, ATL), don't forget to enable tooltips on the parent window.


-Erik

Use CreateWindowEx. Using CreateWindow may render tooltips inoperable in older versions of windows.
You can use CreateWindow, but to be on the safe side add WS_EX_TOOLWINDOW extended style. You do not have to use WS_EX_TOPMOST but using it should not do any harm.

You can indeed get rid of SetWindowPos call but it is irrelevant.

Fill TOOLINFO properly. This is a cause of your problem. If you are adding rectangle as a tool, you cannot use TTF_IDISHWND flag. If you add more rectangles, than you would have to assign ID that is unique for each rectangle. I your case it is 0.

In conclusion, removing TTF_IDISHWND flag is a fix you need.

Code:

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    TOOLINFO ti = {0};
    ti.cbSize = sizeof(TOOLINFO);
    ti.uFlags = TTF_SUBCLASS;//|TTF_IDISHWND;
    ti.hwnd = hwndParent;
    ti.hinst = hInst;
    ti.lpszText = lpTipString;
    ti.rect = rectTip;

    SendMessage(hwndTT, TTM_ADDTOOL, 0, (LPARAM)&ti);

---

You do not have to activate tooltips, since they are created as active. Use TTM_ACTIVATE to disable/enable tooltips if needed later in the code.

Thanks for the answers, I adapted my the code but still, no tooltip is showing up.
It looks like this now:

Code:

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case WM_INITDIALOG:{
                ...
                InitCommonControls();
                CreateToolTip(hWnd, rectStatus, L"Test", TT_TEST);
                ...

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I tried InitCommonControlsEx() also, but I don't think that is the problem.
TT_TEST is defined as 20001.
rectStatus is defined global as RECT rectStatus = {70, 310, 480, 350}; which is a rectangle
within my dialog client window.

Code:

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void CreateToolTip(HWND hwndParent, RECT rectTip, LPWSTR lpTipString, UINT uId){
    HWND hwndTT = CreateWindowEx(WS_EX_TOPMOST|WS_EX_TOOLWINDOW,
                TOOLTIPS_CLASS, NULL,
        WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP,               
        CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT,
        hwndParent, NULL, hInst,NULL);

    TOOLINFO ti                = { 0 };
    ti.cbSize                = sizeof(TOOLINFO);
    ti.uFlags                = TTF_SUBCLASS;
    ti.hwnd                = hwndParent;
    ti.hinst                = hInst;
    ti.lpszText                = lpTipString;
    ti.rect                = rectTip;
        ti.uId                = uId;

    SendMessage(hwndTT, TTM_ADDTOOL, 0, (LPARAM) (LPTOOLINFO) &ti);       
}

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I don't get a tooltip when I hover the mouse over rectTip.

Something must be wrong with your rectangle coordinates.
Just for a test initialize it to 0, 0, 200, 100. This will allow you to test left upper corner area.

If you still have problems, post your code. I always test my solution before posting and it works for me.

I'm pretty much helpless on that too.
The rectangle is ok, I'm drawing it with FillRect().

I'm using exactly the code I posted, I Just changed the InitCommonControls() with InitCommonControlsEx() with almost every flag.

Well, It also does not work when I setup a tooltip for any control in my dialog. Just nothing happens. Other applications on my machine can create tooltips so it must be something on my code or environment.

I'm compiling a win32 api application, written in C. Using MSVS 2008.

Help

It has nothing to do with Rectangle coordinates.
See Google Groups where the reason why it dosn't work has been explained hundreds of times...

Great comment.
Are you kidding me? Just paste a link to whatever you mean if you know for sure what
the problem is about.

Quote:

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Originally Posted by me earlier

If you still have problems, post your code.

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As I said it works for me. Tested on Vista and XP.
From the code snippet you have posted, I do not see any reason for failure. I am not able to determine what is wrong without seeing code for entire application.
Maybe something you do in a main loop prevents working?