Tooltip

[CatShoe]

Is there anything wrong in this piece of code?

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);	
}

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.

?

[egawtry]

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.

SendMessage(hwndTT, TTM_ACTIVATE, TRUE, 0);

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


-Erik

[JohnCz]

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.

    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.

[CatShoe]

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

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

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.

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);	
}

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

[JohnCz]

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.

[CatShoe]

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

[fred100]

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...

[CatShoe]

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

[JohnCz]

If you still have problems, post your code.

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?