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Button's tool tip can't show on WinXP platform.

Hi! I have a question about tooltips. I wrote a program running on WinXP platform. I try to make my program look like "Windows XP Visual Styles", so I use a XML format file to invoke ComCtl32.dll version 6 to make it work. As a result, my program DOES look like Windows XP Visual Styles, but the tooltips on all buttons are gone... I find that it fails when I use "SendMessage(TTM_GETCURRENTTOOL, 0, (LPARAM)&ti))" (Note. ti is TOOLINFO data type). I got a NULL value for ti data structure. Anybody knows what is happening? Please help me out... Thanks in advanced.    


Best Regards,

Jenny

p.s. the tooltips running on Win2000 is working properly.
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jennyhou
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jennyhou
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1 Solution
 
MichaelSCommented:
Can you show your code where you fill ti?
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ShaunWildeCommented:
have you set the cbSize member of you TOOLINFO structure?

ti.cbSize=sizeof(TOOLINFO);

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jennyhouAuthor Commented:
Hello! ShaunWilde,

Thanks for your tips. you remind me to focus on TOOLINFO "SIZE" issue. one of my friends wrote a piece of codes(a class which is derived from CToolTipCtrl) to deal with tooltips for me. That's the codes my friend wrote long time ago... I do not know why he used a user-defined structure just like TOOLINFO, but size is a little bit different. So That's why I got a NULL value for ti data structure except ti.cbSize.(I got incorrect ti.cbSize value) Thanks a lot!


Jenny  
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ShaunWildeCommented:
glad to help - a pitfall I usually do myself at least once a month
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MichaelSCommented:
Than it sounds strange that it worked under other OS.

>p.s. the tooltips running on Win2000 is working properly
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ShaunWildeCommented:
> Than it sounds strange that it worked under other OS.

may be maybe not - other OSs may not check the value as they will only fill in the minimum structure however later OS builds may have more to add to the structure so they will check the size value to know whether it is safe to do so - not an uncommon practice - just annoying as it makes you get away with bad code that works on one OS and doesn't on another

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