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POGet tooltips text from C# with PInvoke
primarykey
Id
7512080
data
AcceptedAnswerId
7522883
AnswerCount
2
ClosedDate
CommentCount
6
CommunityOwnedDate
CreationDate
2011-09-22T08:50:38.200
FavoriteCount
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LastActivityDate
2011-09-23T00:01:44.970
LastEditDate
2011-09-22T13:51:44.187
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PostTypeId
1
Score
1
ViewCount
2459
LastEditorDisplayName
text
Body
I'm using PInvoke in C#, trying to read tooltips visible in a window with a known handler, but the apps who's windows I try to inspect in this manner crash with memory access violation errors, or simply don't reveal the tooltip text in the lpszText TOOLINFO member. I'm calling <a href="http://pinvoke.net/default.aspx/user32/EnumWindows.html" rel="nofollow">EnumWindows</a> with a callback and then sending a message to the tooltip window in that function: <pre><code>public delegate bool CallBackPtr(IntPtr hwnd, IntPtr lParam); static void Main(string[] args) { callBackPtr = new CallBackPtr(Report); IntPtr hWnd = WindowFromPoint(<mouse coordinates point>); if (hWnd != IntPtr.Zero) { Console.Out.WriteLine("Window with handle " + hWnd + " and class name " + getWindowClassName(hWnd)); EnumWindows(callBackPtr, hWnd); Console.Out.WriteLine(); } public static bool Report(IntPtr hWnd, IntPtr lParam) { String windowClassName = getWindowClassName(hWnd); if (windowClassName.Contains("tool") && GetParent(hWnd) == lParam) { string szToolText = new string(' ', 250); TOOLINFO ti = new TOOLINFO(); ti.cbSize = Marshal.SizeOf(typeof(TOOLINFO)); ti.hwnd = GetParent(hWnd); ti.uId = hWnd; ti.lpszText = szToolText; SendMessage(hWnd, TTM_GETTEXT, (IntPtr)250, ref ti); Console.WriteLine("Child window handle is " + hWnd + " and class name " + getWindowClassName(hWnd) + " and value " + ti.lpszText); } return true; } </code></pre> Here's how I defined the TOOLINFO structure: <pre><code>[StructLayout(LayoutKind.Sequential)] public struct RECT { private int _Left; private int _Top; private int _Right; private int _Bottom; } struct TOOLINFO { public int cbSize; public int uFlags; public IntPtr hwnd; public IntPtr uId; public RECT rect; public IntPtr hinst; [MarshalAs(UnmanagedType.LPTStr)] public string lpszText; public IntPtr lParam; } </code></pre> the TTM_GETTEXT value <pre><code>private static UInt32 WM_USER = 0x0400; private static UInt32 TTM_GETTEXT = (WM_USER + 56); </code></pre> and the <a href="http://pinvoke.net/default.aspx/user32/SendMessage.html" rel="nofollow">SendMessage</a> overload <pre><code>[DllImport("user32.dll", CharSet = CharSet.Auto)] static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, ref TOOLINFO lParam); </code></pre> So, is there any obvious error that I'm missing in my code, what should I change so that this situation is resolved? Edit: <a href="http://codeupload.com/4297" rel="nofollow">Here</a> is the whole code, so you could test.
Tags
<c#><pinvoke><tooltip><sendmessage>
Title
Get tooltips text from C# with PInvoke
singulars
PostAcceptedAnswerId
1. PO
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 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USluvieere
UserOwnerUserId
1. USluvieere
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PostLinksPostIdRelatedPostId
1. PL
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 LinkTypeLinkTypeId
 LTLinked
2. PL
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 LTLinked
PostLinksRelatedPostIdPostId
1. PL
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 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PostTypePostTypeId
 PTAnswer
2. PO
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 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
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 PostPostId
 POGet tooltips text from C# with PInvoke
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

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