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POFunction "SendMessage" of User32.dll does not work in Windows 8
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Id
18898748
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0
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2
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9
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CreationDate
2013-09-19T15:22:39.890
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0
LastActivityDate
2018-08-29T02:00:18.127
LastEditDate
2017-05-23T11:50:02.137
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-1
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730589
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0
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1
Score
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ViewCount
8002
LastEditorDisplayName
text
Body
I am developing a piece of software to extract some information from a external desktop application, the thing is that i am working in Windows 7 using C# and I have got a workable application that uses the stuff of here: <a href="https://stackoverflow.com/questions/18880330/how-can-i-retrieve-the-values-from-window-of-class-thunderrt6listbox-using-use/">How can I retrieve the values from window of class "ThunderRT6ListBox" using user32.dll in c#</a> But the problem comes when I test the same software against the same external application in Windows 8, it doesn't work in the same way. I can copy the handler id of the controls but when I use the SendMessage function, for example, to put a new text to a edit control (textbox), nothing is happened. <pre><code> public static void SetText(IntPtr HWnd, string strTextToSet) { var text = new StringBuilder(strTextToSet); SendMessage(HWnd, WM_SETTEXT, IntPtr.Zero, text); } </code></pre> Is there any consideration in Windows 8 when it used this stuff? UPDATE: Still it does not work. GetText works, but SetText doesn't. My code: <pre><code> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)] static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam); const uint WM_SETTEXT = 0x000C; public static string GetText(IntPtr hwnd) { var text = new StringBuilder(1024); if (SendMessageTimeoutText(hwnd, 0xd, 1024, text, 0x2, 1000, 0) != 0) { return text.ToString(); } return ""; } public static void SetText(IntPtr HWnd, string strTextToSet) { //var text = new StringBuilder(strTextToSet); IntPtr text = System.Runtime.InteropServices.Marshal.StringToCoTaskMemUni(strTextToSet); SendMessage(HWnd, WM_SETTEXT, IntPtr.Zero, text); } </code></pre> UPDATE 2: Error code: <pre><code> ModApi.SetText(hwEdit, "foo_namE"); //The textbox does not change int error_code = Marshal.GetLastWin32Error(); //error_code is 5 </code></pre>
Tags
<c#><windows><pinvoke>
Title
Function "SendMessage" of User32.dll does not work in Windows 8
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1. USdlopezgonzalez
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