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/* Version specifically setup for use with WM_GETTEXT message */
[DllImport("user32.dll", EntryPoint = "SendMessageTimeout", SetLastError=true, CharSet=CharSet.Auto)]
public static extern uint SendMessageTimeoutText(
IntPtr hWnd,
int Msg, // Use WM_GETTEXT
int countOfChars,
StringBuilder text,
SendMessageTimeoutFlags flags,
uint uTImeoutj,
out IntPtr result);
/* Version for a message which returns an int, such as WM_GETTEXTLENGTH. */
[DllImport("user32.dll", EntryPoint = "SendMessageTimeout", CharSet = CharSet.Auto)]
public static extern int SendMessageTimeout(
IntPtr hwnd,
uint Msg,
int wParam,
int lParam,
uint fuFlags,
uint uTimeout,
out int lpdwResult);
<DllImport("user32.dll", SetLastError:=True)> _
Public Sub SendMessageTimeout(ByVal windowHandle As IntPtr,ByVal Msg As Integer,ByVal wParam As IntPtr,ByVal lParam As IntPtr,ByVal flags As SendMessageTimeoutFlags,ByVal timeout As Integer,ByRef result As IntPtr)
End Sub
<DllImport("user32.dll", SetLastError:=True)> _
Public Shared Function SendMessageTimeout(ByVal windowHandle As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByVal flags As SendMessageTimeoutFlags, ByVal timeout As Integer, ByRef result As IntPtr) As IntPtr
End Function
Notes:
None.
Tips & Tricks:
Used when propagating environment variables, for instance, updating the Path, without requiring a reboot: see also http://support.microsoft.com/kb/104011
Please add some!
Sample Code:
C# Sample Code
//Register the message
lMsg = Win32.RegisterWindowMessage("WM_HTML_GETOBJECT");
//Get the object
Win32.SendMessageTimeout(windowHandle, lMsg, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_ABORT_IF_HUNG, 1000, out lRes);
if(lRes != IntPtr.Zero)
{
//Get the object from lRes
htmlDoc= (mshtml.IHTMLDocument)Win32.ObjectFromLresult(lRes, IID_IHTMLDocument, IntPtr.Zero);
return htmlDoc;
}
C# WM_GETTEXTLENGTH example
const int NoResponse = -1;
const uint WM_GETTEXTLENGTH = 0x000E;
static int GetWindowTextLength(IntPtr hwnd) {
int length;
int result = SendMessageTimeout(hwnd, WM_GETTEXTLENGTH, 0, 0, 0X2C, 5, out length); //0X2C = SMTO_ABORTIFHUNG | SMTO_BLOCK | SMTO_NOTIMEOUTIFNOTHUNG | SMTO_ERRORONEXIT
if (result == 0) return NoResponse; else return length;
}
Alternative Managed API:
Do you know one? Please contribute it!
The SendMessageTimeout API
5/24/2013 5:25:27 AM - -204.187.150.35
SendMessageTimeout fuFlags
12/7/2014 12:49:56 PM - -196.25.255.250
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