SendMessage Method :cannot evaluate expression because a native frame is on top of the call stack
hi gurus,
i getting message "cannot evaluate expression because native frame on top of call stack" while executing sendmessage method. method performs operation i.e click final button , complete process , 1 "save as" window pops up, then here stuck every time. have tried publish code , run same situation coming.
i have 2 question after doing hell lot of google...
question 1: why control getting stuck every time @ sendmessage?
question 2: how can windows handle of save window can close during execution of sendmessage method.
code body
[dllimport("user32.dll", charset = charset.auto, setlasterror = true)]
private static extern intptr sendmessage(intptr hwnd, uint msg, int wparam, int lparam);
public void buttonhandles()
{
thread.sleep(10000);
try
{
process[] processes1 = process.getprocessesbyname("<processname>");
foreach (process p1 in processes1)
{
if (findwindowex(p1.mainwindowhandle, intptr.zero, null, "&finalize") != intptr.zero)
{
autobuttonhandle = findwindowex(p1.mainwindowhandle, intptr.zero, null, "&finalize");
thread.sleep(10000);
}
// while check if finalize button clicked or not do
{
if (autobuttonhandle == intptr.zero)
{
autobuttonhandle = findwindowex(p1.mainwindowhandle, intptr.zero, null, "&finalize");
}
try
{
if (nstateclickreturn == intptr.zero)
{
//below method having issue. control stuck here.
nstateclickreturn = sendmessage(autobuttonhandle, bm_click, intptr.zero,intptr.zero);
}
sendkeys.sendwait("{enter}");
}
catch (system.threading.threadabortexception e)
{
console.writeline(e.stacktrace);
}
// nstateclickreturn = postmessage(autobuttonhandle, bm_click, 0, 0);
checkforredactiontofinish();
//thread.sleep(10000);
} while (nstateclickreturn == intptr.zero || autobuttonhandle == intptr.zero);
}
// thread.sleep(10000);
//process[] processes3 = process.getprocessesbyname("docmgr");
//foreach (process p3 in processes3)
//{
// ////the button's caption "send" , "button"
// if (findwindowex(p3.mainwindowhandle, intptr.zero, null, "&save") != intptr.zero)
// {
// autobuttonhandle1 = findwindowex(p3.mainwindowhandle, intptr.zero, null, "&save");
// thread.sleep(10000);
// //buttonhandle 0 thats think problem
// sendmessage(autobuttonhandle1, bm_click, intptr.zero, intptr.zero);
// }
//}
}
catch (win32exception e)
{
console.writeline(e.stacktrace);
}
}
if (autobuttonhandle == intptr.zero)
{
autobuttonhandle = findwindowex(p1.mainwindowhandle, intptr.zero, null, "&finalize");
}
try
{
if (nstateclickreturn == intptr.zero)
{
//below method having issue. control stuck here.
nstateclickreturn = sendmessage(autobuttonhandle, bm_click, intptr.zero,intptr.zero);
}
hi nitin797,
there's logic error in code snippet think. if handle autobuttonhandle intptr.zero, sendmessage method still called.
[dllimport("user32.dll", charset = charset.auto, setlasterror = true)] private static extern intptr sendmessage(intptr hwnd, uint msg, int wparam, int lparam); also can see, 3rd , 4th parameter of method of type int, in code send 2 intptrs it. won't compile. doubt if have tested code in project.
please post whole error message , stack trace can furtherly investigate problem.
to troubleshoot problem, recommend firstly make example project call sendmessage method, make sure works ok proper signature. try not use try-catch block debug code step step.
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Visual Studio Languages , .NET Framework > Visual C#
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