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No, since i do a If (InvokeRequired) at the top of the method.
Regards,
Gareth.
(FKA gareth111)
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Hmm. There's one problem I've seen with InvokeRequired - it returns false if the control's underlying Win32 handle hasn't been created. And that happens if the control hasn't become visible yet.
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The control is visible but not enabled.
Regards,
Gareth.
(FKA gareth111)
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Hi Gareth,
I know your post is 3 month ago ... but I have the same problem seen right now.
I can fill the tree a hundred time with no problem and then it happens after the third call.
I didn't found a way to unlock the control - did you ?
Until a better idea is supplied I don't use BeginUpdate()
Regards,
Frank
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Frank,
The problem with my code was that i was doing an:
If (InvokeRequired)
On the main control class, which always returned false when the problem occurred, but the actaul TreeView control was returned true for InvokeRequired.
Thus, the solution was to invoke on the TreeView control. If you need some more info, just say.
Regards,
Gareth.
(FKA gareth111)
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Gareth,
thank you for your answer,
I see your problem was different, but I have the problem of a treeview lock when using BeginUpdate / EndUpdate.
My program worked 4 years without error under .NET 1.1 and I got the problems changing to .NET 2.0 SP1 - why ever.
I have nothing running in parallel tasks or threads which could interfere my program.
I left BeginUpdate / EndUpdate unused - no problem any more.
But that leaves no good feeling.
Regards,
Frank
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Friends,
Im new to C#.. Using menustrip...
wants to open other form in main form itself, inspite of opening it in new.
code written in menu button
{
Attendence att = new Attendence();
att.Show();
}
This open form in new window.
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It sounds like you want an MDI application. Set the Main Form's IsMdiContainer property to true, set the child form's MdiParent property to the MainForm before calling Show.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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private void sendSMSToolStripMenuItem1_Click(object sender, EventArgs e)
{
Attendence main = new Attendence();
main.ISPARENT// I DIDNT FIND THIS
main.Show();
}
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MdiParent. Set the Attendence form's MdiParent property to the owner form. Set the owner form's IsMdiContainer property to true
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I need to use midiInGetErrorText[^]. I've managed to get it to work by using a StringBuilder with it's Capacity set to UInt16.MaxValue, and passing the StringBuilder to the second parameter and it's Capacity to the third.
public string GetErrorText(Result error)
{
StringBuilder resultBuilder = new StringBuilder();
resultBuilder.Capacity = UInt16.MaxValue;
Functions.midiInGetErrorText((UInt16)error, resultBuilder, (UInt16)resultBuilder.Capacity);
return resultBuilder.ToString();
}Is this the correct way?
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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DaveyM69 wrote: Is this the correct way?
I don't think so, setting the capacity actually allocates a char array of that size.
Set a reasonable capacity, then use P/Invoke:
public string GetErrorText(Result error) {
StringBuilder resultBuilder = new StringBuilder(300);
Functions.midiInGetErrorText((UInt16)error, resultBuilder, (UInt16)resultBuilder.Capacity);
return resultBuilder.ToString();
}
BTW: I wouldn't be surprised if the integers needed 32-bit, hence (int) instead of (UInt16)
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Luc Pattyn wrote: I wouldn't be surprised if the integers needed 32-bit
I wondered about that. I've examined several implementations for other winmm functions and some have used int, some uint and some ushort. Is there any definitive way to find out? (I believe all the original constants and prototypes are in mmsys.h - I don't know if that's an original 16 bit C file or a newer 32bit C++ one.)
[Edit] I assumed it was using 16 bit as the midiInProc callback passes a dw that contains 4 bytes - therefore a word should contain 2 [/Edit]
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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I don't know the finer details of all those fancy integer (and string!) types in C and C++.
Most of the time it says int or DWORD, both being 32-bit.
Be warned about long and char, they differ in .NET versus native.
signed/unsigned does not matter.
To find out, either delve into the header files, or just try. With a pointer in the list, one will work,
the others will fail.
BTW: there is that nice MAXERRORLENGTH constant, that (if not too large) would be the right capacity once you know its value.
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That constant is declared:
#define MAXERRORLENGTH 256 /* max error text length (including NULL) */
but some of the strings returned by the function are longer 
(the file is actually MMSystem.h)
255 works fine 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
modified on Saturday, April 25, 2009 9:26 AM
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Found this MSDN page[^] that states what data types to use in the managed world
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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hii i change font of textbox several times but when i tried to change font in hindi and run my project it shows blank squares on typing in textbox, also i have hindi fonts installed pls help me with this problem.
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Removing the Bold would help everyone else - blank squares are preferable to that! 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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sorry sir but that is not working anything else
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Hello there,
I have the setup for Visual Studio.NET 2008 but it is in .iso format. I searched google and found that it was an image file. How can I install Visual Studio 2008 from it? Will I have to burm it to a CD or DVD? or is there any software to do that job for me? I dont have a DVD writer, but I know that the setup would require 2 CD disks then. Please help me..... Please..... Its really urgent!
Thanx,
Rajdeep.NET
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YOu require, PowerISO software to read ISO files.
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This VS2008 ISO wouldn't be a pirate, would it? If so, remember you gave your email when you registered here? No so clever, was it?
I'm sorry but you are behaving a bit judge jury and executioner here. You asked him if it was pirate when you had clearly already made your mind with your "no so clever" comment. If you had any clue, you would realise that ISO is a very common method of distributing software to many people such as:
An MSDN subscription for a company.
Or more likely and as in my case via the MSDN Academic Alliance that provides free VS and other things to students who's universities are part of it in ISO format.
And besides, what do you really think is going to happen even if it was pirate, Microsoft is clearly going to file a lawsuit against one guy on one of the millions of forums out there on the premise that his e-mail address was not generated by 10 minute mail or just created as a false one?
Perhaps think next time before you start accusing people without knowing really what the situation is.
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