LITTLEBLACKDOG.COM

Stray Dog Joined: 08 Mar 2007 Posts: 1

This is a C# question.

For this line of code

Quote:
if (((&msg).Msg == 256 || (&msg).Msg == 260) && keyData == Keys.Escape)

I am getting these errors:

Quote:
Pointers and fixed size buffers may only be used in an unsafe context

Quote:
You can only take the address of an unfixed expression inside of a fixed statement initializer

Quote:
Operator '.' cannot be applied to operand of type 'System.Windows.Forms.Message*'

The underlined parts of the code that are incorrect are (&msg).Msg and (&msg).Msg.

The second place I am having problems with is

Quote:
TimerCallback timerCallback1 = new TimerCallback(this.TimerCode0);
timer0 = new System.Timers.Timer(timerCallback1, null, 0, 60000);
TimerCallback timerCallback2 = new TimerCallback(this.TimerCode1);
timer1 = new System.Timers.Timer(timerCallback2, null, 1000, 5000);
TimerCallback timerCallback3 = new TimerCallback(this.TimerCode2);
timer2 = new System.Timers.Timer(timerCallback3, null, 0, 500);
TimerCallback timerCallback4 = new TimerCallback(this.TimerCode3);
timer3 = new System.Timers.Timer(timerCallback4, null, 5000, 20);

The error is

Quote:
No overload for method 'Timer' takes '4' arguments

The part of the code that is underlined as incorrect is TimerCallback and everything in parenthesis after that.

And finally the last part I am having problems is.

Quote:
if ((int)strs1.Length > 1)
{
timer1.Change(0, Convert.ToInt32(strs1[1]));
}
label.Top = base.Height / 2 - label.Height / 2;
label.Left = base.Width / 2 - label.Width / 2;
}
else if (Code0[i].Substring(0, 6) == "")
{
stnpanel2.BringToFront();
string[] strs2 = Code0[i].Substring(6, Code0[i].Length - 13).Split(new char[] { Convert.ToChar("^") });
if ((int)strs2.Length > 1)
{
long l = Convert.ToInt32(strs2[1]);
timer1.Change(l, l);
}
else
{
timer1.Change(5000, 5000);
}
ie2.Navigate(strs2[0], ref arg1, ref arg2, ref arg3, ref arg4);
}

The first error has to do with the Change part of timer1.Change.

This is the error;

Quote:
'System.Windows.Form.Timer' does not contain a definition for 'Change'

The second error has to do with the ie2.Navigate(strs2[0], ref arg1, ref arg2, ref arg3, ref arg4); Part and the error is:

No overload for method 'Navigate' takes '5' arguments

Quote:

All help is really appreciated, I have been banging my head against this for 2 weeks.

~Nauntilus

Posted: Fri Mar 09, 2007 2:04 am Post subject:

Firstly, welcome to the forum!

Stick around and get to know us.

Nauntilus wrote:
This is a C# question.

For this line of code

Quote:
if (((&msg).Msg == 256 || (&msg).Msg == 260) && keyData == Keys.Escape)

I am getting these errors:

Quote:
Pointers and fixed size buffers may only be used in an unsafe context

Quote:
You can only take the address of an unfixed expression inside of a fixed statement initializer

Quote:
Operator '.' cannot be applied to operand of type 'System.Windows.Forms.Message*'

The underlined parts of the code that are incorrect are (&msg).Msg and (&msg).Msg.

The first and second errors means you are trying to do something naughty. Taking the memory address of an object is usually a no-no in a managed environment. (The last error is probably just an artifact of using the wrong indirection operator on a pointer, but as it says, pointers aren't allowed in this context anyway.)

Try the following:

Code: Select all

if ((msg.Msg == 256 || msg.Msg == 260) && keyData == Keys.Escape)

Nauntilus wrote:
The second place I am having problems with is

Quote:
TimerCallback timerCallback1 = new TimerCallback(this.TimerCode0);
timer0 = new System.Timers.Timer(timerCallback1, null, 0, 60000);
TimerCallback timerCallback2 = new TimerCallback(this.TimerCode1);
timer1 = new System.Timers.Timer(timerCallback2, null, 1000, 5000);
TimerCallback timerCallback3 = new TimerCallback(this.TimerCode2);
timer2 = new System.Timers.Timer(timerCallback3, null, 0, 500);
TimerCallback timerCallback4 = new TimerCallback(this.TimerCode3);
timer3 = new System.Timers.Timer(timerCallback4, null, 5000, 20);

The error is
Quote:
No overload for method 'Timer' takes '4' arguments

The part of the code that is underlined as incorrect is TimerCallback and everything in parenthesis after that.

This one is self-explanatory, really. If you look up the documentation for the System.Timers.Timer object:

http://msdn2.microsoft.com/en-us/library/system.timers.timer.timer.aspx

You will see that it has only two constructors, none of which have four parameters.

You probably meant to use the System.Threading.Timer object, which has the constructor that you are trying to use:

http://msdn2.microsoft.com/en-us/library/system.threading.timer.timer.aspx

Nauntilus wrote:
And finally the last part I am having problems is.

Quote:
if ((int)strs1.Length > 1)
{
timer1.Change(0, Convert.ToInt32(strs1[1]));
}
label.Top = base.Height / 2 - label.Height / 2;
label.Left = base.Width / 2 - label.Width / 2;
}
else if (Code0[i].Substring(0, 6) == "")
{
stnpanel2.BringToFront();
string[] strs2 = Code0[i].Substring(6, Code0[i].Length - 13).Split(new char[] { Convert.ToChar("^") });
if ((int)strs2.Length > 1)
{
long l = Convert.ToInt32(strs2[1]);
timer1.Change(l, l);
}
else
{
timer1.Change(5000, 5000);
}
ie2.Navigate(strs2[0], ref arg1, ref arg2, ref arg3, ref arg4);
}

The first error has to do with the Change part of timer1.Change.

This is the error;

Quote:
'System.Windows.Form.Timer' does not contain a definition for 'Change'

The second error has to do with the ie2.Navigate(strs2[0], ref arg1, ref arg2, ref arg3, ref arg4); Part and the error is:

Quote:
No overload for method 'Navigate' takes '5' arguments

All help is really appreciated, I have been banging my head against this for 2 weeks.

~Nauntilus

The first error is pretty similar to the one we had before. You are trying to use a System.Windows.Forms.Timer object. Look up the documentation for it:

http://msdn2.microsoft.com/en-gb/library/system.windows.forms.timer_members.aspx

You will see it has no Change method. Once again, you probably meant to use a System.Threading.Timer object, which has the method that you are trying to use:

http://msdn2.microsoft.com/en-us/library/system.threading.timer_members.aspx

As for the second error, it's not obvious to me what type of object ie2 is, so I can't look that one up.

The long and the short of it is that all of these errors look like they can be solved by taking a closer look at the documentation. You should probably take some time to get to know the MSDN Library.

Finally, I neither use nor know C# in any great depth, so most of this is 'psychic debugging' on my part. I hope it helps.