Problem with dllimport code included .

Hi everyone,
Can you have a quick look and tell me why the caret is not shown , any help will be greatly appreicated
thank you.
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;
using System.Runtime. InteropServices ;

namespace test
{

public class Form1 : System.Windows. Forms.Form
{
private System.Windows. Forms.Button button1;
private System.Windows. Forms.Button button2;

private System.Componen tModel.Containe r components = null;

public Form1()
{

InitializeCompo nent();

}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code

private void InitializeCompo nent()
{
this.button1 = new System.Windows. Forms.Button();
this.button2 = new System.Windows. Forms.Button();
this.SuspendLay out();
//
// button1
//
this.button1.Lo cation = new System.Drawing. Point(456, 240);
this.button1.Na me = "button1";
this.button1.Ta bIndex = 2;
this.button1.Te xt = "button1";
this.button1.Cl ick += new System.EventHan dler(this.butto n1_Click);
//
// button2
//
this.button2.Lo cation = new System.Drawing. Point(456, 280);
this.button2.Na me = "button2";
this.button2.Ta bIndex = 3;
this.button2.Te xt = "button2";
this.button2.Cl ick += new System.EventHan dler(this.butto n2_Click);
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(616, 334);
this.Controls.A dd(this.button2 );
this.Controls.A dd(this.button1 );
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHan dler(this.Form1 _Load);
this.ResumeLayo ut(false);

}
#endregion
[STAThread]
static void Main()
{
Application.Run (new Form1());
}

[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool SetCaretPos(int X, int Y);
[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool ShowCaret(IntPt r hWnd);

[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool HideCaret(IntPt r hWnd);
private void Form1_Load(obje ct sender, System.EventArg s e)
{
}

private void button2_Click(o bject sender, System.EventArg s e)
{
HideCaret(this. Handle);
}

private void button1_Click(o bject sender, System.EventArg s e)
{
ShowCaret(this. Handle);
SetCaretPos(10, 10);
}
}

}

[Vadym Stetsyak]

Just a hint: maybe it is necessary to create a caret at fist via
CreateCaret?.

if SetCaretPos returns false, try to obtain error code with GetLastError (
kernel32.dll )
--
Vadym Stetsyak aka Vadmyst

<Co**********@a l.com> wrote in message
news:uk******** *********@newsf e5-gui.ntli.net...

Hi everyone,
Can you have a quick look and tell me why the caret is not shown , any help will be greatly appreicated thank you.
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;
using System.Runtime. InteropServices ;

namespace test
{

public class Form1 : System.Windows. Forms.Form
{
private System.Windows. Forms.Button button1;
private System.Windows. Forms.Button button2;

private System.Componen tModel.Containe r components = null;

public Form1()
{

InitializeCompo nent();

}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code

private void InitializeCompo nent()
{
this.button1 = new System.Windows. Forms.Button();
this.button2 = new System.Windows. Forms.Button();
this.SuspendLay out();
//
// button1
//
this.button1.Lo cation = new System.Drawing. Point(456, 240);
this.button1.Na me = "button1";
this.button1.Ta bIndex = 2;
this.button1.Te xt = "button1";
this.button1.Cl ick += new System.EventHan dler(this.butto n1_Click);
//
// button2
//
this.button2.Lo cation = new System.Drawing. Point(456, 280);
this.button2.Na me = "button2";
this.button2.Ta bIndex = 3;
this.button2.Te xt = "button2";
this.button2.Cl ick += new System.EventHan dler(this.butto n2_Click);
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(616, 334);
this.Controls.A dd(this.button2 );
this.Controls.A dd(this.button1 );
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHan dler(this.Form1 _Load);
this.ResumeLayo ut(false);

}
#endregion
[STAThread]
static void Main()
{
Application.Run (new Form1());
}

[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool SetCaretPos(int X, int Y);
[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool ShowCaret(IntPt r hWnd);

[DllImport("User 32.dll", CharSet=CharSet .Auto)]
public static extern bool HideCaret(IntPt r hWnd);
private void Form1_Load(obje ct sender, System.EventArg s e)
{
}

private void button2_Click(o bject sender, System.EventArg s e)
{
HideCaret(this. Handle);
}

private void button1_Click(o bject sender, System.EventArg s e)
{
ShowCaret(this. Handle);
SetCaretPos(10, 10);
}
}

}

[eran.sandler]

Just a quick tip about DLLImport.

If you want GetLastError to actually work for you, I suggest adding the
SetLastError=Tr ue to the DllImport.

For example:
[DllImport("User 32.dll", CharSet=CharSet .Auto, SetLastError=Tr ue)]
public static extern bool HideCaret(IntPt r hWnd);

This will make sure the LastError IS set when existing this function.

Eran
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