C# Discussion Boards - CodeProject

psyonara10-Jul-06 5:52

10-Jul-06 5:52

I am using SendMessage from the Win32 API to send keystrokes to the foreground window. The keystrokes do not arrive, though, somehow. I have checked, and the handle to the window that I get is correct. When I use SendMessage to send a character to the application itself it works, but not to another window.

I use the following API functions:

<br />
[DllImport("user32.dll")]<br />
public static extern int SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);<br />
		<br />
[DllImport("user32.dll")]<br />
public static extern IntPtr GetForegroundWindow();<br />

And the following to send the message:

<br />
char a = new char();<br />
a = 'A';<br />
this.WindowState = FormWindowState.Minimized;<br />
IntPtr handle = GetForegroundWindow();<br />
SendMessage(handle, (int)Win32API.Messages.Char, (IntPtr)a, (IntPtr)0);<br />

The char enum is set to 0x0102, which is equivalent to WM_CHAR.

Does anyone know what I'm doing wrong? I would appreciate some help!

Thanks!

Re: SendMessage problem

LongRange.Shooter10-Jul-06 8:16

LongRange.Shooter

10-Jul-06 8:16

Is the window within your application space? Security will prevent you from sending keystrokes to a window that is not within your application space unless you have a remoting solution that specifically marshals the request between each boundary.

Re: SendMessage problem

mav.northwind10-Jul-06 9:02

mav.northwind

10-Jul-06 9:02

You could try sending the additional messages that get generated when you press a key, as well (WM_KEYDOWN, WM_KEYUP)...

Regards,
mav

--
Black holes are the places where god divided by 0...

Hiding a control

joshp121710-Jul-06 5:21

joshp1217

10-Jul-06 5:21

Without Using Visible how can you hide a user control?

Re: Hiding a control

Ravi Bhavnani10-Jul-06 5:31

Ravi Bhavnani

10-Jul-06 5:31

Move it offscreen or set its size to (0,0).

/ravi

My new year's resolution: 2048 x 1536
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Re: Hiding a control

joshp121710-Jul-06 5:45

joshp1217

10-Jul-06 5:45

Moving the control offscreen? How is this done?

Re: Hiding a control

Ravi Bhavnani10-Jul-06 5:55

Ravi Bhavnani

10-Jul-06 5:55

Change its Location property.

/ravi

My new year's resolution: 2048 x 1536
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Re: Hiding a control

Jun Du10-Jul-06 5:59

Jun Du

10-Jul-06 5:59

Set a location (x, y) beyond the screen. Lets say, if your screen is 1280x1024, set (x, y) to (1600, 0).

Best,
Jun

Re: Hiding a control

Christian Graus10-Jul-06 8:17

Christian Graus

10-Jul-06 8:17

But check the Screens property as well, you may be moving it onto the second monitor.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Hiding a control

Andrew Lygin10-Jul-06 8:48

Andrew Lygin

10-Jul-06 8:48

MyControl.Parent = null;

This.Left

joshp121710-Jul-06 5:11

joshp1217

10-Jul-06 5:11

Can anyone tell me how exactly does this "this.Left" method work in conjunction with a form or user control?

Re: This.Left

Ravi Bhavnani10-Jul-06 5:17

Ravi Bhavnani

10-Jul-06 5:17

It returns the x coordinate of the control's left edge.

/ravi

My new year's resolution: 2048 x 1536
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Re: This.Left

Not Active10-Jul-06 5:19

Not Active

10-Jul-06 5:19

Gets or sets the distance, in pixels, between the left edge of the control and the left edge of its container's client area.

Seems pretty straight forward to me

Re: This.Left

Judah Gabriel Himango10-Jul-06 6:27

Judah Gabriel Himango

10-Jul-06 6:27

Mark Nischalke wrote:
Gets or sets the distance, in pixels, between the left edge of the control and the left edge of its container's client area.

Textbook answer. Smile | :)

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: This.Left

Not Active10-Jul-06 6:51

Not Active

10-Jul-06 6:51

When all else fails, RTFM Big Grin | :-D

Re: This.Left

wasife10-Jul-06 8:23

wasife

10-Jul-06 8:23

joshp1217 wrote:
how exactly does this "this.Left" method work

It basically gives the distance of the left edge of your control to the left edge of the container e.g. form,panel etc on which your control is lying.

Regards,
Wasif Ehsan.

Re: This.Left

Andrew Lygin10-Jul-06 9:14

Andrew Lygin

10-Jul-06 9:14

joshp1217 wrote:
...how exactly does this "this.Left" method work...

It's not a method at all. It is a property (a pair of methods in this case). You can use ildasm.exe to understand how it works exactly. It returns a value of the "x" field of the control when you get it. And it calls SetBounds(...) method when you set it.

-- modified at 15:15 Monday 10th July, 2006

comboBox with value & text

TAREQ F ABUZUHRI10-Jul-06 5:09

TAREQ F ABUZUHRI

10-Jul-06 5:09

in winApp

how can make comboBox have text that will display and value to this text ??

as in asp.net ??
but with WinApp ??????????

Palestine

Re: comboBox with value & text

TAREQ F ABUZUHRI10-Jul-06 5:20

TAREQ F ABUZUHRI

10-Jul-06 5:20

ex:
i have list of all country any city of the all world

i will give comboBox text as : France & value as 5
when use select France i will make new query with

this ID ==> 5

Palestine

Re: comboBox with value & text

Judah Gabriel Himango10-Jul-06 5:21

Judah Gabriel Himango

10-Jul-06 5:21

I'm not sure I understand. Could you clarify?

Tech, life, family, faith: Give me a visit.
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Re: comboBox with value & text

TAREQ F ABUZUHRI10-Jul-06 5:22

TAREQ F ABUZUHRI

10-Jul-06 5:22

ex:
i have list of all country any city of the all world

i will give comboBox text as : France & value as 5
when use select France i will make new query with

this ID ==> 5

Palestine

Re: comboBox with value and text

Judah Gabriel Himango10-Jul-06 6:24

Judah Gabriel Himango

10-Jul-06 6:24

So your problem, if I understand correctly, is that you need to attach an integer to a combo box item. This is pretty easy:

private class MyComboBoxItem
{
    public readonly string Text;
    public readonly int Value

    public MyComboBoxItem(string text, int value)
    {
        this.Text = text;
        this.Value = value;
    }

    public override string ToString()
    {
        return this.Text;
    }
}

// Code to add the "France" item to the combo box
MyComboBoxItem france = new MyComboBoxItem("France", 5);
myComboBox.Items.Add(france);

// The event handler that handles selection changed event.
void myComboBox_SelectedValueChanged(object sender, EventArgs e)
{
    MyComboBoxItem selectedItem = (MyComboBoxItem)myComboBox.SelectedItem;
    int value = selectedItem.Value;
}

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: comboBox with value and text

TAREQ F ABUZUHRI10-Jul-06 9:40

TAREQ F ABUZUHRI

10-Jul-06 9:40

Thanks so mutch man

thankss thanksssss

Palestine

Re: comboBox with value and text

Judah Gabriel Himango10-Jul-06 10:08

Judah Gabriel Himango

10-Jul-06 10:08

Glad I could help.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Messianic Instrumentals (with audio)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Re: comboBox with value & text

TAREQ F ABUZUHRI10-Jul-06 5:23

TAREQ F ABUZUHRI

10-Jul-06 5:23

the user will just see France

the value ==> 5 will be hiden

Palestine

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