C# Discussion Boards - CodeProject

Member 119488412-Sep-04 7:45

Member 1194884

12-Sep-04 7:45

Thanks for your help
I try to adapt for wath I want but only works with a string if a define on delegate

some class src.tools ...
public delegate void test1Event(main1.sub1 Reg);

form1
public event src.tools.teste1Event DataChanged

will not work. Reg.val1 we always =0
if i try to read by Reg.Tostring(); I got "main1.sub1+Reg"

best Regards

OMG | :OMG:

DanyBoy

Re: C# send arraylist between forms

Member 119488412-Sep-04 7:50

Member 1194884

12-Sep-04 7:50

sorry its working Thanks..... Big Grin | :-D

DanyBoy

HC_SKIP

Hadi Fakhreddine12-Sep-04 1:35

Hadi Fakhreddine

12-Sep-04 1:35

Hi,
I'm trying to implement a journal playback proc in C#...the journal record seems to be working fine...however the HC_SKIP in playback proc seems to never get reached...apparently windows keeps calling the playback proc with code HC_GETNEXT only...so i can't advance to the next message until HC_SKIP is called...has anyone ever had this issue?
Thanks

How do you handle inserting " ' " character in program?

ting66812-Sep-04 1:16

ting668

12-Sep-04 1:16

Hi How do you handle inserting " ' " character in program?

e.g

sqlcommand.CommandText = "INSERT INTO Table1 VALUES ('" + value1 + "', '" + value2 + "')";

if value1 is "'" (single quotation), it will cause error. To solve this, it is need to test value1 have got single quotation or not. If yes, insert one more single quotation before the original one. However, I think it is too trouble. Is there any other way to solve it? Thanks!

Re: How do you handle inserting " ' " character in program?

Hadi Fakhreddine12-Sep-04 1:42

Hadi Fakhreddine

12-Sep-04 1:42

You can use the Replace() function.
Use it before executing the sqlcommand:
It is of the form:
Replace(TheString, WhatToReplace, ReplaceItWithWhat)

So apply it this way on all your variables before inserting them into the sqlcommand string:

Replace(value1, "'", "''")
Replace(value2, "'", "''")

Cheers
Cool | :cool:

Re: How do you handle inserting " ' " character in program?

mav.northwind12-Sep-04 1:47

mav.northwind

12-Sep-04 1:47

Hi!
I think you really should use parameterized queries. That way you don't have to worry about such things as how to place your quotes and are less prone to SQL injection attacks.

mav

Illegal Cross Thread Opperation

eggie511-Sep-04 15:37

eggie5

11-Sep-04 15:37

Is there a way to make VS.net 2005 ignore the "Illegal Cross Thread Opperation" in debug mode?

/\ |_ E X E GG

Re: Illegal Cross Thread Opperation

eggie511-Sep-04 17:41

eggie5

11-Sep-04 17:41

Nevermind, this is the solution...

private void button1_Click(object sender, EventArgs e)
{
    Thread nThread = new Thread(delegate()
    {
        int i=0;
        while (i < progressBar1.Maximum)
        {
            progressBar1.Invoke((MethodInvoker)delegate
            {
                progressBar1.Value = i++;
            });
            Thread.Sleep(500);
        }
    });
    nThread.Start();
}

"Reason:
The UI controls are not thread safe. Previous versions of .Net would
allow these thread-unsafe to be made, but they will cause weird things
to happen (often resulting in the application just disappearing)
eventually. .Net 2 detects these bad cross-thread calls, and raises an
exception.

When in another thread, you should invoke all UI control methods using
BeginInvoke and EndInvoke rather than directly."

http://www.dotnet247.com/247reference/msgs/54/272634.aspx[^]

/\ |_ E X E GG

TrackBar in a ToolStrip

eggie511-Sep-04 10:31

eggie5

11-Sep-04 10:31

Does anybody know how to put a trackbar in a toolstrip?

/\ |_ E X E GG

Capturing Window, I got C++ code - please help!

nantcom11-Sep-04 8:21

nantcom

11-Sep-04 8:21

I was looking for a way to capture a window and render it with Direct 3D as my little research on how microsoft create their new hardware accelerated desktop Big Grin | :-D

and i got this from expert exchange

<br />
HDC hdc = GetDC(hwndExplorer);<br />
HDC hdcMem = CreateCompatibleDC(hdc);<br />
RECT r;<br />
GetClientRect(hwndExplorer, &r);<br />
HBITMAP hbm = CreateBitmap(r.right - r.left, r.bottom - r.top, 1, 32, NULL);<br />
HGDIOBJ hbmOld = SelectObject(hdcMem, hbm);<br />
SendMessage(hwndExplorer, WM_PRINT, (WPARAM)hdcMem, PRF_CHILDREN | PRF_CLIENT);<br />

I have tried to convert it (with my little knowledge :S) to this:

<br />
IntPtr victim = API.FindWindow( null, null );<br />
API.GetClientRect( victim, out victimClientArea );<br />
Bitmap b = new Bitmap(  victimClientArea.Width, victimClientArea.Height );<br />
<br />
Graphics gB = Graphics.FromImage( b );<br />
IntPtr hdcB = gB.GetHdc();<br />
<br />
API.SendMessage( victim, (uint)API.WMDefs.WM_PRINT, hdcB, (IntPtr)(API.PRF_CHILDREN | API.PRF_CLIENT | API.PRF_OWNED) );<br />

i got blank bitmap from this code ?
Can anyone help me out!?!?

Re: Capturing Window, I got C++ code - please help!

Nick Parker11-Sep-04 10:05

Nick Parker

11-Sep-04 10:05

Check out the following article here on Code Project: Image Capture[^]

- Nick Parker
My Blog | My Articles

Re: Capturing Window, I got C++ code - please help!

nantcom11-Sep-04 19:20

nantcom

11-Sep-04 19:20

Thanks! The code works, but it require the window you want to capture to be active.
Otherwise, you will get whatever inside the area of that window :S

i change the capture code from:

<br />
GDI32.BitBlt(capHDC,0,0,width,height,wndHDC,x,y,GDI32.SRCCOPY); <br />

to:

<br />
USER32.SendMessage( wndHWND, Constants.WM_PRINT, capHDC, (IntPtr)( Constants.PRF_CHILDREN + Constants.PRF_CLIENT + Constants.PRF_OWNED ) );<br />

and i can capture anything anywhere - even the window is not inside the screen - but the problem is...i can't capture another application's window!!! Confused | :confused:

what happended this time ???
Do i have to get special permission for my application to send messsage to another window?

Found the way!

nantcom11-Sep-04 22:10

nantcom

11-Sep-04 22:10

There is a API called PrintWindow. Big Grin | :-D

<br />
[DllImport("user32.dll", SetLastError=true)]<br />
static extern IntPtr PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);<br />

Battery status in c#

nocture11-Sep-04 6:43

nocture

11-Sep-04 6:43

Hi.. i've been trying to get the status of the battery on my laptop, but cant get the thing to work.
here's my code (in my main class)

public struct SystemPowerStatus
{
byte ACLineStatus;
byte batteryFlag;
byte batteryLifePercent;
byte reserved1;
int batteryLifeTime;
int batteryFullLifeTime;
}

[DllImport("kernel32.dll")]
public static extern bool GetSystemPowerStatus(ref SystemPowerStatus systemPowerStatus2);

private void form_load(object sender, EventArgs e)
{
MessageBox.Show("i want to print the battery % status here - how?");
}

how do i make it print out the battery status in the message box ? Can't get the thing to work Frown | :(

Re: Battery status in c#

Nick Parker11-Sep-04 7:26

Nick Parker

11-Sep-04 7:26

Try something like the following:

[DllImport("Kernel32")]
private static extern Boolean GetSystemPowerStatus(SystemPowerStatus sps);
[StructLayout(LayoutKind.Sequential)]
public class SystemPowerStatus
{
        public ACLineStatus _ACLineStatus;
        public BatteryFlag  _BatteryFlag;
        public Byte         _BatteryLifePercent;
        public Byte         _Reserved1;
        public Int32        _BatteryLifeTime;
        public Int32        _BatteryFullLifeTime;
}

public enum ACLineStatus : byte
{
    Offline = 0, Online = 1, Unknown = 255
}

public enum BatteryFlag : byte
{
        High = 1,
        Low = 2,
        Critical = 4,
        Charging = 8,
        NoSystemBattery = 128,
        Unknown = 255
}

Your usage would look like this for example:

private void button1_Click(object sender, EventArgs e)
{
    SystemPowerStatus sps = new SystemPowerStatus();
    GetSystemPowerStatus(sps);
    if (sps != null)
    {
        MessageBox.Show(string.Format("Current battery life is at {0}%.", sps._BatteryLifePercent));
    }
}

- Nick Parker
My Blog | My Articles

Re: Battery status in c#

nocture11-Sep-04 7:53

nocture

11-Sep-04 7:53

it gives me an error, which says sps does not contain a definition for _BatteryLifePercent... if I let intellisense show the possibilites of sps it just gives me ToString(), GetHashCode(), Equals and so on

Re: Battery status in c#

Nick Parker11-Sep-04 8:15

Nick Parker

11-Sep-04 8:15

I've updated the post, I forgot to copy over the class from my project in the post.

- Nick Parker
My Blog | My Articles

Re: Battery status in c#

nocture11-Sep-04 8:29

nocture

11-Sep-04 8:29

looks like its working.. thanks Smile | :)

ListView DisplayMember

eggie511-Sep-04 4:46

eggie5

11-Sep-04 4:46

What is the ListView's equivalent of ListBox's DisplayMember?

/\ |_ E X E GG

Re: ListView DisplayMember

Baris Kurtlutepe11-Sep-04 8:04

Baris Kurtlutepe

11-Sep-04 8:04

Unlike the ListBox control, the ListView control does not have a DisplayMember nor does it have a DataSource, ValueMember or any similar property. Because these are properties inherited from ListControl and ListView control is not inherited from that.

If you're going to implement data binding in a ListView control, you'll have to do so by yourself and depending on the structure, you have to populate the ListView's headers, item collection and -if any- subitems manually.

Re: ListView DisplayMember

eggie511-Sep-04 10:29

eggie5

11-Sep-04 10:29

OK, thanks.

/\ |_ E X E GG

Help with XML

krisst_k10-Sep-04 23:31

krisst_k

10-Sep-04 23:31

Hello! I'm a bit confused with an xml program i'm doing. The program goes through a xml-file wich is designed something like this:

<item>
<title> title </title>
<link>link</link>
<description>description</description>
</item>
<item>
... and so on

when it goes through the file i want it to make an instance of a class called Item everytime it finds the start of an item element, then fill the Item class fields (wich are title,link,description) and then put it in a Item array. But i can't get it to work at all.. Could someone give me some hint or anything?

Thanks!

Re: Help with XML

Anonymous10-Sep-04 23:33

Anonymous

10-Sep-04 23:33

Hmm, it seems like my xml-code got wiped! well, the root-elemtent(?) is Item, and then it has elements called title,link,description in it

Converting Keys to Chars

User 12301610-Sep-04 23:25

User 123016

10-Sep-04 23:25

Hi,

I'm overriding the ProcessDialogKey(Keys keyData) method of a textbox to handle keyboard input. Does anyone know how to convert the Keys values into characters? The usual letters and digits are no problem (A-Z, 1-9), because:

Keys.A = (int)'A' => (char)Keys.A = 'A'

But I can't handle some of the other keys. For example, if the user hits ";", the result of (char)keyData is some weird character ((char)192).

Is it possible to convert a Keys value to a character depending on the current user's keyboard layout? I don't want to use a large switch statement, because that doesn't consider different layouts (e.g. ";" = "ö" in German keyboard layout).

It has to be possible, because after all, the normal textbox just does that, doesn't it? I tried KeyConverters and some API-calls (toascii), but nothing seems to work right.

Any help would be highly appreciated, because I already spent hours on that (shame on me).

Re: Converting Keys to Chars

EssOEss11-Sep-04 1:10

EssOEss

11-Sep-04 1:10

Interesting problem indeed. I also cannot find a solution. Perhaps try overriding protected virtual bool ProcessDialogChar(char charCode); instead? It gives you the char right away.

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