Memory management - Free a process's memory - C# Discussion Boards

ekynox17-Dec-05 19:34

17-Dec-05 19:34

have you tried using the KeyDown eventhandler an example would be

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (Keys.F12.ToString() == e.KeyCode.ToString())
{
MessageBox.Show("F12 Key Pressed");
}
else
{
MessageBox.Show("F12 Key was not Pressed");
}
}

Re: How to activate F1 to F12 keys

leppie17-Dec-05 21:50

leppie

17-Dec-05 21:50

You might wanna enable KeyPreview on your container Form to in addition to method suggested by the other poster.

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Re: How to activate F1 to F12 keys

ayuba asia18-Dec-05 15:02

ayuba asia

18-Dec-05 15:02

thanks for the reply it works.

SendMessage stops my App

sirlantis17-Dec-05 14:27

sirlantis

17-Dec-05 14:27

I need to flush the IconCache. So i did this TweakUI thingy (iconsize - 1, refresh, iconsize + 1, refresh).

Key = Microsoft.Win32.Registry.CurrentUser;
Key = Key.OpenSubKey(@"Control Panel\Desktop\WindowMetrics", true);
Key.SetValue("Shell Icon Size", (Size-1).ToString());
SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0);
Key.SetValue("Shell Icon Size", Size.ToString());
SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0);
Key.Close();

i am using this DllImport
[DllImport("user32.dll")]
static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);

and these constants:
HWND_BROADCAST = 0xffff;
WM_SETTINGCHANGE = 0x001A
SPI_SETNONCLIENTMETRICS = 0x002A;

so i have the flush most of the time BUT the app stops at the 2nd send message somehow. anybody has an idea why?

Re: SendMessage stops my App

Jared Parsons17-Dec-05 20:36

Jared Parsons

17-Dec-05 20:36

Which app freezes? The one sending the message (code posted above) or the one that you're trying to get to update? If it's the one above it's probably another app not handling the broadcast fast enough. I believe that the SendMessage will not return in this case until all of the apps have handled HWND_BROADCAST. Can you change it to a PostMessage instead?

Jared Parsons
jaredp@beanseed.org
http://spaces.msn.com/members/jaredp/

System.ManagementObjectSearcher ' s constructor by sql clause...

Developer_117-Dec-05 13:53

Developer_1

17-Dec-05 13:53

Hi all.

I saing from the beginning : My English is very bad!!!:-OOk,i am asking my questions...

I ManagementObjectSearcher ' s wanting to use sql clause constructor.Which can i sql clause to this constructor???Can you give them list to me....

Example:
private static System.Management.ManagementObjectSearcher nesne=new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");

"SELECT * FROM Win32_DiskDrive" <<<<----- As Of this .I want to my can use sql clause...Please help me!!! Confused | :confused:

Thanks...

Re: System.ManagementObjectSearcher ' s constructor by sql clause...

Dave Kreskowiak17-Dec-05 17:36

Dave Kreskowiak

17-Dec-05 17:36

There is no list to give. WMI treats all of it's classes and instances like a database. You use WQL (SQL for WMI) to return the information you want out of this database.

Platform SDK: Windows Management Instrumentation - Querying with WQL[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Memory management - Free a process's memory

orenmh17-Dec-05 13:29

orenmh

17-Dec-05 13:29

Hi,
I'm writing a program that uses an external service.
My problam is that the external service does'nt free it's memory - and after a while it increases and slows the system. Programs like FreeRam or cacheman free the service memory (which is running in an exe process) with no problem.
I want to be able to free the process's memory using my own code. How do I do that? What API are involved and how do I use them?
Thanks

oren_mh

Re: Memory management - Free a process's memory

Colin Angus Mackay17-Dec-05 14:20

Colin Angus Mackay

17-Dec-05 14:20

orenmh wrote:
Programs like FreeRam or cacheman free the service memory (which is running in an exe process) with no problem

I've read reports of these programs. They are supposedly a sham and don't really do anything other than trick you into thinking that is has done something useful. Most of the time they make the overall situation worse.

An external process that has no knowledge of an application cannot force it to free RAM, it can only trick it into paging memory in RAM to the swap file. This means that more RAM is freed up, but slows down already running applications because they have to be swapped back to main memory in order to run at some later point.

orenmh wrote:
I want to be able to free the process's memory using my own code. How do I do that?

If you have the source code of the service, then you can re-write it to be more memory efficient.

orenmh wrote:
What API are involved and how do I use them?

DisplaceExistingProgramsToVirtualMemory()
{
    byte[] bigBlockOfMemory = new byte[1048576*512]; // Allocate half a gigabyte.
}

That ought to do it. If you have a lot of memory you might want to increase the amount allocated.

My: Blog | Photos

"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious

Bit fields in C#

Drot17-Dec-05 7:56

Drot

17-Dec-05 7:56

I want to make in C# something as the following structure in C:

struct {
short int i1:2;
short int i2:4;
short int i3:1;
short int i4:9;
} My_struct;

Drot

Re: Bit fields in C#

Jared Parsons17-Dec-05 10:51

Jared Parsons

17-Dec-05 10:51

AFAIK, there is no support for that type of structure in C#. You can do some hacking with bytes and properties to kinda get that experience.

Jared Parsons
jaredp@beanseed.org
http://spaces.msn.com/members/jaredp/

Re: Bit fields in C#

leppie17-Dec-05 21:56

leppie

17-Dec-05 21:56

BitVector32 might be of help, but it doesnt support ranges larger than 16 bits D'Oh! | :doh:

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Re: Bit fields in C#

tarasn19-Dec-05 23:24

tarasn

19-Dec-05 23:24

Use FlagsAttribute to make bit fields
[Flags]
public enum States:long
{
B_0000 = 0,
B_0001 = 1,
B_0010 = 2,
B_0100 = 4,
B_1000 = 8
}

DevIntelligence.com - My blog for .Net Developers

Add data to an ArrayList

Duif17-Dec-05 6:08

Duif

17-Dec-05 6:08

Hi, i try to add data from an Access-database to an ArrayList, so far so good, but something goes wrong, can someone help me...??

public List<cd> cdListe = new List<cd>();

public FyldListe()

{

string dbForbindelse = "provider=Microsoft.Jet.OLEDB.4.0; " + "data
source = C:\\databasenavn.mdb";

string HentAlleData = "SELECT nr, art, model, årgang, navn FROM
oversigt";

OleDbDataAdapter DataAdapter = new OleDbDataAdapter(HentAlleData,
dbForbindelse);

DataSet Datasæt = new DataSet();

DataAdapter.Fill(Datasæt, "oversigt");

DataTable dataTable = Datasæt.Tables[0];

foreach (DataRow dataRow in dataTable.Rows)

{

cdListe.Add(new Kamp(dataRow["nr"], dataRow["art"],
dataRow["model"], dataRow["årgang"]));

}

If i, instead of the last line, write:

listBox1.Items.Add(dataRow["nr"], dataRow["art"], dataRow["model"],
dataRow["årgang"]);

..everything add fine to the listBox.

But the other dosen't work, it say's, that it could not convert from
object to string, and .ToString doesn't help...

what do i do wrong...??

I use visual basic express 2005

(hope u can read my english)

Helge

Re: Add data to an ArrayList

Robert Rohde17-Dec-05 6:55

Robert Rohde

17-Dec-05 6:55

I would think it is the Kamp constructor.
I assume the constructor looks something like that:

public Kamp(string nr, string art, srting model, string argang){
//...
}

This means that if you call this constructor you need to pass 4 string parameters, but dataRow["xxx"] returns only an object.
If my constructor assumption is correct you'll need something like that:

cdListe.Add(new Kamp(Convert.ToString(dataRow["nr"]), 
                     Convert.ToString(dataRow["art"]), 
                     Convert.ToString(dataRow["model"]), 
                     Convert.ToString(dataRow["årgang"])));

Duif wrote:
I use visual basic express 2005

No you are obviously using Visual C# Express...

Re: Add data to an ArrayList

Duif17-Dec-05 7:03

Duif

17-Dec-05 7:03

Hi Robert, thank you for the fast reply...,

i will try it immediately...

And of course you are rigth, i use visual studio C# express...

Helge

Re: Add data to an ArrayList

Duif17-Dec-05 7:59

Duif

17-Dec-05 7:59

Hi Robert, it worked...., i'm happy... Smile | :)

Thank you..., have a nice week-end...

Helge

Re: Add data to an ArrayList

Duif17-Dec-05 9:36

Duif

17-Dec-05 9:36

Hi again Robert, can you also tell me, how i get the data from the ArrayList added to a DataGridView....???

I thought, that i could do it in the DataGridView properties, datasource...

Helge

Re: Add data to an ArrayList

Robert Rohde17-Dec-05 21:06

Robert Rohde

17-Dec-05 21:06

Depends a little bit on how you bound your data but here are two alternatives:

//1. Access values by row and column number and cast
string nr = (string)_entriesGridView[2, 3].Value;

//2. access via the DataSource property
//get the arraylist
ArrayList list = (ArrayList)_entriesGridView.DataSource;
//get entry
Kamp kamp = (Kamp)list[2];
//and value
string nr = Kamp.Nr;

ListView question

QzRz17-Dec-05 5:33

QzRz

17-Dec-05 5:33

Hi
I have created a ListView, with View put to Details.
Added a few items, and gave them some subItems.
Then I changed the background colour on all the
items and subItems.

Then when I click on one item it the background on the
first subitem gets gray, and the other subitems get
a white background.

Is it possible to make all the subitems the same colour,
when the item is selected?

Thanks
QzRz

Re: ListView question

cmaissan17-Dec-05 8:43

cmaissan

17-Dec-05 8:43

In the properties for the ListView control you will see a property named "FullRowSelect". Set this property to true.

-Chris

Re: ListView question

QzRz17-Dec-05 9:22

QzRz

17-Dec-05 9:22

It works now Smile | :)

Thanks!

Print the contents of an entire form

rikkemus17-Dec-05 5:12

rikkemus

17-Dec-05 5:12

Is it possible to print your entire form, with pictureboxes etc.

I know you can use ControlPaint.Button etc to print my controls, but what if i had an entire form(not mainmenu and the things above) i wished to output to my printer?

Re: Print the contents of an entire form

Robert Rohde17-Dec-05 5:50

Robert Rohde

17-Dec-05 5:50

Have you tried searching for print form[^]?

Re: Print the contents of an entire form

rikkemus17-Dec-05 9:20

rikkemus

17-Dec-05 9:20

Yes but those examples doesnt really do what i want, it has shortcomings when it comes to pictureboxes etc.

In old vb6.0 you could print an entire form, with PrintForm. MSDN makes an example where they Screenshot the memory for the drawed form(since printform isnt in .net), but if some part of the form is outside the screen, it cant dump that.

To me it sound logically, that you should be able to extract the drawed form somehow, even though it isnt on screen. Perhaps build a shadow of it in memory? and then memcpy that to the printerdocument.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.