C# Discussion Boards - CodeProject

Dave Kreskowiak3-Jun-09 3:27

Dave Kreskowiak

3-Jun-09 3:27

You don't "reload the Registry". You have to notify or reload the component that uses those registry values to get it to see the changes, IF that component exposes such functionality. If not, you have no choice but to restart the system for those changes to take effect.

What changes are you making??

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Hum Dum3-Jun-09 19:56

Hum Dum

3-Jun-09 19:56

Dave Kreskowiak wrote:
What changes are you making??

I am deleting some registry entries used by an application.
But even if the entries got deleted the application keeps on running until it restarts.

So, Isn't there a way to do this thru coding?
(like when we install some application then upon complete installation, the whole explorer(all open windows) got refreshed, i think it reloading os/reg)

Dave Kreskowiak wrote:
You have to notify or reload the component that uses those registry values to get it to see the changes,

How can i notify an application to check or reload itself?

regards

Dave Kreskowiak4-Jun-09 1:20

Dave Kreskowiak

4-Jun-09 1:20

Hum Dum wrote:
So, Isn't there a way to do this thru coding?
(like when we install some application then upon complete installation, the whole explorer(all open windows) got

The O/S and/or Explorer and/or the registry does NOT get reloaded right before the users eyes.

Hum Dum wrote:
How can i notify an application to check or reload itself?

The notification method, if any, depends on what needs to be notified. For example, changing the background image is a broadcast message to Explorer sent using a specific API in Windows. But, this method ONLY works if the app (Explorer) is listening for it. It will NOT work with other applications.

Hum Dum wrote:
I am deleting some registry entries used by an application.
But even if the entries got deleted the application keeps on running until it restarts.

This is true. Most applications will not see any changes you make to their registry settings until the app is restarted. Most applications will, also, NOT expose any method to tell them that they need to reload their registry settings. Your best (read: most reliable) course of action is to stop the app and restart it.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

harold aptroot3-Jun-09 3:43

harold aptroot

3-Jun-09 3:43

If the changes are to a part that Explorer uses then just killing the Explorer process works as well, but please don't
Better inform the user that the changes will only apply after rebooting and letting him do it himself..

Hum Dum3-Jun-09 19:59

Hum Dum

3-Jun-09 19:59

harold aptroot wrote:
just killing the Explorer process

I tried to do this, but it only works in xp, vista OS.
On windows 2000 its not working, screen simply got blank if i kill the explorer Smile | :)

,

Any other help would be appreciated.
regards

harold aptroot3-Jun-09 23:42

harold aptroot

3-Jun-09 23:42

Ok well it's a very bad thing to do anyway.. Standard practice is to ask whether to reboot now or later.

AsyncCallback

yesu prakash3-Jun-09 2:03

yesu prakash

3-Jun-09 2:03

Hi,

In my application there is three ports listening, each have corresponding AsyncCallback method, ie 3 AsyncCallback method in the application. These three AsyncCallback methods are working as thread.These are ready to accept messages at any time.

How can i block or wait first and second AsyncCallback method while the third AsyncCallback methord is executing.

So after the execution of the third AsyncCallback method, next message in the queue is ready to execute, it can be in first , second or third AsyncCallback method.

Yhankyou
YPKI

Re: AsyncCallback

Not Active3-Jun-09 2:59

Not Active

3-Jun-09 2:59

Have you tried using WaitHandle.WaitAll[^]?

only two letters away from being an asset

Re: AsyncCallback

_Erik_3-Jun-09 5:25

_Erik_

3-Jun-09 5:25

Hi,

You can try a Mutex

Barcode scanning

KIDYA3-Jun-09 1:56

KIDYA

3-Jun-09 1:56

hello experts

I have scanner thr' which i am scanning barcode.I want to do coding for same.when device trigger clicked,textbox must show respective barcode no.
Give me any useful link or code for same.

J4amieC3-Jun-09 2:03

J4amieC

3-Jun-09 2:03

Barcode scanners generally come with an API, or mimic keyboard entry depending on the make/model. There is no way whatsoever for anyone to answer your question without knowing which type of scanner you are using.

KIDYA wrote:
Give me any useful link or code for same.

Even if you had worded that sentence politely (ie, with the addition of the word please) nobody is going to help you unless you help yourself.

KIDYA3-Jun-09 2:24

KIDYA

3-Jun-09 2:24

Then what is my work? i m new wid this.is there any operations want to do wid API? or it will installed automatically when set up of scanner install.

J4amieC3-Jun-09 2:59

J4amieC

3-Jun-09 2:59

That sentence makes no sense. "wid" is not a word in the English language (Although freakishly enough its my wife's pet name for her dad WTF | :WTF:

dont ask!)

EliottA3-Jun-09 3:35

EliottA

3-Jun-09 3:35

Apparently, wid is the new with. Just like his name is the new word for fail.

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Ennis Ray Lynch, Jr.3-Jun-09 2:04

Ennis Ray Lynch, Jr.

3-Jun-09 2:04

Set the focus to your text box and pull the trigger.

Need custom software developed? I do C# development and consulting all over the United States.

A man said to the universe:
"Sir I exist!"
"However," replied the universe,
"The fact has not created in me
A sense of obligation."
--Stephen Crane

convert C struct into C#.net

Luc Pattyn3-Jun-09 3:38

Luc Pattyn

3-Jun-09 3:38

Ennis Ray Lynch, Jr. wrote:
pull the trigger.

stick'em up

Smile | :)

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eyeshield213-Jun-09 1:38

eyeshield21

3-Jun-09 1:38

hi,

I want to ask how to convert this C struct into C#.net

typedef struct _MT_EVENT {
#if _WIN32
LARGE_INTEGER TimeStamp; // In FILETIME format
#elif LINUX
struct timeval TimeStamp; // In gettimeofday() format
#endif
ULONG UserStatus; // Not used by API
ULONG EventCode; // Event Code
ULONG SubReason; // Event sub-reason
ULONG XtraInfo; // Extra information, e.g. termination
ULONG FuncCode; // Function active when this event occurred
USHORT Board; // Board ID
USHORT Channel; // Global Channel ID (GCI)
PVOID ptrBuffer; // Related play/record buffer pointer
ULONG DataLength; // Byte length of data accessed (played/recorded)

PVOID ptrXtraBuffer; // Pointer to xtra buffer
ULONG XtraBufferLength; // Length of buffer pointed by ptrXtraBuffer
ULONG XtraDataLength; // Length of data in buffer pointed by ptrXtraBuffer
ULONG EventFlag; // Falgs of the following:
// bit 0x00000001: 1 - Appl created the event
// 0 - NTi DLL created the event
// bit 0x00000002: 1 - Appl allocated ptrtraBuffer
// 0 - NTi DLL allocated ptrXtraBuffer
} MT_EVENT, *PMT_EVENT;

Ennis Ray Lynch, Jr.3-Jun-09 2:42

Ennis Ray Lynch, Jr.

3-Jun-09 2:42

Check out the code MS provides for the Windows Mobile Gps, http://msdn.microsoft.com/en-us/library/ms881362.aspx[^] (Sample code comes with the SDK)

It contains many C structs written in C#, fairly cool. (Although, the sample like all MS samples doesn't work out of the box)

Rob Philpott3-Jun-09 2:53

Rob Philpott

3-Jun-09 2:53

I'm not so hot on all that interop stuff and its a guess, but you could try this:

[StructLayout(LayoutKind.Sequential)]
public struct _MT_EVENT
{
	public long TimeStamp;
	public ulong UserStatus; // Not used by API
	public ulong EventCode; // Event Code
	public ulong SubReason; // Event sub-reason
	public ulong XtraInfo; // Extra information, e.g. termination
	public ulong FuncCode; // Function active when this event occurred
	public ushort Board; // Board ID
	public ushort Channel; // Global Channel ID (GCI)
	public IntPtr ptrBuffer; // Related play/record buffer pointer
	public ulong DataLength; // Byte length of data accessed (played/recorded)
	public IntPtr ptrXtraBuffer; // Pointer to xtra buffer
	public ulong XtraBufferLength; // Length of buffer pointed by ptrXtraBuffer
	public ulong XtraDataLength; // Length of data in buffer pointed by ptrXtraBuffer
	public ulong EventFlag; // Falgs of the following:
}

Regards,
Rob Philpott.

Luc Pattyn3-Jun-09 3:41

Luc Pattyn

3-Jun-09 3:41

size warning: in.NET long/ulong are 64-bit integers, in most other languages when targettingt a 32-bit CPU they just take 32-bit.

http://www.pinvoke.net[^] holds lots of useful interop stuff, however it also contains some mistakes, frequently passing a pointer as int (should be IntPtr).

Smile | :)

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Ennis Ray Lynch, Jr.3-Jun-09 5:16

Ennis Ray Lynch, Jr.

3-Jun-09 5:16

That is the primary reason I encourage (require) programmers on my teams not to use int and long in C# and instead require Int32 and Int64. The same issue comes up a lot in database programming. I am absolutely sick and tired of seeing cast errors in code because a programmer doesn't know what type they are using.