Re: Barcode scanning - C# Discussion Boards

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Re: Registry/System updating.......??

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..

Re: Registry/System updating.......??

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

Re: Registry/System updating.......??

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.

Re: Barcode scanning

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.

Re: Barcode scanning

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.

Re: Barcode scanning

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!)

Re: Barcode scanning

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.

Check out the CodeProject forum Guidelines[^]

Re: Barcode scanning

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

Re: Barcode scanning

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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convert C struct into C#.net

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;

Re: convert C struct into C#.net

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)

Re: convert C struct into C#.net

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.

Re: convert C struct into C#.net

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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Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

Re: convert C struct into C#.net

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.

Re: convert C struct into C#.net

eyeshield213-Jun-09 18:40

eyeshield21

3-Jun-09 18:40

thanks alot all...

How to convert a string to double with out lossing precission??

prathapcode3-Jun-09 1:23

prathapcode

3-Jun-09 1:23

Hi,

I have a string with value "111733394601234567094987654321" . Now i want to divide this with 636. I convert it to double , then im getting 1.1173339460123456E+29 . but these both values are differnt finally im
getting wrong output. can anyone help me.....

Thanks
Prathap

Re: How to convert a string to double with out lossing precission??

Moreno Airoldi3-Jun-09 1:29

Moreno Airoldi

3-Jun-09 1:29

There is no way you can do that with doubles. Since the value is too big even for a 64 bit integer, you should use some 128-bit integer class. See for example this[^] or Google for some more.

2+2=5 for very large amounts of 2
(always loved that one hehe!)

Re: How to convert a string to double with out lossing precission??

Luc Pattyn3-Jun-09 3:45

Luc Pattyn

3-Jun-09 3:45

The latest .NET 4.0 (and Visual Studio 2010) is in beta and offers a BitInteger class which would easily take care of your big integer division, yielding accurate quotient and remainder values.

There also have been some articles on home-brew BigInteger classes here on CP (with varying functionality and quality).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

& missing

benjamin yap3-Jun-09 1:12

benjamin yap

3-Jun-09 1:12

Hi, my database has a column called 'course'. I have a value "Game & Entertainment Technology"

when i extract the value using

acc.Course = reader.GetValue(4).ToString();<br />
lblCourse.Text += " " + acc.Course.ToString();

the value becomes Game Entertainment Technology.. the & disappear

Re: & missing

Rob Philpott3-Jun-09 1:21

Rob Philpott

3-Jun-09 1:21

That's because & is used to underline a letter for a shortcut. You need to double it to &&.

acc.Course = reader.GetValue(4).ToString();
lblCourse.Text += " " + acc.Course.ToString().Replace("&", "&&");

Regards,
Rob Philpott.

Re: & missing

Rob Philpott3-Jun-09 1:24

Rob Philpott

3-Jun-09 1:24

Actually, presuming reader is a SqlDataReader and acc.Course is a string you can shorten this to:

acc.Course = reader.GetString(4);
lblCourse.Text += " " + acc.Course.Replace("&", "&&");

Regards,
Rob Philpott.

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