C# Discussion Boards - CodeProject

Re: CalcBalance does not exist in the current context

Skanless10-Jul-06 16:37

10-Jul-06 16:37

Thanks, Guys I really apprecaite the tip. I changed the name and it worked. This code was written directly from a microsoft book, as is, so i took it for granted that i was doin something wrong................what a dork. Thanks again. I knew I can rely on you guys for assistance.

Greg

The Belizean Dan Dada!!!

Re: CalcBalance does not exist in the current context

J4amieC10-Jul-06 21:57

J4amieC

10-Jul-06 21:57

Which just goes to proove:

1) Technical writers/editors make mistakes too
2) Dont believe everything you read without verifying it

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Show the "video capture filter " form in c#

davilovick10-Jul-06 6:54

davilovick

10-Jul-06 6:54

Hi, i'm trying to show the "video capture filter" or "video source" form to configure the webcam parameters.
How can i do that??

Very thanks. Sorry, I'm Spanish.

www.studios-tortuga.com

Re: Show the "video capture filter " form in c#

LongRange.Shooter10-Jul-06 8:21

LongRange.Shooter

10-Jul-06 8:21

You probably should begin by reading Chris' article on how to get answers to your questions. It is really unclear as to what you are asking here! If you believe there is some kind of dialog in .NET to display this video source form, you are very wrong. You will have to write this yourself. If it is a feature within a webcam piece of hardware, then you need to look into the webcam SDK and determine how to interact with this in your program. Contacting the webcam manufacturer will help along these lines.

Re: Show the "video capture filter " form in c#

Malcolm Smart10-Jul-06 20:53

Malcolm Smart

10-Jul-06 20:53

It's ok to be Spanish. Don't apologise. Now, if you were Welsh....that's a different question.

Regards

Angel
*********************************************
The sooner you fall behind, the longer you have to catch up.

OdbcCommand not taking

HahnTech10-Jul-06 6:21

HahnTech

10-Jul-06 6:21

I’m having troubles with the following code:

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = _CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("_CustomerNumber", vfx.TNM);
dr = cmdSelect.ExecuteReader();

Throws SQLSRV32.DLL - ERROR [42S22] [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid column name '_CustomerNumber'

No kidding _CustomerNumber is an Invalid Column name. I’m trying to replace it with vfx.TNM. If I look at the Command object in the watch window Parameters.items[0].parametername = “_CustomerNumber” and Parameters.items[0].Value = “000122”

So why isn’t it getting to the db that way.

I’ve also tried

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = @CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("@CustomerNumber", vfx.TNM);
dr = cmdSelect.ExecuteReader();

Throws SQLSRV32.DLL - ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Must declare the variable '@CustomerNumber'

So to me it looks like the Command isn’t committing the changes of the parameters to the query. That made me try:

txtSelect.Text = “Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = @CustomerNumber”
OdbcCommand cmdSelect= new OdbcCommand(txtSelect.Text, conn);
cmdSelect.CommandType=CommandType.Text;
cmdSelect.Parameters.Add("@CustomerNumber", vfx.TNM);
cmdSelect.Prepare();
dr = cmdSelect.ExecuteReader();

And that didn’t work either.

Any help is appreciated, Thanks.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Not Active10-Jul-06 6:50

Not Active

10-Jul-06 6:50

First question would be why are you using OdbcCommand rather than SqlCommand? It appears you are connecting to a Sql Server database.

Re: OdbcCommand not taking

HahnTech10-Jul-06 10:16

HahnTech

10-Jul-06 10:16

Well some sites use MS SQL others use Postgrsql. When you write code that is flexible and not just MS you can't always take the easy way.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Not Active10-Jul-06 11:33

Not Active

10-Jul-06 11:33

True enough. You didn't mention anything about the databases you were using. From the evidence you provided it seemed only SQL Server.

You might want to look at the Microsoft Enterprise Library and the Data Application block to assist in writing a more generic data access layer.

Re: OdbcCommand not taking

HahnTech10-Jul-06 13:23

HahnTech

10-Jul-06 13:23

Thanks for the link. I need all the help i can get with this two DBS thing.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Colin Angus Mackay10-Jul-06 12:20

Colin Angus Mackay

10-Jul-06 12:20

HahnTech wrote:
Well some sites use MS SQL others use Postgrsql. When you write code that is flexible and not just MS you can't always take the easy way

Ummm.....

You are going to have to write different SQL queries anyway for each database because of the differences in the way SQL is implemented in each database. If you write a proper DAL (Data Access Layer) you can swap in and out the DAL depending on the datbase you are using. The rest of the application uses interface(s) to the DAL, so both have the same public methods. However, inside each of the DAL classes the datbase code is optimised for the appropriate database.

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Re: OdbcCommand not taking

Guffa10-Jul-06 7:06

Guffa

10-Jul-06 7:06

Parameters in ODBC don't have names. Use "?" in the query to identify the parameters, and add the parameters to the parameter collection in the same order as they appear in the query.

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b { font-weight: normal; }

Re: OdbcCommand not taking

HahnTech10-Jul-06 10:19

HahnTech

10-Jul-06 10:19

Cool Thanks for the help. I Guess I'm going to just to Replace() on the input string then. The attraction of using parameters was that it allowed a bit of latitude in how the sql strings where made.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

led mike10-Jul-06 10:39

led mike

10-Jul-06 10:39

HahnTech wrote:
I Guess I'm going to just to Replace() on the input string then.

Why? Just use '?'

Select System_id From [DFIParmsHTS].[docsadm].[ExtGroup] where CustNumber = ?

then

cmdSelect.Parameters.Add("", vfx.TNM);

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

Re: OdbcCommand not taking

HahnTech10-Jul-06 11:34

HahnTech

10-Jul-06 11:34

Yeah that would work Great if I was always only going to use one where clause or if this was the only sql statement in the program. But tomorrow or a week from now, myself or some one else will have to edit the sql to return a smaller range and forget that its ordinal specific then spend 2h trying to figure out why its not working. Replace() is ordinal unspecific and works all the time. I envy all you programmers that get to use a static DB schema.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

led mike10-Jul-06 12:08

led mike

10-Jul-06 12:08

Stored Procedures

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

Re: OdbcCommand not taking

HahnTech10-Jul-06 13:21

HahnTech

10-Jul-06 13:21

Too many sites to manage and a moving Db schema make them too hard to manage.

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: OdbcCommand not taking

Guffa10-Jul-06 12:26

Guffa

10-Jul-06 12:26

If you are not going to use parameters, be sure to encode the values properly when you put the query together, or your application will be wide open for SQL injections.

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b { font-weight: normal; }

SendMessage problem

psyonara10-Jul-06 5:52

psyonara

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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ravib(at)ravib(dot)com

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
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

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