C# Discussion Boards - CodeProject

Re: Window Media Player Control

12-Oct-04 7:25

Customize your toolbox by right-clicking your toolbox in Visual Studio .NET and selecting "Customize..." (or equivalent). Find the Windows Media Player under the COM tab and add it to the list. Click OK.

Now just drag and drop it on your Windows Forms designer and fill-in the properties. If you need help with properties and methods exposed by the Windows Media Player control, read the SDK[^].

Note that this will create two additional assemblies that must be deployed with your application and Windows Media Player (whichever version you host in your Windows Forms application) must still be present on the user's system (most often, a newer version will work as well though you should always test against newer versions). The interop assemblies that are created automatically are only to expose COM components to .NET - they do not implement the functionality they encapsulate.

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Matt Philmon12-Oct-04 18:20

Matt Philmon

12-Oct-04 18:20

^---- That's an option but I think you'll find that WMP is hugely bloated. It really isn't great for development. I recommend strongly (having done this myself) that you take a close look at wrapping MCI calls directly. It's not difficult and gives you the best control you'll find without the massive bloat.

File Streaming

RockRock12-Oct-04 6:42

RockRock

12-Oct-04 6:42

I want to send a partition of video file and some data files(text and images) from one terminal to another terminal. After sending, the video should be playable.
Therefore, I have to write a program that perform streaming.
1.-RTSP / RTP, which is better?
2.-Shall i choose to use WMV, ASF or AVI file?
3.-Any other methods are welcome.
Please help me.

Re: File Streaming

Heath Stewart12-Oct-04 7:29

Resizing Individual Tabs on a TabControl

12-Oct-04 7:29

None of those formats or protocols are for sending data files - only video (and in some cases audio).

In any case, this is not the correct forum for these kinds of questions; it is for C#-related questions not addressed by another forum, like the ASP.NET forum.

You might ask in the Lounge, but do not post programming questions there; they will not be tolerated (and it says so in big, bold, red letters).

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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Re: File Streaming

yoaz13-Oct-04 7:19

yoaz

13-Oct-04 7:19

I'm not sure I understand your question:
RockRock wrote:
I want to send a partition of video file and some data files

Why not send them through e.g., tcp?

RockRock wrote:
After sending, the video should be playable

if its after the files have arrived, they are presumably playable.
But if you want the video files to be played "live" from the server, then I think u'r trying to write a browser which is a media player + a server. This is difficult and there's even some free stuff around.
To the point: RTP i know little of. RTSP is used by Real, and is built a bit upon HTTP. I don't think it's very helpful if u'r writing u'r own client and server, but see the RFC.

there are no facts, only interpretations

dbromberg12-Oct-04 6:06

dbromberg

12-Oct-04 6:06

Hi,
I have a CustomTabControl that inherits from TabControl. One of the things it does is it bolds the text in the currently selected tab- it just draws the text itself- I have it set to ownerdraw. The problem is that the default size for each tab is to size itself based on the original font and string (before I bold it). This creates very narrow-looking tabs when something is bolded. I'd like a way to either have the tab re-assess how wide it needs to be based on the font change or to manually widen an individual tab myself. I took a look at the ItemSize property of TabControl but that didn't help me any- it doesn't even appear to do anything when I make it wider, plus it's sort of a universal size, not one for an individual tab.

-David

Re: Resizing Individual Tabs on a TabControl

Heath Stewart12-Oct-04 11:12

Update Command - Please Help

12-Oct-04 11:12

You can P/Invoke SendMessage and send TCM_SETPADDING (0x132b) to increase the tab a little, or there's other messages documented in the Windows Common Controls (since almost every Windows Forms control encapsulates the Common Controls).

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Microsoft

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amdacc12-Oct-04 3:16

amdacc

12-Oct-04 3:16

Please Help.

I have a very small inventory database, where i call up details of an item in stock that i want to book out. All i need to do to book it out is add a Serial number, store and IP number. I can call up the record, but i can update it. When i look at Quick watch, the program has the new information, but i cant send it back to the database. Im using SQL 2000 and C# 2003. It compiles all ok, but it breaks when it is run. Any help would really be appreciated. Thanks

My Code is as follows:

private void btnBkOutSave_Click(object sender, System.EventArgs e)
{

SqlCommand DAUpdateCommand;

string sType = "";
string sBkInMake="";
string sBkInModel= "";
string sBkInSN= "";
string sIPAddress ="";
string sStore = "";
string sUssage = "";

string myConnectString = "Data Source=devserver2;Persist Security Info=False;Initial Catalog=storeInventory;User ID=sa;password=;";
SqlConnection myConnection = new SqlConnection(myConnectString);
myConnection.Open();

sType= txtBkInType.Text;
sBkInMake= txtBkInMake.Text;
sBkInModel= txtBkInModel.Text;
sBkInSN= txtBkInSN.Text;
sIPAddress =txtBkOutIP.Text;
sStore = cboBkOutStoreNo.Text;
sUssage = txtBkOutUssage.Text;

MyData.Tables[0].Rows[0]["IpAddress"] = sIPAddress;
MyData.Tables[0].Rows[0]["Store"] = sStore;
MyData.Tables[0].Rows[0]["Ussage"] = sUssage;

da = new SqlDataAdapter("Select * From Items", myConnectString);

DAUpdateCommand = new SqlCommand("UPDATE Items set IPAddress = '" + sIPAddress + "',Store = " + sStore + "',Ussage = " + sUssage + "' where id=" + MyData.Tables[0].Rows[0]["id"] + ")", myConnection);

DAUpdateCommand.Parameters.Add(new SqlParameter("@Store", SqlDbType.Int, 4));
DAUpdateCommand.Parameters["@Store"].SourceVersion= DataRowVersion.Original;
DAUpdateCommand.Parameters["@Store"].SourceColumn = sStore;

DAUpdateCommand.Parameters.Add(new SqlParameter("@IpAddress", SqlDbType.NVarChar,50));
DAUpdateCommand.Parameters["@IPAddress"].SourceVersion= DataRowVersion.Original;
DAUpdateCommand.Parameters["@IPAddress"].SourceColumn = sIPAddress;

DAUpdateCommand.Parameters.Add(new SqlParameter("@Ussage", SqlDbType.Text,16));
DAUpdateCommand.Parameters["@Ussage"].SourceVersion= DataRowVersion.Original;
DAUpdateCommand.Parameters["@Ussage"].SourceColumn = sUssage;

da.UpdateCommand = DAUpdateCommand;
da.Fill(MyData,"Items");
da.Update(MyData,"Items");

myConnection.Close();
MessageBox.Show("Saved");
Clear();
}

Thanks again

Angela

Do you want to know more?

Colin Angus Mackay12-Oct-04 3:43

Colin Angus Mackay

12-Oct-04 3:43

Angela Dick wrote:
User ID=sa;password=;";

Please tell me that you deleted the password for security and are not actually running your SQL Server's sa account without at least the protection of a password. You know that dialog when you installed SQL Server and it asked for an initial password for the sa account it had a checkbox for a blank password with the words "not recommended" next to it, it really really isn't recommended.

Your code seems to be incredibly confused. You seem to have meshed a variety of different techniques together. For instance, you are adding parameters to your update command, but the SQL itself takes no parameters as you are directly injecting the values from your controls into the database which leaves you open to a SQL Injection Attack[^]. Finally, you are filling your dataset, overwriting the values you diligently inserted into the table at the top of your method, then you call update.

Angela Dick wrote:
It compiles all ok, but it breaks when it is run.

So, how does it actually break? Is an exception thrown? Does the information not get updated? or...

Vogon Building and Loan advise that your planet is at risk if you do not keep up repayments on any mortgage secured upon it. Please remember that the force of gravity can go up as well as down.

amdacc12-Oct-04 9:22

amdacc

12-Oct-04 9:22

hi, Thanks for getting back to me. Dont wory about the password, its only set up like that for beginners like me to play. Its not used for anything important.

I have been looking at code from all over the internet, and since i started this, non of the examples i have used have helped. Thats why its mis-matched. i have now managed to blag some help here and i have this

SqlCommand cmd;
string sType = "";
string sBkInMake="";
string sBkInModel= "";
string sBkInSN= "";
string sIPAddress ="";
string sStore = "";
string sUssage = "";

string myConnectString = "Data Source=devserver2;Persist Security Info=False;Initial Catalog=storeInventory;User ID=sa;password=;";
SqlConnection myConnection = new SqlConnection(myConnectString);

if (txtBkInSN.Text.Length != 0)
{
myConnection.Open();

sType= txtBkInType.Text;
sBkInMake= txtBkInMake.Text;
sBkInModel= txtBkInModel.Text;
sBkInSN= txtBkInSN.Text;
sIPAddress =txtBkOutIP.Text;
sStore = cboBkOutStoreNo.Text;
sUssage = txtBkOutUssage.Text;

MyData.Tables[0].Rows[0]["IpAddress"] = sIPAddress;
MyData.Tables[0].Rows[0]["Store"] = sStore;
MyData.Tables[0].Rows[0]["Ussage"] = sUssage;

cmd = new SqlCommand("UPDATE Items " +
"set IPAddress = " + sIPAddress + " ,Store = " + sStore + " ,Ussage = " + "'" + sUssage + "' where SerialNo = '" + txtBkInSN.Text.Trim() + "'", myConnection);

da.UpdateCommand = cmd;
da.Fill(MyData,"Items");
da.Update(MyData,"Items");

myConnection.Close();
MessageBox.Show("Saved");
Clear();
}
else
MessageBox.Show("Please Find a Serial Number and complete relevant infromation before pressing save.");

I dont know if it is the best way to do it, but........ it seems to be working ok.

Thanks Again

Angela

Colin Angus Mackay12-Oct-04 11:02

Colin Angus Mackay

12-Oct-04 11:02

In addition to what Heath has said, there is still redundant code here.

I would get rid of the DataSet altogether, unless you need it for something else later, and if you do then I'd still clean up a lot of this code.

First, they way you are performing the update does not require a SqlDataAdapter. So instead of setting the UpdateCommand to the SqlCommand you just created, why not just use SqlCommand.ExecuteNonQuery()

So,
da.UpdateCommand = cmd;
da.Fill(MyData,"Items");
da.Update(MyData,"Items");

is replaced with

cmd.ExecuteNonQuery();

If you do not required the dataset for anything else then I would zap the following lines also:
MyData.Tables[0].Rows[0]["IpAddress"] = sIPAddress;
MyData.Tables[0].Rows[0]["Store"] = sStore;
MyData.Tables[0].Rows[0]["Ussage"] = sUssage;

Do you want to know more?

Vogon Building and Loan advise that your planet is at risk if you do not keep up repayments on any mortgage secured upon it. Please remember that the force of gravity can go up as well as down.

Heath Stewart12-Oct-04 7:36

12-Oct-04 7:36

It's good that you're trying to used parameterized queries since SQL string concatenation leaves you wide open for SQL injection attacks - which are especially bad in your case since your executing commands as the 'sa' - NEVER do this; always use least required privileges, especially when invoked from the most dangerous place on the planet: the Internet.

But you're not using parameters correctly. You should read the documentation for the SqlCommand.Parameters property in the .NET Framework SDK so you know what you're doing. Your SQL expression should actually look like this (based on your parameter names you're using):

DAUpdateCommand = new SqlCommand(@"
  UPDATE Items SET IPAddress = @IPAddress, Store = @Store, Ussage = @Ussage
  WHERE id = @ID");

BTW, it's "usage" with one "s", not "ussage".

Additionally, you'll need to add @ID to your parameters list. Always use parameterized queries everywhere possible.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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amdacc12-Oct-04 9:27

amdacc

12-Oct-04 9:27

Hi, thanks for your help. Im new at this so a bit confused, and no I cant spell Smile | :)

Never mind.

I have managed to get it working, with some help.. i have put the code in my last reply, it isnt using the parameters as the girl helping me couldnt work it out either. Dont know if its the best way to do things.....

Thanks again

Angela

Do you want to know more?

Colin Angus Mackay12-Oct-04 10:47

Colin Angus Mackay

12-Oct-04 10:47

Angela Dick wrote:
no I cant spell Never mind

Actually, it might sound daft but it is kind of important when you are working in a team environment - because if one member of the team creates code that is has spelling mistakes through it then others will either have to clean it up, or the mistake propagates causing confusion constantly between whether to use the correct spelling or not. I have to admit that I am not a saint in the spelling department, but I do my best and ensure that errors in spelling, which the compiler doesn't care about if you're consistent about it, are corrected as soon as possible.

Angela Dick wrote:
it isnt using the parameters as the girl helping me couldnt work it out either. Dont know if its the best way to do things.....

It isn't. You should always use parameters if you need to send in variable information rather than concatenate strings together. If you clicked the link[^] I gave you before there is some sample code showing a before and after senario with concatenation changing to a parameterised query. That might help you understand how to make a perametarised query.

Vogon Building and Loan advise that your planet is at risk if you do not keep up repayments on any mortgage secured upon it. Please remember that the force of gravity can go up as well as down.

2Scoops13-Oct-04 22:57

2Scoops

13-Oct-04 22:57

All I can say is that I would hate to be a developer with no experience asking you for help. I used to frequent this web site quite alot as the help was always useful and straight to the point. These days though, the site has definately lost it's edge.

If Angela was looking for preventative measures again SQL injection attacks, then she would ask for them. Angela's question was obviously from a beginner, and for you to start mentioning preferred security measures was totally pointless.

If your aim was to be patronising and demorallising then you have succedded. But on the other hand, if your aim was to help an in-expreienced developer then you have failed miserably.

I myself make frequent spelling mistakes, even when emailing my client's I make mistakes. They don't point them out because they know at the end of the day I probably spent more productive time delivering a system free of bugs, rather than spending time spell checking every line of code I write.

BTW, have I spelt everything right Colin?

Heath Stewart12-Oct-04 10:56

Re: Crystal Reports Formulas

12-Oct-04 10:56

As Colin said, under no circumstances should you ever use string concatenation. Read the .NET Framework SDK documentation that got installed with Visual Studio or the .NET Framework SDK, or that's available on http://msdn.microsoft.com/library[^]. It's important to write correct code, not just write whatever you can get to compile. SQL injection attacks are a very serious and easily exploitable threat, and since your compiled C# source is in Intermediate Language (not machine code) it's very easy to read. The .NET Framework SDK itself even includes a disassembler named ildasm.exe and for those of us that can read IL (or those that cop-out and use decompilers like the famous .NET Reflector) it would be easy to compromise your code.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles] [My Blog]

Crystal Reports Formulas

NormDroid12-Oct-04 1:38

NormDroid

12-Oct-04 1:38

This there any way to access data from a command dynamically in a formula:

eg
formula = {Command.SalesFiguresP1}

(was the 1 is dynmic}

eg.

formunal = {"Command.SalesFiguresP" + ToText(var)}

?

Heath Stewart12-Oct-04 7:19

Re: Crystal Reports Formulas

12-Oct-04 7:19

This forum is for questions related to C# that are not specifically addressed by other forums on CodeProject (like ASP.NET questions - even though written in C# - should be asked in the ASP.NET forum). This is not a forum for Crystal Reports.

If you need help with Crystal Reports, I suggest you use their forums: http://support.businessobjects.com/forums/default.asp?ref=default.asp_wwwjump[^].

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles] [My Blog]

NormDroid12-Oct-04 20:36

NormDroid

12-Oct-04 20:36

Thanks you been most helpful, BTW: is "Developer Division Sustained Engineering" just a fancy name for the bug fixes team Poke tongue | ;-P

Select Statement

pat27088112-Oct-04 1:26

pat270881

12-Oct-04 1:26

hello,

my method for retrieving data from the sql server ce database and display it in a data grid looks as follows:

dataSet = new DataSet("Jobs");

daptJobs = new SqlCeDataAdapter("Select Priority, Problem, EmailClient From JobDescription Order By Priority", strConn);
daptJobs.Fill(dataSet,"Jobs");
DataTable dtabJobs = dataSet.Tables["Jobs"];
dgridDisplay.DataSource = dtabJobs;

But i want to modify the Select Statement that Priority, Problem and EmailClient is only selected when UserEngineerId - field has a special value and the StartDate field is equal or after the Today Date.

The thing with the UserEngineerId works when i quote directly the value in the Select Statement but I want to quote a variable with the certain value..? And the thing with the Date is not really clear for me.

thx

patrick

Stanciu Vlad12-Oct-04 2:24

Stanciu Vlad

12-Oct-04 2:24

try the following

<br />
string selectString = <br />
   " Select " +<br />
   "    Priority, Problem, EmailClient " +<br />
   " From JobDescription " +<br />
   " Where UserEngenieerId = " + yourValueVariable + <br />
   "       And StartDate >= " + DateTime.Now.Date + <br />
   " Order By Priority ";<br />
<br />
daptJobs = new SqlCeDataAdapter(selectString);<br />
....<br />

and if the code is not acurate (mening that the date si not precise) onvert it with the sql convert function (you can find it in the sql bible or manual Wink | ;)

)

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

Heath Stewart12-Oct-04 7:13

12-Oct-04 7:13

NEVER use string concatenation to build SQL queries. ADO.NET supports parameterized queries and you should use them. What you're doing allows for easy SQL injection attacks.

Search previous comments for more reasons in the billions of times I've had to say this. Your code - and similar code you may write - is extremely insecure and does not follow good coding practices. Mike's reply right below yours mentions as much, too.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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Mike Dimmick12-Oct-04 2:47

Mike Dimmick

12-Oct-04 2:47

It's best to use parameterised queries, for example:

SqlCeCommand cmd = 
   new SqlCeCommand(
      "SELECT Priority, Problem, EmailClient " +
      "FROM JobDescription " +
      "WHERE UserEngineerId = ? AND StartDate >= ? " +
      "ORDER BY Priority" );
       
SqlCeParameter param1 = 
   new SqlCeParameter( "@userID", SqlDbType.Int );
param1.Value = userEngineerID;
cmd.Parameters.Add( param1 );
 
SqlCeParameter param2 =
   new SqlCeParameter( "@date", SqlDbType.DateTime );
param2.Value = DateTime.Today;
cmd.Parameters.Add( param2 );
 
cmd.Connection = new SqlCeConnection( strConn );
 
daptJobs = new SqlCeDataAdapter( cmd );

The two parameters substitute for the ? in the query string, in the order they're added to the Parameters collection.

Stability. What an interesting concept. -- Chris Maunder