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sir thank u very much for ur help and guidance but there is one problem ... i dont want to use Graphics.DrawImage or any such coz my idea is to chnage the image in the PictureBox and rotate it actually
can u plz help as i read all ur 6 articles on image processing and they really helped especially tht all of them have unsafe code in them. kindly sir guide me in rotating an image to any degree in a picBox using unsafe code
Ahmad Zafar
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 u'r welcome.
the "quick and dirty" way is to use DrawImage and rotate the graphics, and then copy those graphics to a new bitmap. i think you will have to use unmanaged gdi for this (creating Device Context etc.) Otherwise u need to do the dirty work yourself
ahmadzafar wrote:
i read all ur 6 articles
I think u'r confusing me with the guy who replied above me. He has great articles, I have none.
by the way, unsafe code is used here, i think, for performance (speed), when u'r accessing each pixel's content.
there are no facts, only interpretations
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sir how r u ... one more thing i wanted to know ... u have any idea how to compress an image size?
Ahmad Zafar
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Does anyone know how this can be done? I'm currently using System.IO.Path.GetTempFileName( ) which returns a filename in the short format but I would prefer it to be in the long format. So any ideas?
Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!
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Unfortunately there is no built-in managed way to get this result.
You'll have to use P/invoke to call GetLongFileName().
mav
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I have a main worker thread that spawns a child thread to do some listening. What I'd like to happen is to have the child thread raise an event in the parent, but it seems it can only raise events in it's own thread.
Is there any way to have one thread raise events in another thread? Is this even possible?
Thanks
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Yes
http://www.codeproject.com/csharp/H5CsThreading.asp
and many other articles. "C# thread" in the search above will find them.
Gary
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I want to write an APP for window media player to play a video.
What should i do?
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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.
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]
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^---- 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.
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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.
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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
[My Articles] [My Blog]
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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
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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
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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).
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]
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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
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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...
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.
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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
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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.
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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
[My Articles] [My Blog]
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Hi, thanks for your help. Im new at this so a bit confused, and no I cant spell  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
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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.
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.
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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?
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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]
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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)}
?
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