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Try reading the first few bytes of the file, and see if it matches up with the extension of the file.
MP3's for example, will probably start with their ID3 tag, so the first three bytes would be:
I D 3
49 44 43
WMA start with their tag, which seems to start with:
0 & ²
30 26 B2
So, you could gather a small database of the headers of the filetypes. And compare the first few bytes of the uploaded file, to the set of bytes you already have.
If you get a file with extension: mp3 and it starts with something other than 49 44 43, you can just say that the extension does not match the filetype. Though you'd have to investigate this further. Im not sure what an mp3 starts with if it has no tag (can you get an mp3 without an ID3 tag?)
My current favourite word is: PIE!
Good ol' pie, it's been a while.
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Well ...an hour passed and I already have another question.
I have the data from a database in a data grid, except the id.
I want to know how can i take the id into a variable if a know the other fields of the row.
To understand exactly:
first column is the name, second column is the job;
I have the name and the job and i wanna find the ID and put it in a variable.
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why don't you load the ID at the same time you are loading other fields and keep it either in datakeynames or in a hidden column of the datagrid
-----
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Hi,
I try to pass two strings from a form to another.
in the first form the strings are stored in a data grid.
I've already retrieved the values fro the grid and i have 2 strings value1 and value 2.
how can i pass them from form 1 to form 2 and store them in two different text boxes in form 2?
Thanks!
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Steauaclau,
There are several ways to do it...
1. Create public static string firstString and reference it by the class name.
public class Form1 : Form
{
public static string firstString
....
}
public class Form2 : Form
{
Form2_OnLoad()
{
tbxStringValue.Text = Form1.firstString;
}
....
}
2. If one form calls the other, it could use a constructor to pass the value in.
Hope this helps.
Hogan
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snorkie wrote: public class Form1 : Form
{
public static string firstString
....
}
Why is the field public. This is not a valid time to make a field on a class public. It breaks the rules of encapsulation (one of the tenets of Object Orientation)
For more information about why making fields public is a bad idea please read:
* Why make fields in a class private, why not make them public?[^]
*The public fields debate again[^]
Also, you make it static. Why? What purpose does that serve? You have some data in controls which reside in instance fields and then you want to transfer it to a static field!  Why?
Upcoming FREE developer events:
* Developer! Developer! Developer! 6
* Developer Day Scotland
My website
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I agree with you that it isn't the best approach, and I will read the articles, but I wanted to give a quick and dirty answer to the issue at hand. Probably a bad idea to suggest quick and dirty...
Thanks for the info!
Hogan
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Thanks a lot!! I've maid it )
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You are welcome
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My problem started off with a simple directory copy. I needed to copy the directory to another location. After creating the directory, I used the following code to set up permissions correctly. That worked great! It seemed too easy...
DirectoryInfo dirSource = new DirectoryInfo(sourceDirectory);
DirectoryInfo dirDest = new DirectoryInfo(destinationDirectory);
dirDest.SetAccessControl(dirSource.GetAccessControl());
Now I find out that my destination is a named pipe. This breaks the .NET framework implementation. So I started down the path of using the API. I found the Kernel32 CreateDirectory command to create a directory over named pipes. The documentation there isn't great. (I would like to update it with more information when I'm done.)
[DllImport("kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CreateDirectory(string lpPathName, IntPtr lpSecurityAttributes);
I can't seem to find a way to get an IntPtr to the security attributes of the current directory from the .NET framework. Is there a simple way to do this that I'm missing? The .GetAccessControl() method of a DirectoryInfo object doesn't return anything like an IntPtr.
Any ideas/help/suggestions on how to use the API call to create the directory and apply the source directory's Acccess Control items would be awesome.
Thanks!
Hogan
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<iframe id="simpleEditor" runat="server"> </iframe> <br />
<br />
On Page_Load event how can i set the default value of iframe. Do i need to call a javascript function to the set the value if so how can i call a javascript from the .cs file or code behind file.<br />
<br />
Thanks
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look the answer in asp.net forum
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Hi All,
I have a group of radio buttons, and I am trying to determine which is checked. I access the Group Box container, but I can't find the collection for accessing the radio buttons. I want to do something similar to:
RadioButton b = (RadioButton)groupBox.Selected();
string s = b.Text; As always, any help would be appreciated.
Thanks,
Jeff
The following does not compile with the error, "error CS1579: foreach statement cannot operate on variables of type 'System.Windows.Forms.GroupBox' because 'System.Windows.Forms.GroupBox' does not contain a public definition for 'GetEnumerator'":
foreach (RadioButton b in grpDestination)
{
if (b.Checked)
{
...
}
}
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Try something like this:
foreach (Control control in grpDestination.Controls)
{
RadioButton radio = control as RadioButton;
if (radio != null && radio.Checked)
{
...
}
}
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That was it. Why are you using the following instead of a vanilla cast:
RadioButton radio = control as RadioButton Thanks,
Jeff
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Some prefer it that way. I usually use is, but it depends on what you're doing with it, generally (in my opinion) if you find yourself having to cast the same thing multiple times, use as or otherwise perform the cast once, save the value, and use that value.
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 Hi Jeff,
protected void btSelect_Click(object sender, EventArgs e)
{
foreach (Control ctl in this.form1.Controls )
{
if (ctl is RadioButton)
{
RadioButton rb1 = (RadioButton)ctl;
if (rb1.Checked == true)
{
lblTest.Text = rb1.Text;
}
}
}
}
Hope will helps
Better to use RadioButton List........
Thanks
"Good Thing Goes With Good People..."
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Hi,
I have .net(2003) soultion file which contains almost 120 Projects(dlls) including commonlib project (which contains common data to rest of projects).
All the projects will have the Project reference to commonlib project.
Whenever i add new project to the solution and rebuild the whole soultion, The finally added project gives out the commonlib dependency error.
When i remove the CommonLib project reference and Again give it back, rebuild it to the finally added project, it is rebuilding fine.
Can you help me out to find, why this is happened?
or any solution to solve this issue?
Thanks
Srini
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I had a similar issue on my references to other projects in my solutions... I used to click on add Reference and use the Browse tab to go to the physical file and make my reference that way.
A better way is to click on add Reference and go to the projects tab. Select the project that you want to reference/depend on. This will make sure that it is built before the new one and references it correctly.
If this isn't what you are doing, then I'm not sure.
Hope this helps!
Hogan
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Hi hogan,
i already made all the references as Project refernce instead dll reference, still im facing this issue.
Thanks
Srini
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I have an application that loads a dataset into a drop down menu in a DataGridView. Separately you can add or remove information from the SQL server that the dataset is populated from.
How do I update the dataset once the program is already running? (Assuming I have added information to the SQL table)
I have played around, and it seems that the dataset may be complied when the app starts, I could be wrong.
Any thoughts are appreciated,
Adam
--Its not broken if it never worked.
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There must be some code that initially loads the dataset. You should figure out where that is. Once you have, you can call this code from somewhere else in your application to reload it.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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Yeah.... The DataGridView allows you to select the dataset in the "properties" window, and doesn't allow you access to the code behind it.. at least that I can find.
I've tried all the datagridview.load .update and dataset.load .update combinations that I can think of, but none seem to have an effect. The program doesn't lock up, it just doesn't update the dataset.
--Its not broken if it never worked.
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In this <a href="http://www.codeproject.com/dotnet/DynamicCompileAndRun.asp" rel="nofollow">Article</a>, an example program will compile and run C# code at run-time. My question is: Is it possible to create an EXE from the code at run-time?
My objective is to make a scripting engine that converts a script to C# code and compiles it to an exe.
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