Detect file type

[Alan T]

Is there a way to determine what type of file it is?
eg.
MyDoc.doc returns Word
MyDoc.xls or MyDoc.csv returns Excel
MyDoc.ppt returns PowerPoint
.... etc

 

[puja]

if u r suing .net 2.0 version then u can check ur file upload extension by
using

string extension = Path.GetExtension(FileInput.PostedFile.FileName);

switch(extension.tolower())
{
case ".doc": // do something

case ".jpg": // do something

................
}

 

[Mihai N.]

if u r suing .net 2.0 version then u can check ur file upload extension by

using

string extension = Path.GetExtension(FileInput.PostedFile.FileName);

switch(extension.tolower())
{
case ".doc": // do something

case ".jpg": // do something

...............
}

..jpg has various applications associated with it, depending on the system.
You cannot hard-code it in the sources.


I am not sure if there is an API for this, but the info is in regitry, in
HKEY_CLASSES_ROOT.
Take .rtf for instance and go to HKEY_CLASSES_ROOT\.rtf:
=====================
[HKEY_CLASSES_ROOT\.rtf]
@="Word.RTF.8"
"Content Type"="application/msword"

[HKEY_CLASSES_ROOT\.rtf\OpenWithList\WordPad.exe]
@=""

[HKEY_CLASSES_ROOT\.rtf\PersistentHandler]
@="{5e941d80-bf96-11cd-b579-08002b30bfeb}"

[HKEY_CLASSES_ROOT\.rtf\ShellNew]
"Data"="{\\rtf1}"
=====================
Then you go to Word.RTF.8 and see the various shell commands:
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Edit
HKEY_CLASSES_ROOT\Word.RTF.8\shell\New
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Open
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Print
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Printto
=====================

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

What you want to do this this?

In the registry you can find the program registerd to handle a given
extension.

 

[Claes Bergefall]

You can P/Invoke SHGetFileInfo to get this info if you don't feel like
reading the registry directly. You'll most likely be able to find all the
necessary stuff in one of these posts:
http://groups.google.com/groups/search?q=SHGetFileInfo+group:*dotnet*


/claes

if u r suing .net 2.0 version then u can check ur file upload extension
by
using

string extension = Path.GetExtension(FileInput.PostedFile.FileName);

switch(extension.tolower())
{
case ".doc": // do something

case ".jpg": // do something

...............
}

.jpg has various applications associated with it, depending on the system.
You cannot hard-code it in the sources.


I am not sure if there is an API for this, but the info is in regitry, in
HKEY_CLASSES_ROOT.
Take .rtf for instance and go to HKEY_CLASSES_ROOT\.rtf:
=====================
[HKEY_CLASSES_ROOT\.rtf]
@="Word.RTF.8"
"Content Type"="application/msword"

[HKEY_CLASSES_ROOT\.rtf\OpenWithList\WordPad.exe]
@=""

[HKEY_CLASSES_ROOT\.rtf\PersistentHandler]
@="{5e941d80-bf96-11cd-b579-08002b30bfeb}"

[HKEY_CLASSES_ROOT\.rtf\ShellNew]
"Data"="{\\rtf1}"
=====================
Then you go to Word.RTF.8 and see the various shell commands:
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Edit
HKEY_CLASSES_ROOT\Word.RTF.8\shell\New
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Open
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Print
HKEY_CLASSES_ROOT\Word.RTF.8\shell\Printto
=====================

 

[Kevin Spencer]

Here's a little method I wrote at one time to do this. It returns a string:

public static string GetFileType(string ext)
{
RegistryKey rKey = null;
RegistryKey sKey = null;
string FileType = "";

try
{
rKey = Registry.ClassesRoot;
sKey = rKey.OpenSubKey(ext);
if (sKey != null && (string)sKey.GetValue("", ext) != ext)
{
sKey = rKey.OpenSubKey((string)sKey.GetValue("", ext));
FileType = (string)sKey.GetValue("");
}
else
FileType = ext.Substring(ext.LastIndexOf('.') + 1).ToUpper() + " File";
return FileType;
}
finally
{
if (sKey != null) sKey.Close();
if (rKey != null) rKey.Close();
}
}

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Surgery

Who is Mighty Abbott? A twin-turret scalawag.

 

[Alan T]

Sorry, what does it returns?

'.doc', '.txt' ?

Here's a little method I wrote at one time to do this. It returns a
string:

public static string GetFileType(string ext)
{
RegistryKey rKey = null;
RegistryKey sKey = null;
string FileType = "";

try
{
rKey = Registry.ClassesRoot;
sKey = rKey.OpenSubKey(ext);
if (sKey != null && (string)sKey.GetValue("", ext) != ext)
{
sKey = rKey.OpenSubKey((string)sKey.GetValue("", ext));
FileType = (string)sKey.GetValue("");
}
else
FileType = ext.Substring(ext.LastIndexOf('.') + 1).ToUpper() + " File";
return FileType;
}
finally
{
if (sKey != null) sKey.Close();
if (rKey != null) rKey.Close();
}
}

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Surgery

Who is Mighty Abbott? A twin-turret scalawag.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Sorry, what does it returns?

'.doc', '.txt' ?

FileType = ext.Substring(ext.LastIndexOf('.') + 1).ToUpper() + " File";
return FileType;


Those two lines will give you the answer