How can i register my file extension in HKEY_CLASSES_ROOT through vc++ source code

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hi,

I created my own file extension .sos and i registered it in HKEY_CLASSES_ROOT manually .It is working.

But
How can i register & unregister it using vc++ code?

guide me to implement the code.

Thanks in advance.

Posted 20-May-12 17:23pm

rajesh482

Updated 20-May-12 17:37pm

v2

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2 solutions

Solution 1

You said when you manually register your extension it works, then you must know what keys to write. It it not working in code, maybe your app does not have privileges to write to those registry keys.

Posted 20-May-12 22:07pm

Mudaka

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rajesh482 21-May-12 5:28am

Thank you.
What i mean is suppose we have notepad setup file,when we double click on it automatically it register the file extension and all the things what application required no need do it manually. These things are achieve through inbuilt code only.

So i want to prepare exe File When we Double click on it.It will so the all the above process.
Could you please tell me How can i do this one?

Mudaka 21-May-12 6:02am

Sorry I might not have gotten your question correctly. If you want to know how to write a registry key, there are these two Windows functions that you need: RegOpenKeyEx and RegSetValueEx. You can find their usage in MSDN.

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Richard MacCutchan · Accepted Answer · 2012-05-21T03:48:00

Solution 2

There are a number of keys that need to be set in order for this to work.

Create a new key in HKEY_CLASSES_ROOT for this file extension string (including the leading dot character) and set its default value to a unique name that you can use to link the two together. This will give the following key and value:

HKEY_CLASSES_ROOT\.ext
Default extfile

Create a subkey OpenWithList\application.exe where application.exe is the name of the application that will handle files with this extension. You now have the key:

HKEY_CLASSES_ROOT\.ext\OpenWithList\application.exe

Create a key with the same name as the default value in the HKEY_CLASSES_ROOT\.ext key and set its default value to the unadorned name of the application as used in OpenWithList\application.exe, giving the key and value:

HKEY_CLASSES_ROOT\extfile
Default application file

Add a subkey to the Applications key in HKEY_CLASSES_ROOT as follows, and set its default value to the full path of your application followed by a placeholder for the filename when you click on it, thus:

HKEY_CLASSES_ROOT\Applications\application.exe\shell\open\command
Default C:\Program Files\Utilities\application.exe %1

Add a similar subkey to the extfile key thus:

HKEY_CLASSES_ROOT\extfile\shell\open\command
Default C:\Program Files\Utilities\application.exe %1

Note how the extension, the "extension type" name and the program name are linked in order for this to work.

Posted 21-May-12 3:48am

Richard MacCutchan

Comments

rajesh482 7-Jun-12 10:49am

thank you.
I did this already.We need to do this manually.

How can i acheive this through the code? (means when i double on my exe it has do this registration process)

Richard MacCutchan 7-Jun-12 11:00am

Well, I have explained that to you in the above answer. Write a program which will set the various registry keys as shown.

rajesh482 8-Jun-12 11:48am

thank you sir

But how can i place this code in proper manner into my source code

rajesh482 5-Jun-13 5:51am

This is the code to register extenstion
=============================================
int RegisterExtenstion( )
{
HKEY hkey;

if (ERROR_SUCCESS==RegOpenKey(HKEY_CLASSES_ROOT,".mfe",&hkey))
{
RegCloseKey(hkey);
AfxMessageBox("This Extension is already registered");
GetDlgItem(IDOK)->ShowWindow(SW_HIDE);
return 0;
}
CString sExt=".mfe";
CString sDescription="My File Extension";

sDescription.Replace(" ",""); //revoing spaces in Description
sExt.Replace(" ",""); // sExt – extension to register

sExt.Replace(".","");
sExt="."+sExt;

CString app=GetCommandLine(); // Getting the application Path

app.TrimLeft(_T("\"")); app.TrimRight(_T("\""));

CString str,strIcon;
str.Format(_T("%s"),app);
PathRemoveFileSpec((LPTSTR)(LPCTSTR)str) ; //for this #include "shlwapi.h"
//#pragma comment(lib,"Shlwapi.lib")
strIcon.Format(_T("%s\\Sample.ico \0"),str);//place "Sample icon" in exe folder

app+=" \"%1\"";

RegOpenKeyEx(HKEY_CLASSES_ROOT,"",0,KEY_QUERY_VALUE,&hkey);
DWORD dw;

RegCreateKeyEx(hkey, sExt.operator LPCTSTR() , 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL,&hkey, &dw );

CString key=sDescription;

RegSetValueEx(hkey,"",0,REG_SZ,(BYTE *)key.operator LPCTSTR(),
key.GetLength());
RegCloseKey(hkey);

RegOpenKeyEx(HKEY_CLASSES_ROOT,"",0,KEY_QUERY_VALUE,&hkey);

RegCreateKeyEx (hkey, key, 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL, &hkey, &dw);

RegCreateKeyEx (hkey, "shell", 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL,&hkey, &dw);

RegCreateKeyEx (hkey, "open", 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL,&hkey, &dw);

RegCreateKeyEx (hkey, "command", 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL,&hkey, &dw);

RegSetValueEx(hkey,"",0,REG_SZ, (LPBYTE)(LPCTSTR)app,app.GetLength());
RegCloseKey(hkey);

RegOpenKeyEx(HKEY_CLASSES_ROOT,key,0,KEY_QUERY_VALUE,&hkey);
RegCreateKeyEx (hkey, "DefaultIcon", 0L, NULL,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL,&hkey, &dw);

RegSetValueEx(hkey,"",0,REG_SZ, (LPBYTE)(LPCTSTR)strIcon,strIcon.GetLength());
RegCloseKey(hkey);

return 1;
}

Richard MacCutchan 5-Jun-13 5:52am

And?