change txt file type default icon

hello everybody,
i want to change the default icon of the txt file type on windows this can done if we chabged the following registry Key using QSettings
HKEY_CLASSES_ROOT\txtfile\DefaultIcon\Default value
and set it's value to the path of my program.
how can i do that ???
thank you.

But what's the problem? You know the registry path and you know QSettings. If you don't know how to use QSettings, go read its great docs full of examples:
http://doc.trolltech.com/latest/qset...istry-directly.

i just did as described in the documentation.
it is said in the documentation that windows keys can have default value and to change it just refer to the key as follows

Code:

---

settings.setValue("HKEY_CLASSES_ROOT\\txtfile\\DefaultIcon", "D:\\Work space\\MY Projects\\executable\\MyEditor.exe");

---

when i did that nothing happens.
where is the wrong?

What does mean "nothing happens"? Did you check the value with Regedit? Shoudn't "DefaultIcon" refer to an icon file?

Try with

Code:

---

settings.setValue("HKEY_CLASSES_ROOT\\txtfile\\DefaultIcon", "\"D:\\Work space\\MY Projects\\executable\\MyEditor.exe,0\"");

---

i tried but nothing happens the defaultIcon Key is still as it was . it was
%SystemRoot%\system32\shell32.dll,-152
and it is still.
note that i tried settings.contains() to be sure that the Key is exist and be shown by
my program and it returns true which means that the program see the Key but can not
change it i dont know why!!!

Quote:

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What does mean "nothing happens"?

---

i mean that the key did not changed.

Quote:

---

Did you check the value with Regedit?

---

yes, i checked it . it is still as it was.

How did you create QSettings object? It should be done this way:

Code:

---

QSettings settings("HKEY_CLASSES_ROOT\\txtfile",QSettings::NativeFormat);
// Then edit subkeys.
settings.setValue("DefaultIcon", "\"D:\\Work space\\MY Projects\\executable\\MyEditor.exe,0\"");

---

when i did that a new key called DefaultIcon is added in the Path
HKEY_CLASSES_ROOT\\txtfile
with the value
"D:\Work space\MY Projects\executable\MyEditor.exe,0"
note the double quotation.
and thank you for your co-operation.