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Registry String Array in CString how do I parse it?

Posted on 2000-03-09
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Last Modified: 2013-11-20
Hi out there,
as usually I've got a problem :)
I want to put a string array to the registry and read it back. For writing I use the function RegSetValueEx with parameter REG_MULTI_SZ.
The data that I pass to this function is created like this:

CString s;
s += _T("test");
s += _T("\n");
s += _T("string2");
s += _T("\n");

Now my first question ist the "\n" the correct separation character or should I use _T((char)0)); ?

Lets go on with reading.
The RegQueryValueEx function fills my CString but when I run IsEmpty() it always returns true. :(
Why?

Help

Tobias
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Comment
Question by:SirSmokeALot
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Accepted Solution

by:
ShaunWilde earned 50 total points
ID: 2600383
the RegSetValueEx type is a double NULL terminated list adn will not be possible to make using a CString.

By double NULL terminated list I mean the following

"test\0string2\0\0"

so what you need to do is create a char array that is big enough for all you strings and the null seperators in this case it is strlen("test")+strlen("string2")+3 (1 for each NULL '\0')

then copy them into your buffer putting the nulls in he correct places.

to extract is a bit easier

use RegQueryValueEx(...) to determine the size of the string and create you receiving buffer and then call RegQueryValueEx(...) again.

you then have to parse your string (pseudo code)

to get test out (char *buffer)

char *p=buffer;
CString szTest=p;
p+=szTest.GetLength()+1; // the plus one is to step past the NULL
CString szSecondString=p;

etc repeat until there are no more strings left ie p==NULL;

Or alternatively you can get a registry handling class from http://www.codeguru.com/system/index.shtml
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