RegSetValueEx and REG_MULTI_SZ

Im using RegSetValueEx to write to the registry. Everything works great, but i have a problem when writing to a REG_MULTI_SZ.

If you are familiar with how a REG_MULTI_SZ works, the value should be like this:

Code:

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value1
value2
value3

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My question is: How can I seperate the values?
Now i get:

Code:

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value1 value2 value3

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And this aint working.

Please explain this to me or post some example code:D

Iw searched this forum and google, without getting any smarter.

I dont have my code here atm(im at work) but if its needed i can post it later.

Each value is terminated with a nul character and the last value is followed by two nul characters. This is explained under registry value types.

Code:

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TEXT("value1\0value2\0value3\0")

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In this example, we are using a string literal which automatically appends one nul character.

thank you. That url helped me:D

Quote:

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When calculating the length of a REG_MULTI_SZ string, add the length of each of the component strings, as above, and add one for the final terminating null.

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that was my problem.

I am trying to write an array of strings into the registry and I tried the method that MSDN advises.

My registry entry is "security code"
Ex. I had a hard-coded string for testing purposes "111\0222\0333\0444\0\0"
So technically the registry should have

111
222
333
444

But, I checked and the REG_MULTI_SZ type string entry it only has 111.
What am I doing wrong here?

Is there some special method that you used to get it working. You mention that the MSDN webpage helped you, I read the same thing and I can't think of anything I am missing.

Kindly advise.

Better to start a new thread then necro a 4 year old one...

Did you use strlen() or lstrlen() to calc the string length? (as it only counts to the first null terminator)

Otherwise post some code.

I figured that out, as I was using strlen, it was terminating the count upto the first null.

Now my main question is I have a CStringArray. Now I want each element of that array put in a C-style string that I can write to REG_MULTI_SZ value.
So for ex. if my CStringArray contains 111, 222, 333, 444, 555, I should ideally have the null terminated string as "111\0222\0333\0444\0555\0\0" to be able to write it in type REG_MULTI_SZ.

I cannot seem to be able to write multiple nulls into the same C Style string. Can anyone help?

For a small constant number of elements in the reg setting, something like...

Code:

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CStringArray sRegArray;

//fill array

char szBuffer[MAX_PATH]={0};

_snprintf(szBuffer, MAX_PATH-1, "%s\0%s\0%s\0\0", sRegArray[0], sRegArray[1], sRegArray[2]);

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