Comperio
31st July 2005 23:54 UTC

Registry API plugin/function help
This thread started as a result of http://forums.winamp.com/showthread....hreadid=218669

I have an idea that I wanted to try to implement in my own function using API calls to Advapi32.dll based on info from MSDN.

I'd like to use API calls instead of REGEDIT to import/export because of the fact that differnt versions REGEDIT export differently. If I could use API calls, I could keep the process consistant without having to use a lot of OS checks. (I'd also have more registry handling options available to me in case I needed to use them.) Plus since I'm not well-versed in C++, I thought this might offer a simple solution

However, this is where I'm having problems:
I'm trying to call RegOpenKeyEx, but am having some problems. Here's what I got so far. (I'm using Stardock an example just becuase it was something I had in my registry already):

strcpy $3 "SOFTWARE\Stardock"
System::Call 'Advapi32::RegOpenKeyEx(i 0x80000002,t r3,i 0,i 0xF003F,i .r1)i .r2'
DetailPrint 'Result: $2'
DetailPrint 'Handle: $1'

I'm getting an error code 87 returned an no reg key handle.
(FYI: The main hive handle values I found at the bottom of this site.)

I'm hoping that someone will be able to point me in the right direction. (If I can figure out this function then I should be able to figure out the rest.

Thanks!

Pidgeot
1st August 2005 01:30 UTC

From MSDN:

Return Values
If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is a nonzero error code defined in Winerror.h. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.

Assuming I'm looking at the right place in Winerror.h, this is what it says:

//
// MessageId: ERROR_INVALID_PARAMETER
//
// MessageText:
//
// The parameter is incorrect.
//
#define ERROR_INVALID_PARAMETER 87L // dderror

EDIT: Correct me if I'm wrong, but if I read the System plug-in documentation correctly, you need to prefix a variable with an asterisk to use a pointer to it instead. I think that's your problem - the fifth parameter of the function should be a pointer to your variable.

Comperio
1st August 2005 03:30 UTC

Hey, thanks for the tip! I'll give that a try.

PS: Where did you find WinError.h? Is that included with the NSIS source code or is it somewhere else?

Pidgeot
1st August 2005 04:13 UTC

It's in MSDN. Search for it, it should be the first result you find. The full name of the page is "Winerror.h [Protocol]".

If you have a local copy of MSDN, you'll probably have most luck if you search online, my local installation of MSDN (from the VS2005 beta 2) doesn't find it - though that may be because I don't have the C/C++ of the beta installed, and therefore no C/C++ documentation.

Comperio
1st August 2005 06:33 UTC

hmm... still no luck on getting the function call to work. I'll try more tomorrow...