October 25, 2010
I'm trying to read from the registry (thus far unsuccesfully). core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to use it to read a registry key. However, when I use it, I get this error upon compilation:

Error 42: Symbol Undefined _RegOpenKeyExA@20

I'm using wine, and according to http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be implemented. So, what on earth could I be missing? Any help would be much appreciated.

- Jonathan M Davis
October 25, 2010
On Mon, 25 Oct 2010 05:03:50 +0400, Jonathan M Davis <jmdavisProg@gmx.com> wrote:

> I'm trying to read from the registry (thus far unsuccesfully).
> core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to use it to
> read a registry key. However, when I use it, I get this error upon compilation:
>
> Error 42: Symbol Undefined _RegOpenKeyExA@20
>
> I'm using wine, and according to
> http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be
> implemented. So, what on earth could I be missing? Any help would be much
> appreciated.
>
> - Jonathan M Davis

This function isn't implemented in Phobos, it's implemented in advapi32.dll
You either need to link with advapi32.lib or a linkage.def file with the following contents (without quotes):

"EXETYPE NT

IMPORTS
_RegOpenKeyExA@20 = advapi32.RegOpenKeyExA"

Hope that helps.
October 25, 2010
On Sunday 24 October 2010 18:20:53 Denis Koroskin wrote:
> On Mon, 25 Oct 2010 05:03:50 +0400, Jonathan M Davis <jmdavisProg@gmx.com>
> 
> wrote:
> > I'm trying to read from the registry (thus far unsuccesfully).
> > core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to
> > use it to
> > read a registry key. However, when I use it, I get this error upon
> > compilation:
> > 
> > Error 42: Symbol Undefined _RegOpenKeyExA@20
> > 
> > I'm using wine, and according to http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be implemented. So, what on earth could I be missing? Any help would be much appreciated.
> > 
> > - Jonathan M Davis
> 
> This function isn't implemented in Phobos, it's implemented in advapi32.dll You either need to link with advapi32.lib or a linkage.def file with the following contents (without quotes):
> 
> "EXETYPE NT
> 
> IMPORTS
> _RegOpenKeyExA@20 = advapi32.RegOpenKeyExA"
> 
> Hope that helps.

I haven't had this problem with any other windows calls that I've used. As long as they've been in druntime, they've worked. Are you suggesting that that's the case because Phobos or druntime also happened to link aganst any of the other windows functions that I've used, and that in this case, they don't, so I have to link it explicitly?

- Jonathan M Davis
October 25, 2010
On Sunday 24 October 2010 20:33:40 Jonathan M Davis wrote:
> On Sunday 24 October 2010 18:20:53 Denis Koroskin wrote:
> > On Mon, 25 Oct 2010 05:03:50 +0400, Jonathan M Davis <jmdavisProg@gmx.com>
> > 
> > wrote:
> > > I'm trying to read from the registry (thus far unsuccesfully).
> > > core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to
> > > use it to
> > > read a registry key. However, when I use it, I get this error upon
> > > compilation:
> > > 
> > > Error 42: Symbol Undefined _RegOpenKeyExA@20
> > > 
> > > I'm using wine, and according to http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be implemented. So, what on earth could I be missing? Any help would be much appreciated.
> > 
> > This function isn't implemented in Phobos, it's implemented in advapi32.dll You either need to link with advapi32.lib or a linkage.def file with the following contents (without quotes):
> > 
> > "EXETYPE NT
> > 
> > IMPORTS
> > _RegOpenKeyExA@20 = advapi32.RegOpenKeyExA"
> > 
> > Hope that helps.
> 
> I haven't had this problem with any other windows calls that I've used. As long as they've been in druntime, they've worked. Are you suggesting that that's the case because Phobos or druntime also happened to link aganst any of the other windows functions that I've used, and that in this case, they don't, so I have to link it explicitly?

It looks liking adding advapi32.lib to the compilation command does the trick, but I don't know why I've never needed to do that before with other Windows functions.

- Jonathan M Davis
October 25, 2010
On 25.10.2010 08:06, Jonathan M Davis wrote:
[...]
> It looks liking adding advapi32.lib to the compilation command does the trick,
> but I don't know why I've never needed to do that before with other Windows
> functions.

Just guessing, but it might be that dmd doesn't add advapi32.dll to the linker's command line by default.  You can probably verify that by passing -v to dmd, to see the linker commands being used.
October 25, 2010
On Mon, 25 Oct 2010 07:33:40 +0400, Jonathan M Davis <jmdavisProg@gmx.com> wrote:

> On Sunday 24 October 2010 18:20:53 Denis Koroskin wrote:
>> On Mon, 25 Oct 2010 05:03:50 +0400, Jonathan M Davis <jmdavisProg@gmx.com>
>>
>> wrote:
>> > I'm trying to read from the registry (thus far unsuccesfully).
>> > core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to
>> > use it to
>> > read a registry key. However, when I use it, I get this error upon
>> > compilation:
>> >
>> > Error 42: Symbol Undefined _RegOpenKeyExA@20
>> >
>> > I'm using wine, and according to
>> > http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be
>> > implemented. So, what on earth could I be missing? Any help would be  
>> much
>> > appreciated.
>> >
>> > - Jonathan M Davis
>>
>> This function isn't implemented in Phobos, it's implemented in advapi32.dll
>> You either need to link with advapi32.lib or a linkage.def file with the
>> following contents (without quotes):
>>
>> "EXETYPE NT
>>
>> IMPORTS
>> _RegOpenKeyExA@20 = advapi32.RegOpenKeyExA"
>>
>> Hope that helps.
>
> I haven't had this problem with any other windows calls that I've used. As long
> as they've been in druntime, they've worked. Are you suggesting that that's the
> case because Phobos or druntime also happened to link aganst any of the other
> windows functions that I've used, and that in this case, they don't, so I have
> to link it explicitly?
>
> - Jonathan M Davis

Yes, it links with some of the libraries implicitly.
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