Call Function from DLL witch returns True or False

[marcel-slip]

Hello,

I have a library. Dll file that has the function of checking the key in the registry. Library returns the value true or false. Can this somehow be supported by NSIS?
Here is an code with InstallShield:


prototype BOOL werk.werk();
prototype NUMBER werk.WriteToReg(POINTER, POINTER, POINTER);
prototype NUMBER werk.CreateRegKey();

function BOOL VerifySerial()
STRING szFileName;
　　NUMBER nResult;
　　BOOL bVerified;
begin　
　 szFileName = SUPPORTDIR ^ "some.dll";

　 nResult = UseDLL(szFileName);
　 if (nResult=0) then
　　　bVerified = some.some();
　 else　　　　　　　　　
　 　bVerified = FALSE;
　 　MessageBox(@MSG_DLLERROR, INFORMATION);
　 endif;
　 nResult = UnUseDLL(szFileName);
　
　 return bVerified;
end;

[Afrow UK]

Call it with the System plug-in.

Edit: Or convert it to an NSIS plug-in.
Or write the code in NSIS.

Stu

[marcel-slip]

Thank you for your reply.
I don't know how to do this. I do not have access to the source libraries and at the worst I have enough time to perform;)
Any example?

[Afrow UK]

There are many many examples of the 3 options I have outlined. You will find them here, on the Wiki and with your NSIS installation.

Stu

[marcel-slip]

Hello


I'm not as good with nsis-a. I tried to do is this:


Function some
SetOutPath c:\temp
File test.dll
System::Call 'test.dll::work() b(r0)'
DetailPrint 'Path: "$0"'
Dumpstate::debug ;test variable
FunctionEnd




I do not see any effect, the variable 0 has no value assigned

[Anders]

there is no such thing as b, you need to read the system plugin readme, you can't just make up types!

the windows BOOL type is 4 bytes, use i
the c++ bool type is 1 byte

[marcel-slip]

Thank you very much for your help.
The following function works:

Function werk
SetOutPath c:\temp
File test.dll
System::Call 'test.dll::work() i() .r3'
FunctionEnd


The $3 is the state of 0-folse or 1-true