Problem with importing DLL into Inno-Setup.

Question

I am importing an C++ DLL in an innosetup install script. The DLL code is as follows:

void __stdcall SetFbParam(char *dbFileName,char *dbTableName,char *dbParamName,char *dbParamValue){
//of no use here and doesn't change anything}

In the Innosetup, I import it using

procedure FBset(dbFileName,dbTableName,dbParamName,dbParamValue: String;);

external 'SetFbParam@files:MyDll.dll stdcall setuponly';

However, I always get a runtime error during launch of the installer, saying that it cannot import my dll. I tried it with various calling conventions, but it always fails. If it's of any importance, I'm running Win7 x64 with UAC on ( the installer requests rights elevation and crashes after that).

The exact message is:
Error
Runtime error (at -1:0):
Cannot import
dll:C:\Users\Nevod\AppData\Local\Temp\is-6LOEC.tmp\MyDll.dll

The dll is there.

Thanks!

Answer 1

Is MyDll.dll 32-bit?

Does MyDll.dll depend on any other DLLs in the same directory? If so, you need to list the name(s) of those DLLs after "MyDll.dll" to ensure that they are extracted before MyDll.dll is loaded, and you likely need the "loadwithalteredsearchpath" option as well. Example from the help:

procedure ADllFunc(hWnd: Integer; lpText, lpCaption: String; uType: Cardinal);
external 'ADllFunc@files:A.dll,B.dll stdcall loadwithalteredsearchpath'; //A.dll depends on B.dll