dll issue

[conanjou]

I practice to use one external dll as attached file.
and the code as below：
Macro Macro2

Code:

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typelib QMPlugin "D:\Bkgnd.dll"
QMPlugin.Bkgnd a._create

and QM shows that error message：

Dynamic-link library (DLL) initialization routine failed

and the code as below：

Macro Macro2

Code:

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typelib QMPlugin "D:\Bkgnd.dll"
QMPlugin.Bkgnd a.GetPixelColor(0 0 0)

and QM shows that error message：
interface pointer variable is 0

This is my first time to practice to use dll function, and I don't know how to solve them...

[Gintaras]

Is the dll registered as a COM component on your PC?
The code is correct, and usually works without registration, but maybe this dll wants to be registered anyway.

[conanjou]

I use Tools/Type Libraries and register component and library again, it shows that results ： Component :failed Library:Success (I remember the results ： Component :Success Library:Success for first time ?)
Is correct?

[Gintaras]

Try to register with regsvr32.exe, it probably has a "verbose" option that may give more info why it fails.
Before, exit QM to make sure that the dll is not loaded.

[conanjou]

I try to use other dll file , it can successfully run, I think the root cause is "class name".
Because, the other dll file , I know the class name.

BTW, if I don't know the "class name" for some dll files, whether any methods can get it or not?

[Gintaras]

Don't need to specify class name with _create if you use type library.

[conanjou]

Yes, you are right. I don't specify any class name for other dll file , and it can run successfully.
But, the code can not work for previous dll file , I think that it should not be used for QM.

Thanks again.