How to use global variables from a dll in another (not multi-threaded)

With LabWindows/CVI. I try to be compatible with legacy code, so this isn't the best way to do things, but it saves me some headaches.

I have a project/.dll called "GlobalBlock" that contains some parameters used widely throughout the program. The entire program consists of several DLLs, for the purpose of encapsulation.

GlobalBlock.c contains:

menu_sdef G_setprefs = struct
{
... stuff

};

sys_fileheader_sdef Level1Version = struct
{
... more

};

struct G_sys_flags sys_flags_sdef;

In the dll that owns the variable, use the _export on this qualifier. This will ensure that it is placed in the list of the interface dll. In the application (dll or other) that wants to make reference to that variable, use the qualifier _import on it. This tells the system to use the associated import library that comes with the dll in order to resolve references running.

JR

Tags: NI Software

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