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Chapter 3

Windows 95/NT Compiler/Linker Issues

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 National Instruments Corporation

3-13

LabWindows/CVI Programmer Reference Manual

module references any of the commonly used Windows SDK functions, you can use the 

cvi\sdk\include\basicsdk.h

 file. 

Execute the External Compiler Support command in the Build menu of the Project window. 
A dialog box appears. Enable the Using Load External Module option. Enable the Other 
Symbols checkbox if it is not already enabled. Enter the pathname of the include file in the 
Header File control. Enter the pathname of the object file to generate in the Object File 
control. Click on the Create button to the right of the Object File control. 

Include the object file in the external compiler project you use to create your executable. Also, 
you must call 

InitCVIRTE

 at the beginning of your 

main

 or 

WinMain

 function. Refer to the 

 section later in this chapter.

When you load an object or static library file from a DLL, you might want to resolve 
references from that module using global symbols the DLL contains, but does not export. You 
can do this by calling 

LoadExternalModuleEx

. When you pass the DLL module handle to 

LoadExternalModuleEx

, the Utility Library searches the symbol table the DLL contains 

before searching the table that the executable contains. Refer to Chapter 8, Utility Library, of 
the LabWindows/CVI Standard Libraries Reference Manual for detailed information on 

LoadExternalModuleEx

.

If you create your DLL in LabWindows/CVI, LabWindows/CVI includes the table of symbols 
in the DLL automatically. If you create your DLL using an external compiler, the external 
compiler does not make such a table available to the Utility Library. Thus, when you use an 
external compiler, you must include in your DLL one or more object files that contain the 
necessary symbol tables. You can do this using the technique that the previous section, 

, describes. You must call 

InitCVIRTE

 and 

CloseCVIRTE

 in your 

DLLMain

 function. Refer to the 

 section later in this chapter.

When you use a compiled module in LabWindows/CVI, you can arrange for 
LabWindows/CVI to notify the module of a change in the execution status such as start, stop, 
suspend, or resume. You do this through a callback function that is always named 

__RunStateChangeCallback.

 section, in 

Chapter 2, 

, of this manual, describes this in detail. 

The run state change callback capability in LabWindows/CVI is necessary because the 
LabWindows/CVI development environment executes your program as part of the 
LabWindows/CVI process. When your program terminates, the operating system does not 
release resources as it does when a process terminates. LabWindows/CVI attempts to release 

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