Rockwell Automation Publication 1789-UM002K-EN-P - January 2015 145
Develop External Routines Chapter 7
Export Functions by Using
C++ Export Style
If you export your external routine functions by using the C++ export style, make
sure that the EntryPoint value in your XML resource exactly matches the C++
decorated name that is exported by your C++ compiler.
Visual Studio software includes a tool (dumpbin.exe) that you can use to obtain
the C++ decorated name from your DLL file. The dumpbin.exe tool is installed
as part of Visual Studio product. The examples below show how to use this tool.
InlineExample.h
// Exported Functions:
__declspec(dllimport) int SumArray(EXT_ROUTINE_CONTROL* pERCtrl,
int Val[]);
InlineExample.cpp
__declspec(dllexport) int SumArray(EXT_ROUTINE_CONTROL* pERCtrl,
int Val[])
{
// body of function.
Run dumpbin.exe
Run dumpbin.exe with the /exports flag set to display the decorated names for all
of the exported routines. The following is the output running dumpbin /exports
on a C++ DLL.
For example, entering this command:
Dumpbin.exe /exports InlineExample.dll
displays this output information.
Microsoft (R) COFF Binary File Dumper Version 6.20.8700
Copyright (C) Microsoft Corp 1992-2000. All rights reserved.
Dump of file InlineExample.dll
File Type: DLL
Section contains the following exports for InlineExample.dll
0 characteristics
3BA9F7A0 time date stamp Thu Sep 20 10:05:20 2001
0.00 version
1 ordinal base
1 number of functions
1 number of names
ordinal hint RVA name
1 0 0000100A ?SumArray@@YAHPAUEXT_ROUTINE_CONTROL@@QAH@Z
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