douwu0882
2015-01-08 20:41
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Golang:调用Windows DLL函数

I am writing a Go app that calls into a Windows DLL. The DLL was written with MSVC and has extern "C" exports using __declspec(dllexport).

The top of my Go app is as follows:

//#cgo CFLAGS: -IC:/Repos/Module/include
//#cgo LDFLAGS: -L. C:/Repos/Module/go/bin/MyModule.dll
//#include <MyModule.h>
import "C"

I'm calling functions from the module like so:

nRet := C.moduleImpl_len()

The problem is that when I try to run this app, I get the following error:

C:\Users\MINDO~1\AppData\Local\Temp\go-build836751819\mod\modimpl\_obj\modimpl.cgo2.o: In function `_cgo_e2aaf076ab69_Cfunc_moduleImpl_len':
C:/Repos/Module/go/src/mod/modimpl/modimpl.go:90: undefined reference to `moduleImpl_len'

I looked at the DLL exported symbols with DUMPBIN and it showed exactly "moduleImpl_len" as the exported symbol. This is also the symbol as defined in MyModule.h.

Any suggestions on how I can get the symbols to link without having to go the syscall route?

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  • dongyun8891 2015-01-31 00:06
    已采纳

    If you're trying to link against the dll you need/want "-lMyModule" in the LDFLAGS? https://stackoverflow.com/a/15853231/32453

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