nim 创建 dll
编译命令
nim c --app:lib --nomain:on test.nim
“--app:lib”表示生成动态链接库（dll）。
“--nomain:on”表示不生成 dllmain 函数。
源代码
test() 是我们自定义的导出函数。
import winim/lean
proc NimMain() {.cdecl, importc.}
proc test(): void {.cdecl, exportc, dynlib.} =
MessageBox(0, "test", "Nim is Powerful", 0)
proc DllMain(hinstDLL: HINSTANCE, fdwReason: DWORD, lpvReserved: LPVOID) : BOOL {.stdcall, exportc, dynlib.} =
NimMain()
case fdwReason:
of DLL_PROCESS_ATTACH:
MessageBox(0, "Hello, world !", "Nim is Powerful", 0)
of DLL_PROCESS_DETACH:
discard
of DLL_THREAD_ATTACH:
discard
of DLL_THREAD_DETACH:
discard
else:
discard
return true
使用 rundll32 运行，会依次弹出两个窗口。
rundll32 test.dll,test
如下图可以看到有3个导出函数。
自动生成 dllmian
如果不需要自己实现 dllmain 则可以这样写
import winim/lean
proc test(): void {.cdecl, exportc, dynlib.} =
MessageBox(0, "test", "Nim is Powerful", 0)
编译命令
nim c --app:lib --nomain:off test.nim
引用
https://nim-lang.org/docs/manual.html#foreign-function-interface-dynlib-pragma-for-export
https://github.com/byt3bl33d3r/OffensiveNim#creating-windows-dlls-with-an-exported-dllmain
https://forum.nim-lang.org/t/1973
https://nim-lang.org/docs/nimc.html
https://peterme.net/dynamic-libraries-in-nim.html
https://learn.microsoft.com/en-us/windows/win32/dlls/dllmain