1. go 生成动态库
    - 必须添加import “C”
    - 必须在要导出的函数前添加 //export+空格+函数名

    1. package main
    3. import "C"
    4. import "fmt"
    6. //export PrintBye
    7. func PrintBye() {
    8.     fmt.Println("From DLL: Bye!")
    9. }
    11. //export Sum
    12. func Sum(a int, b int) int {
    13.     return a + b
    14. }
    16. func main() {
    17.     // Need a main function to make CGO compile package as C shared library
    18. }

    生成dll命令
    go build -ldflags "-s -w" -o main.dll -buildmode=c-shared main.go
    -s 、-w 指令用于减小动态链接库的体积，-s是压缩，-w是去掉调试信息。-o可以指定生成文件的目录。
    生成两个文件，main.dll 和main.h
    2. 调用动态库

    C调用dll

    1. #include <stdio.h>
    2. #include "Windows.h"
    3. int main() {
    4.     //加载动态库到内存
    5.     HMODULE hdll = LoadLibrary("exportgo.dll");
    6.     typedef int (*SUMFUN)(int, int);  // 定义函数指针类型
    7.     SUMFUN sum = (SUMFUN)GetProcAddress(hdll, "Sum");
    8.     int res = sum(3, 4);
    9.     printf("%d", res);
    10. }

    go调用dll

    1. package main
    3. import (
    4.     "fmt"
    5.     "syscall"
    6.     "unsafe"
    7. )
    9. func main() {
    10.     dll, _ := syscall.LoadDLL("exportgo.dll")
    11.     procSum, _ := dll.FindProc("Sum")
    12.     res, _, _ := procSum.Call(uintptr(3), uintptr(5))
    13.     fmt.Println(res)
    14. }
    15. func IntPtr(n int) uintptr {
    16.     return uintptr(n)
    17. }
    19. func StrPtr(s string) uintptr {
    20.     return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
    21. }