go语言调用标准标准dll

最近有个客户需要使用go语言调用我们的dll库，于是写了个示例程序支持客户

package main

import "C"
import (
    "fmt"
    "syscall"
    "unsafe"
)

func IntPtr(n int) uintptr {
    return uintptr(n)
}

func StrPtr(s string) uintptr {
    return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}
func Lib_initChinalinEncrypt() {
    lib := syscall.NewLazyDLL("OrderEncrypt_x64.dll")
    fmt.Println("dll:", lib.Name)
    initChinalinEncrypt := lib.NewProc("initChinalinEncrypt")
    fmt.Println("+++++++initChinalinEncrypt Proc:", initChinalinEncrypt, "Hellow")

    ret, _, err := initChinalinEncrypt.Call()
    if err != nil {
        fmt.Println("lib.dll initChinalinEncrypt 运算结果为:", ret)
    }
}

func Lib_authorize() {
    lib := syscall.NewLazyDLL("OrderEncrypt_x64.dll")
    fmt.Println("dll:", lib.Name)

    authorize := lib.NewProc("authorize")
    fmt.Println("+++++++authorize Proc:", authorize, "Hellow")

    user_name := C.CString("username1")
    username := uintptr(unsafe.Pointer((&user_name)))

    pass_word := C.CString("password")
    password := uintptr(unsafe.Pointer((&pass_word)))

    ret, _, err := authorize.Call(username, uintptr(uint64(len("username"))),password,uintptr(uint64(len("password"))))
    if err != nil {
        fmt.Println("OrderEncrypt_x64.dll authorize 运算结果为:", ret)
    }
}

func Lib_encryptFile() {
    lib := syscall.NewLazyDLL("OrderEncrypt_x64.dll")
    fmt.Println("dll:", lib.Name)

    encryptFile := lib.NewProc("encryptFile")
    fmt.Println("+++++++encryptFile Proc:", encryptFile, "Hellow")

    src_File := C.CString("D:\\a\\ordersgo.txt")
    srcFile := uintptr(unsafe.Pointer((&src_File)))

    dst_File := C.CString("D:\\a\\out_ordersgo.txt")
    dstFile := uintptr(unsafe.Pointer((&dst_File)))

    ret, _, err := encryptFile.Call(srcFile, uintptr(uint64(len("srcFile"))),dstFile,uintptr(uint64(len("dstFile"))))
    if err != nil {
        fmt.Println("OrderEncrypt_x64.dll encryptFile 运算结果为:", ret)
    }
}

func main() {
    Lib_initChinalinEncrypt()
    Lib_authorize()
    fmt.Println("Hellow")
}
 

cgo传参对照表

注意的是golang由于数据类型和c++的不一致，在需要传参的时候需要把所有的参数都转换成uintptr指针类型，而且转换的过程需要借助unsafe.Pointer指针