golang 交叉编译C++ dll配置文件的实现

void helloword(void) {
    printf("Hello, World!\n");
}

const HELLODLLPATH = `C:\gopath\src\helloword_dll\libhelloword.dll`

func Hello1() {
	helloDll, e := syscall.LoadLibrary(HELLODLLPATH)
	if e != nil {
		panic(e)
	}
	helloword, e := syscall.GetProcAddress(helloDll, "helloword")
	if e != nil {
		panic(e)
	}
	_, _, er := syscall.Syscall(helloword, 0, 0, 0, 0)
	if er != 0 {
		panic(er)
	}
	e = syscall.FreeLibrary(helloDll)
	if e != nil {
		panic(e)
	}
}

func Helloword2() {
	helloDll := syscall.NewLazyDLL(HELLODLLPATH)
	hello := helloDll.NewProc("helloword")
	hello.Call()
}

func Helloword3() {
	helloDll := syscall.MustLoadDLL(HELLODLLPATH)
	hello := helloDll.MustFindProc("helloword")
	_, _, _ = hello.Call()
}

SET GOARCH=386
SET CGO_ENABLED=1

func IntPtr(n int) uintptr {
	return uintptr(n)
}
 
func BytesPtr(s []byte) uintptr {
	return uintptr(unsafe.Pointer(&s[0]))
}
 
func CnnDll2() {
	cnnDll := syscall.NewLazyDLL(CNNDLLPATH)
	//载入
	CNN_init := cnnDll.NewProc("CNN_init")
	bin := OpenBin()
	id, _, _ := CNN_init.Call(BytesPtr(bin), IntPtr(len(bin)), 0, 0, IntPtr(2), IntPtr(5))
 
	CNN_recognition := cnnDll.NewProc("CNN_recognition")
	img := OpenImg()
	//识别
	ret, _, _ := CNN_recognition.Call(id, BytesPtr(img), IntPtr(len(img)), IntPtr(2))
	var recode []byte
	for i := 0; true; i++ {
		tmp := *(*byte)(unsafe.Pointer(ret + uintptr(i)))
		if tmp != 0 {
			recode = append(recode, tmp)
		} else {
			break
		}
	}
	fmt.Println("#ret", recode, string(recode))
}

import "C"
reStr := C.GoString((*C.char)(unsafe.Pointer(ret)))