2019独角兽企业重金招聘Python工程师标准>>> 
//调用方式
func WindowVersion1() {
h, err := syscall.LoadLibrary("kernel32.dll")
if err != nil {
fmt.Printf("Error: %s\n", err)
return
}
defer syscall.FreeLibrary(h)
proc, err := syscall.GetProcAddress(h, "GetVersion")
if err != nil {
fmt.Printf("Error: %s\n", err)
return
}
r, _, _ := syscall.Syscall(uintptr(proc), 0, 0, 0, 0)
major := byte(r)
minor := uint8(r >> 8)
build := uint16(r >> 16)
print("windows version ", major, ".", minor, " (Build ", build, ")\n")
}
func WindowVersion2() {
dll32 := syscall.NewLazyDLL("kernel32.dll")
g := dll32.NewProc("GetVersion")
r, _, _ := g.Call()
major := byte(r)
minor := uint8(r >> 8)
build := uint16(r >> 16)
print("windows version ", major, ".", minor, " (Build ", build, ")\n")
}//调用c++ dll
使用时将go生成的exe和c++生成的dll放在同一目录下即可.
C++:
//vs 2010,c++嵌入"::MessageBox(NULL, str, _T("..."), MB_OK);"用以调试时会引起程序崩溃.
//dlltest.h
DLL_API int __stdcall test1(LPTSTR s);
DLL_API int __stdcall test2(int *m);
//dlltest.cpp
int __stdcall test1(LPTSTR s)
{
CStringA sz(s);
cout<go:
func callDll1() {
dll32 := syscall.NewLazyDLL("dlltest.dll")
fmt.Println("dll name:", dll32.Name)
g := dll32.NewProc("_test1@4")
s := "1k中国fd"
r1, _, _ := g.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s))))
fmt.Println("callDll1结果:", r1)
}
func callDll2() {
dll32 := syscall.NewLazyDLL("dlltest.dll")
g := dll32.NewProc("_test2@4")
var m int32
m = 10
p := &m
fmt.Printf("%#v\n", p)
r1, _, _ := g.Call(uintptr(unsafe.Pointer(p)))
fmt.Println("callDll2结果:", (int32)(r1))
//获取修改后的m值
fmt.Println(*(*int32)(unsafe.Pointer(p))) //返回31
}dll尝试返回*string 报错原因:golang的string是struct以len判断结束,c/c++的string是以'\0'表示结束.,底层数据结果不同导致.所以使用dll传入传出数据时,要小心底层数据类型的一致性问题.