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go 调用windows dll 的三种方法
- Go语言
- 2021-04-09
- 932人已阅读
第三种方法是从Go\src\internal\syscall\windows\sysdll源码中找到的，三种方法的具体区别还不是很明晰，
初步判断：lazy应该是相当于动态库，其余两种直接把库加载到内存。
package main
import(
"fmt"
"syscall"
"time"
"unsafe"
)
const (
MB_OK = 0x00000000
MB_OKCANCEL = 0x00000001
MB_ABORTRETRYIGNORE = 0x00000002
MB_YESNOCANCEL = 0x00000003
MB_YESNO = 0x00000004
MB_RETRYCANCEL = 0x00000005
MB_CANCELTRYCONTINUE = 0x00000006
MB_ICONHAND = 0x00000010
MB_ICONQUESTION = 0x00000020
MB_ICONEXCLAMATION = 0x00000030
MB_ICONASTERISK = 0x00000040
MB_USERICON = 0x00000080
MB_ICONWARNING = MB_ICONEXCLAMATION
MB_ICONERROR = MB_ICONHAND
MB_ICONINFORMATION = MB_ICONASTERISK
MB_ICONSTOP = MB_ICONHAND
MB_DEFBUTTON1 = 0x00000000
MB_DEFBUTTON2 = 0x00000100
MB_DEFBUTTON3 = 0x00000200
MB_DEFBUTTON4 = 0x00000300
)
func abort(funcname string, err syscall.Errno) {
panic(funcname + " failed: " + err.Error())
}
var (
user32, _ = syscall.LoadLibrary("user32.dll")
messageBox, _ = syscall.GetProcAddress(user32, "MessageBoxW")
)
func IntPtr(n int) uintptr {
return uintptr(n)
}
func StrPtr(s string) uintptr {
return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}
func MessageBox(caption, text string, style uintptr) (result int) {
ret, _, callErr := syscall.Syscall9(messageBox,
4,
0,
StrPtr(text),
StrPtr(caption),
style,
0, 0, 0, 0, 0)
if callErr != 0 {
abort("Call MessageBox", callErr)
}
result = int(ret)
return
}
//func GetModuleHandle() (handle uintptr) {
// if ret, _, callErr := syscall.Syscall(getModuleHandle, 0, 0, 0, 0); callErr != 0 {
// abort("Call GetModuleHandle", callErr)
// } else {
// handle = ret
// }
// return
//}
// windows下的第二种DLL方法调用
func ShowMessage2(title, text string) {
user32 := syscall.NewLazyDLL("user32.dll")
MessageBoxW := user32.NewProc("MessageBoxW")
MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
}
// windows下的第三种DLL方法调用
func ShowMessage3(title, text string) {
user32,_ := syscall.LoadDLL("user32.dll")
MessageBoxW,_ := user32.FindProc("MessageBoxW")
MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
}
func main() {
defer syscall.FreeLibrary(user32)
num := MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL)
fmt.Printf("Get Retrun Value Before MessageBox Invoked: %d\n", num)
ShowMessage2("windows下的另一种DLL方法调用", "HELLO !")
ShowMessage3("windows下的第三种DLL方法调用", "lyslyslys !")
time.Sleep(3 * time.Second)
}
func init() {
fmt.Print("Starting Up\n")
}