go 调用windows dll 的方法 ，代码如下：
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 (
// kernel32, _ = syscall.LoadLibrary("kernel32.dll")
// getModuleHandle, _ = syscall.GetProcAddress(kernel32, "GetModuleHandleW") 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下的另一种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(kernel32)
defer syscall.FreeLibrary(user32) //释放指定的动态链接库 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", "HELLO3 !") //fmt.Printf("Retern: %d\n", MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL))
num := MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL)
fmt.Printf("Get Retrun Value Before MessageBox Invoked: %d\n", num) time.Sleep(3 * time.Second)
} func init() {
fmt.Print("Starting Up\n")
}