本用例在GO 1.4.2 上編譯執行經過，直接上CODE：
html
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下的另外一種DLL方法調用
func ShowMessage2(title, text string) {
user32 := syscall.NewLazyDLL("user32.dll")
MessageBoxW := user32.NewProc("MessageBoxW")
MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
}
func main() {
// defer syscall.FreeLibrary(kernel32)
defer syscall.FreeLibrary(user32)
//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)
ShowMessage2("windows下的另外一種DLL方法調用", "HELLO !")
time.Sleep(3 * time.Second)
}
func init() {
fmt.Print("Starting Up\n")
}
運行效果：git
---github
syscall延伸閱讀：golang
golang的OLE調用工具包
windows
---ui
如下介紹來源：http://wendal.net/2013/0406.htmlspa
syscall.Syscall系列方法
當前共5個方法.net
syscall.Syscallsyscall.Syscall6syscall.Syscall9syscall.Syscall12syscall.Syscall15
分別對應 3個/6個/9個/12個/15個參數或如下的調用code
參數都形如
syscall.Syscall(trap, nargs, a1, a2, a3)
第二個參數, nargs 即參數的個數,一旦傳錯, 輕則調用失敗,重者直接APPCARSH
多餘的參數, 用0代替
調用示例
獲取磁盤空間
//首先,準備輸入參數, GetDiskFreeSpaceEx須要4個參數, 可查MSDNdir := "C:"lpFreeBytesAvailable := int64(0)
//注意類型須要跟API的類型相符lpTotalNumberOfBytes := int64(0)lpTotalNumberOfFreeBytes := int64(0)
//獲取方法的引用kernel32, err := syscall.LoadLibrary("Kernel32.dll")
// 嚴格來講須要加上 defer syscall.FreeLibrary(kernel32)
// GetDiskFreeSpaceEx, err := syscall.GetProcAddress(syscall.Handle(kernel32), "GetDiskFreeSpaceExW")
//執行之. 由於有4個參數,故取Syscall6才能放得下. 最後2個參數,天然就是0了r, _, errno := syscall.Syscall6(uintptr(GetDiskFreeSpaceEx), 4,
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("C:"))),
uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),
uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),
uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes)), 0, 0)
// 注意, errno並不是error接口的, 不多是nil// 並且,根據MSDN的說明,返回值爲0就fail, 不爲0就是成功if r != 0 {
log.Printf("Free %dmb", lpTotalNumberOfFreeBytes/1024/1024)}
簡單點的方式? 用syscall.Call
跟Syscall系列同樣, Call方法最多15個參數. 這裏用來Must開頭的方法, 如不存在,會panic.
h := syscall.MustLoadDLL("kernel32.dll") c := h.MustFindProc("GetDiskFreeSpaceExW") lpFreeBytesAvailable := int64(0) lpTotalNumberOfBytes := int64(0) lpTotalNumberOfFreeBytes := int64(0) r2, _, err := c.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("F:"))), uintptr(unsafe.Pointer(&lpFreeBytesAvailable)), uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)), uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes))) if r2 != 0 { log.Println(r2, err, lpFreeBytesAvailable/1024/1024)