golang調(diào)用windows平臺的dll庫的方法實現(xiàn)
1、dll 和 golang 的編譯架構(gòu)要一直,32位對應(yīng)32位,64位對應(yīng)64位,比如如果dll是32位的,而golang是64位的,可能會報錯%1 is not a valid Win32 application.
2、有時候存在類型轉(zhuǎn)換,需要開啟CGO,比如,如果dll中的函數(shù)返回一個字符串,那么返回值是一個字符串指針,還需要將返回值轉(zhuǎn)換成go字符串
import "C" str := C.GoString((*C.Char)(unsafe.Pointer(ret)))
3、傳入dll函數(shù)的參數(shù)被要求是 uintptr 類型,因此需要做轉(zhuǎn)換。
func IntPtr(n int) uintptr {
return uintptr(n)
}
func Int2IntPtr(n int) uintptr {
return uintptr(unsafe.Pointer(&n))
}
func IntPtr2Ptr(n *int) uintptr {
return uintptr(unsafe.Pointer(n))
}
func BytePtr(s []byte) uintptr {
return uintptr(unsafe.Pointer(&s[0]))
}
func StrPtr(s string) uintptr {
return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
}
package main
import (
"fmt"
"syscall"
)
// 設(shè)置console模式下標準輸出的字體前景色
var f = "SetConsoleTextAttribute"
func main() {
f1()
f2()
f3()
f4()
}
func f1() {
// A LazyDLL implements access to a single DLL.
// It will delay the load of the DLL until the first
// call to its Handle method or to one of its
// LazyProc's Addr method.
//
// LazyDLL is subject to the same DLL preloading attacks as documented
// on LoadDLL.
//
// Use LazyDLL in golang.org/x/sys/windows for a secure way to
// load system DLLs.
dll := syscall.NewLazyDLL("kernel32.dll")
p := dll.NewProc(f)
r1, r2, lastError := p.Call(uintptr(syscall.Stdout), uintptr(3))
fmt.Println(r1, r2, lastError)
}
func f2() {
// LoadDLL loads the named DLL file into memory.
//
// If name is not an absolute path and is not a known system DLL used by
// Go, Windows will search for the named DLL in many locations, causing
// potential DLL preloading attacks.
//
// Use LazyDLL in golang.org/x/sys/windows for a secure way to
// load system DLLs.
dll, _ := syscall.LoadDLL("kernel32.dll")
p, _ := dll.FindProc(f)
r1, r2, lastError := p.Call(uintptr(syscall.Stdout), uintptr(4))
fmt.Println(r1, r2, lastError)
}
func f3() {
// MustLoadDLL is like LoadDLL but panics if load operation fails.
dll := syscall.MustLoadDLL("kernel32.dll")
p := dll.MustFindProc(f)
r1, r2, lastError := p.Call(uintptr(syscall.Stdout), uintptr(5))
fmt.Println(r1, r2, lastError)
}
func f4() {
handle, _ := syscall.LoadLibrary("kernel32.dll")
defer syscall.FreeLibrary(handle)
p, _ := syscall.GetProcAddress(handle, f)
r1, r2, errorNo := syscall.Syscall(p, 2, uintptr(syscall.Stdout), uintptr(6), 0)
fmt.Println(r1, r2, errorNo)
// 恢復(fù)到白色
syscall.Syscall(p, 2, uintptr(syscall.Stdout), uintptr(7), 0)
}

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