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129 lines
2.6 KiB
Go
129 lines
2.6 KiB
Go
// Copyright 2013 @atotto. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package clipboard
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import (
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"syscall"
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"time"
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"unsafe"
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)
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const (
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cfUnicodetext = 13
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gmemMoveable = 0x0002
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)
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var (
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user32 = syscall.MustLoadDLL("user32")
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openClipboard = user32.MustFindProc("OpenClipboard")
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closeClipboard = user32.MustFindProc("CloseClipboard")
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emptyClipboard = user32.MustFindProc("EmptyClipboard")
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getClipboardData = user32.MustFindProc("GetClipboardData")
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setClipboardData = user32.MustFindProc("SetClipboardData")
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kernel32 = syscall.NewLazyDLL("kernel32")
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globalAlloc = kernel32.NewProc("GlobalAlloc")
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globalFree = kernel32.NewProc("GlobalFree")
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globalLock = kernel32.NewProc("GlobalLock")
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globalUnlock = kernel32.NewProc("GlobalUnlock")
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lstrcpy = kernel32.NewProc("lstrcpyW")
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)
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// waitOpenClipboard opens the clipboard, waiting for up to a second to do so.
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func waitOpenClipboard() error {
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started := time.Now()
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limit := started.Add(time.Second)
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var r uintptr
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var err error
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for time.Now().Before(limit) {
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r, _, err = openClipboard.Call(0)
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if r != 0 {
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return nil
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}
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time.Sleep(time.Millisecond)
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}
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return err
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}
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func readAll() (string, error) {
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err := waitOpenClipboard()
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if err != nil {
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return "", err
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}
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defer closeClipboard.Call()
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h, _, err := getClipboardData.Call(cfUnicodetext)
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if h == 0 {
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return "", err
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}
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l, _, err := globalLock.Call(h)
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if l == 0 {
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return "", err
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}
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text := syscall.UTF16ToString((*[1 << 20]uint16)(unsafe.Pointer(l))[:])
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r, _, err := globalUnlock.Call(h)
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if r == 0 {
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return "", err
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}
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return text, nil
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}
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func writeAll(text string) error {
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err := waitOpenClipboard()
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if err != nil {
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return err
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}
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defer closeClipboard.Call()
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r, _, err := emptyClipboard.Call(0)
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if r == 0 {
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return err
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}
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data := syscall.StringToUTF16(text)
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// "If the hMem parameter identifies a memory object, the object must have
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// been allocated using the function with the GMEM_MOVEABLE flag."
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h, _, err := globalAlloc.Call(gmemMoveable, uintptr(len(data)*int(unsafe.Sizeof(data[0]))))
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if h == 0 {
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return err
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}
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defer func() {
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if h != 0 {
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globalFree.Call(h)
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}
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}()
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l, _, err := globalLock.Call(h)
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if l == 0 {
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return err
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}
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r, _, err = lstrcpy.Call(l, uintptr(unsafe.Pointer(&data[0])))
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if r == 0 {
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return err
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}
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r, _, err = globalUnlock.Call(h)
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if r == 0 {
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if err.(syscall.Errno) != 0 {
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return err
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}
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}
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r, _, err = setClipboardData.Call(cfUnicodetext, h)
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if r == 0 {
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return err
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}
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h = 0 // suppress deferred cleanup
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return nil
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}
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