Avoid hook closures in syscall.NewCallback, #20.
This commit is contained in:
Nuno Cruces
parent
a806229364
commit
a899c69072
1 changed files with 101 additions and 47 deletions
148
util_windows.go
148
util_windows.go
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@ -7,6 +7,7 @@ import (
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"reflect"
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"runtime"
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"strconv"
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"sync"
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"sync/atomic"
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"syscall"
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"unsafe"
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@ -155,58 +156,111 @@ func hookDialog(ctx context.Context, initDialog func(wnd uintptr)) (unhook conte
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if ctx != nil && ctx.Err() != nil {
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return nil, ctx.Err()
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}
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var hook, wnd uintptr
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callNextHookEx := callNextHookEx.Addr()
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tid, _, _ := getCurrentThreadId.Call()
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hook, _, err = setWindowsHookEx.Call(12, // WH_CALLWNDPROCRET
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syscall.NewCallback(func(code int32, wparam uintptr, lparam *_CWPRETSTRUCT) uintptr {
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if lparam.Message == 0x0110 { // WM_INITDIALOG
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var name [8]uint16
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getClassName.Call(lparam.Wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
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if syscall.UTF16ToString(name[:]) == "#32770" { // The class for a dialog box
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var close bool
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if ctx != nil && ctx.Err() != nil {
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close = true
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} else {
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atomic.StoreUintptr(&wnd, lparam.Wnd)
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}
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if close {
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sendMessage.Call(lparam.Wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
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} else if initDialog != nil {
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initDialog(lparam.Wnd)
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}
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}
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}
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next, _, _ := syscall.Syscall6(callNextHookEx, 4,
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hook, uintptr(code), wparam, uintptr(unsafe.Pointer(lparam)),
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0, 0)
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return next
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}), 0, tid)
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if hook == 0 {
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hook, err := newDialogHook(ctx, initDialog)
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if err != nil {
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return nil, err
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}
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if ctx == nil {
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return func() { unhookWindowsHookEx.Call(hook) }, nil
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return hook.unhook, nil
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}
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type dialogHook struct {
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ctx context.Context
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tid uintptr
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wnd uintptr
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hook uintptr
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done chan struct{}
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init func(wnd uintptr)
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}
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func newDialogHook(ctx context.Context, initDialog func(wnd uintptr)) (*dialogHook, error) {
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tid, _, _ := getCurrentThreadId.Call()
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hk, _, err := setWindowsHookEx.Call(12, // WH_CALLWNDPROCRET
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syscall.NewCallback(dialogHookProc), 0, tid)
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if hk == 0 {
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return nil, err
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}
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wait := make(chan struct{})
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go func() {
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select {
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case <-ctx.Done():
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if w := atomic.LoadUintptr(&wnd); w != 0 {
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sendMessage.Call(w, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
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}
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case <-wait:
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hook := dialogHook{
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ctx: ctx,
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tid: tid,
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hook: hk,
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init: initDialog,
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}
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if ctx != nil {
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hook.done = make(chan struct{})
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go hook.wait()
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}
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saveDialogHook(&hook)
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return &hook, nil
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}
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func initDialogHook(wnd uintptr) {
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tid, _, _ := getCurrentThreadId.Call()
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hook := loadDialogHook(tid)
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atomic.StoreUintptr(&hook.wnd, wnd)
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if hook.ctx != nil && hook.ctx.Err() != nil {
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sendMessage.Call(wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
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} else if hook.init != nil {
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hook.init(wnd)
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}
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}
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func (h *dialogHook) unhook() {
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deleteDialogHook(h.tid)
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if h.done != nil {
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close(h.done)
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}
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unhookWindowsHookEx.Call(h.hook)
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}
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func (h *dialogHook) wait() {
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select {
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case <-h.ctx.Done():
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if wnd := atomic.LoadUintptr(&h.wnd); wnd != 0 {
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sendMessage.Call(wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
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}
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}()
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return func() {
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unhookWindowsHookEx.Call(hook)
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close(wait)
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}, nil
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case <-h.done:
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}
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}
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func dialogHookProc(code int32, wparam uintptr, lparam *_CWPRETSTRUCT) uintptr {
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if lparam.Message == 0x0110 { // WM_INITDIALOG
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var name [8]uint16
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getClassName.Call(lparam.Wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
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if syscall.UTF16ToString(name[:]) == "#32770" { // The class for a dialog box
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initDialogHook(lparam.Wnd)
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}
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}
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next, _, _ := callNextHookEx.Call(
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0, uintptr(code), wparam, uintptr(unsafe.Pointer(lparam)))
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return next
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}
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var dialogHooks struct {
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sync.Mutex
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m map[uintptr]*dialogHook
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}
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func saveDialogHook(h *dialogHook) {
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dialogHooks.Lock()
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defer dialogHooks.Unlock()
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if dialogHooks.m == nil {
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dialogHooks.m = map[uintptr]*dialogHook{}
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}
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dialogHooks.m[h.tid] = h
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}
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func loadDialogHook(tid uintptr) *dialogHook {
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dialogHooks.Lock()
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defer dialogHooks.Unlock()
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return dialogHooks.m[tid]
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}
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func deleteDialogHook(tid uintptr) {
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dialogHooks.Lock()
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defer dialogHooks.Unlock()
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delete(dialogHooks.m, tid)
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}
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func hookDialogTitle(ctx context.Context, title *string) (unhook context.CancelFunc, err error) {
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