zenity/util_windows.go

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package zenity
import (
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"context"
"fmt"
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"sync"
"syscall"
"unsafe"
)
var (
comdlg32 = syscall.NewLazyDLL("comdlg32.dll")
kernel32 = syscall.NewLazyDLL("kernel32.dll")
ole32 = syscall.NewLazyDLL("ole32.dll")
shell32 = syscall.NewLazyDLL("shell32.dll")
user32 = syscall.NewLazyDLL("user32.dll")
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wtsapi32 = syscall.NewLazyDLL("wtsapi32.dll")
commDlgExtendedError = comdlg32.NewProc("CommDlgExtendedError")
getCurrentThreadId = kernel32.NewProc("GetCurrentThreadId")
coInitializeEx = ole32.NewProc("CoInitializeEx")
coUninitialize = ole32.NewProc("CoUninitialize")
coCreateInstance = ole32.NewProc("CoCreateInstance")
coTaskMemFree = ole32.NewProc("CoTaskMemFree")
sendMessage = user32.NewProc("SendMessageW")
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getClassName = user32.NewProc("GetClassNameW")
setWindowsHookEx = user32.NewProc("SetWindowsHookExW")
unhookWindowsHookEx = user32.NewProc("UnhookWindowsHookEx")
callNextHookEx = user32.NewProc("CallNextHookEx")
enumChildWindows = user32.NewProc("EnumChildWindows")
getDlgCtrlID = user32.NewProc("GetDlgCtrlID")
setWindowText = user32.NewProc("SetWindowTextW")
)
func commDlgError() error {
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s, _, _ := commDlgExtendedError.Call()
if s == 0 {
return nil
} else {
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return fmt.Errorf("Common Dialog error: %x", s)
}
}
type _CWPRETSTRUCT struct {
Result uintptr
LParam uintptr
WParam uintptr
Message uint32
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Wnd uintptr
}
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func hookDialog(ctx context.Context, initDialog func(wnd uintptr)) (unhook context.CancelFunc, err error) {
if ctx != nil && ctx.Err() != nil {
return nil, ctx.Err()
}
var mtx sync.Mutex
var hook, wnd uintptr
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tid, _, _ := getCurrentThreadId.Call()
hook, _, err = setWindowsHookEx.Call(12, // WH_CALLWNDPROCRET
syscall.NewCallback(func(code int, wparam uintptr, lparam *_CWPRETSTRUCT) uintptr {
if lparam.Message == 0x0110 { // WM_INITDIALOG
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name := [8]uint16{}
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getClassName.Call(lparam.Wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
if syscall.UTF16ToString(name[:]) == "#32770" { // The class for a dialog box
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var close bool
mtx.Lock()
if ctx != nil && ctx.Err() != nil {
close = true
} else {
wnd = lparam.Wnd
}
mtx.Unlock()
if close {
sendMessage.Call(lparam.Wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
} else if initDialog != nil {
initDialog(lparam.Wnd)
}
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}
}
next, _, _ := callNextHookEx.Call(hook, uintptr(code), wparam, uintptr(unsafe.Pointer(lparam)))
return next
}), 0, tid)
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if hook == 0 {
return nil, err
}
if ctx == nil {
return func() { unhookWindowsHookEx.Call(hook) }, nil
}
wait := make(chan struct{})
go func() {
select {
case <-ctx.Done():
mtx.Lock()
w := wnd
mtx.Unlock()
if w != 0 {
sendMessage.Call(w, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
}
case <-wait:
}
}()
return func() {
unhookWindowsHookEx.Call(hook)
close(wait)
}, nil
}
func hookDialogTitle(ctx context.Context, title string) (unhook context.CancelFunc, err error) {
return hookDialog(ctx, func(wnd uintptr) {
ptr := syscall.StringToUTF16Ptr(title)
setWindowText.Call(wnd, uintptr(unsafe.Pointer(ptr)))
})
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}
type _COMObject struct{}
func (o *_COMObject) Call(trap uintptr, a ...uintptr) (r1, r2 uintptr, lastErr error) {
self := uintptr(unsafe.Pointer(o))
nargs := uintptr(len(a))
switch nargs {
case 0:
return syscall.Syscall(trap, nargs+1, self, 0, 0)
case 1:
return syscall.Syscall(trap, nargs+1, self, a[0], 0)
case 2:
return syscall.Syscall(trap, nargs+1, self, a[0], a[1])
default:
panic("COM call with too many arguments.")
}
}
type _IUnknownVtbl struct {
QueryInterface uintptr
AddRef uintptr
Release uintptr
}