module clipboard import time #flag -lUser32 struct WndClassEx { cb_size u32 style u32 lpfn_wnd_proc voidptr cb_cls_extra int cb_wnd_extra int h_instance C.HINSTANCE h_icon C.HICON h_cursor C.HCURSOR hbr_background C.HBRUSH lpsz_menu_name &u16 // LPCWSTR lpsz_class_name &u16 h_icon_sm &u16 } fn C.RegisterClassEx(class WndClassEx) int fn C.GetClipboardOwner() &C.HWND fn C.CreateWindowEx(dwExStyle i64, lpClassName &u16, lpWindowName &u16, dwStyle i64, x int, y int, nWidth int, nHeight int, hWndParent i64, hMenu voidptr, h_instance voidptr, lpParam voidptr) &C.HWND // fn C.MultiByteToWideChar(CodePage u32, dw_flags u16, lpMultiByteStr byteptr, cbMultiByte int, lpWideCharStr u16, cchWideChar int) int fn C.EmptyClipboard() fn C.CloseClipboard() fn C.GlobalAlloc(uFlag u32, size i64) C.HGLOBAL fn C.GlobalFree(buf C.HGLOBAL) fn C.GlobalLock(buf C.HGLOBAL) fn C.GlobalUnlock(buf C.HGLOBAL) fn C.SetClipboardData(uFormat u32, data voidptr) C.HANDLE fn C.GetClipboardData(uFormat u32) C.HANDLE fn C.DefWindowProc(hwnd C.HWND, msg u32, wParam C.WPARAM, lParam C.LPARAM) C.LRESULT fn C.SetLastError(error i64) fn C.OpenClipboard(hwnd C.HWND) int fn C.DestroyWindow(hwnd C.HWND) struct Clipboard { max_retries int retry_delay int mut: hwnd C.HWND foo int // TODO remove } fn (cb &Clipboard) get_clipboard_lock() bool { mut retries := cb.max_retries mut last_error := u32(0) for { retries-- if retries < 0 { break } last_error = C.GetLastError() if C.OpenClipboard(cb.hwnd) > 0 { return true } else if last_error != u32(C.ERROR_ACCESS_DENIED) { return false } time.sleep(cb.retry_delay) } C.SetLastError(last_error) return false } fn new_clipboard() &Clipboard { mut cb := &Clipboard{ max_retries: 5 retry_delay: 5 } class_name := 'clipboard' wndclass := WndClassEx{ cb_size: sizeof(WndClassEx) lpfn_wnd_proc: voidptr(&C.DefWindowProc) lpsz_class_name: class_name.to_wide() lpsz_menu_name: 0 h_icon_sm: 0 } if C.RegisterClassEx(&wndclass) == 0 && C.GetLastError() != u32(C.ERROR_CLASS_ALREADY_EXISTS) { println('Failed registering class.') } hwnd := C.CreateWindowEx(0, wndclass.lpsz_class_name, wndclass.lpsz_class_name, 0, 0, 0, 0, 0, C.HWND_MESSAGE, C.NULL, C.NULL, C.NULL) if hwnd == C.NULL { println('Error creating window!') } cb.hwnd = hwnd return cb } fn (cb &Clipboard) check_availability() bool { return cb.hwnd != C.HWND(C.NULL) } fn (cb &Clipboard) has_ownership() bool { return C.GetClipboardOwner() == cb.hwnd } fn (mut cb Clipboard) clear() { if !cb.get_clipboard_lock() { return } C.EmptyClipboard() C.CloseClipboard() cb.foo = 0 } fn (mut cb Clipboard) free() { C.DestroyWindow(cb.hwnd) cb.foo = 0 } // the string.to_wide doesn't work with SetClipboardData, don't know why fn to_wide(text string) &C.HGLOBAL { len_required := C.MultiByteToWideChar(C.CP_UTF8, C.MB_ERR_INVALID_CHARS, text.str, text.len + 1, C.NULL, 0) buf := C.GlobalAlloc(C.GMEM_MOVEABLE, i64(sizeof(u16)) * len_required) if buf != C.HGLOBAL(C.NULL) { mut locked := &u16(C.GlobalLock(buf)) C.MultiByteToWideChar(C.CP_UTF8, C.MB_ERR_INVALID_CHARS, text.str, text.len + 1, locked, len_required) unsafe { locked[len_required - 1] = u16(0) } C.GlobalUnlock(buf) } return buf } fn (mut cb Clipboard) set_text(text string) bool { cb.foo = 0 buf := to_wide(text) if !cb.get_clipboard_lock() { C.GlobalFree(buf) return false } else { // EmptyClipboard must be called to properly update clipboard ownership C.EmptyClipboard() if C.SetClipboardData(C.CF_UNICODETEXT, buf) == C.HANDLE(C.NULL) { println('SetClipboardData: Failed.') C.CloseClipboard() C.GlobalFree(buf) return false } } // CloseClipboard appears to change the sequence number... C.CloseClipboard() return true } fn (mut cb Clipboard) get_text() string { cb.foo = 0 if !cb.get_clipboard_lock() { return '' } h_data := C.GetClipboardData(C.CF_UNICODETEXT) if h_data == C.HANDLE(C.NULL) { C.CloseClipboard() return '' } str := string_from_wide(&u16(C.GlobalLock(h_data))) C.GlobalUnlock(h_data) return str } pub fn new_primary() &Clipboard { panic('Primary clipboard is not supported on non-Linux systems.') }