diff options
Diffstat (limited to 'sysdata_windows.go')
| -rw-r--r-- | sysdata_windows.go | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/sysdata_windows.go b/sysdata_windows.go index b14161d..bf72ba5 100644 --- a/sysdata_windows.go +++ b/sysdata_windows.go @@ -31,6 +31,7 @@ type classData struct { selectedIndexMsg uintptr selectedIndexErr int addSpaceErr int + lenMsg uintptr } const controlstyle = _WS_CHILD | _WS_VISIBLE | _WS_TABSTOP @@ -65,6 +66,7 @@ var classTypes = [nctypes]*classData{ selectedIndexMsg: _CB_GETCURSEL, selectedIndexErr: _CB_ERR, addSpaceErr: _CB_ERRSPACE, + lenMsg: _CB_GETCOUNT, }, c_lineedit: &classData{ name: "EDIT", @@ -92,6 +94,7 @@ var classTypes = [nctypes]*classData{ selectedIndexMsg: _LB_GETCURSEL, selectedIndexErr: _LB_ERR, addSpaceErr: _LB_ERRSPACE, + lenMsg: _LB_GETCOUNT, }, c_progressbar: &classData{ name: _PROGRESS_CLASS, @@ -524,3 +527,23 @@ func (s *sysData) setProgress(percent int) { } <-ret } + +func (s *sysData) len() int { + ret := make(chan uiret) + defer close(ret) + uitask <- &uimsg{ + call: _sendMessage, + p: []uintptr{ + uintptr(s.hwnd), + uintptr(classTypes[s.ctype].lenMsg), + uintptr(_WPARAM(0)), + uintptr(_LPARAM(0)), + }, + ret: ret, + } + r := <-ret + if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) { + panic(fmt.Errorf("unexpected error return from sysData.len(); GetLastError() says %v", r.err)) + } + return int(r.ret) +} |