1 files changed, 48 insertions, 0 deletions
diff --git a/redo/common_windows.go b/redo/common_windows.go
new file mode 100644
index 0000000..d2cae60
--- /dev/null
+++ b/redo/common_windows.go
@@ -0,0 +1,48 @@
+// 12 july 2014
+
+package ui
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+// TODO get rid of this when we actually use s_POINT somewhere
+var dummyToFoolwinconstgen s_POINT
+
+func getWindowText(hwnd uintptr) string {
+	// WM_GETTEXTLENGTH and WM_GETTEXT return the count /without/ the terminating null character
+	// but WM_GETTEXT expects the buffer size handed to it to /include/ the terminating null character
+	n := f_SendMessageW(hwnd, c_WM_GETTEXTLENGTH, 0, 0)
+	buf := make([]uint16, int(n + 1))
+	if f_SendMessageW(hwnd, c_WM_GETTEXT,
+		t_WPARAM(n + 1), t_LPARAM(uintptr(unsafe.Pointer(&buf[0])))) != n {
+		panic(fmt.Errorf("WM_GETTEXT did not copy exactly %d characters out", n))
+	}
+	return syscall.UTF16ToString(buf)
+}
+
+func setWindowText(hwnd uintptr, text string, errors []t_LRESULT) {
+	res := f_SendMessageW(hwnd, c_WM_SETTEXT,
+		0, t_LPARAM(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text)))))
+	for _, err := range errors {
+		if res == err {
+			panic(fmt.Errorf("WM_SETTEXT failed; error code %d", res))
+		}
+	}
+}
+
+func updateWindow(hwnd uintptr, caller string) {
+	res, err := f_UpdateWindow(hwnd)
+	if res == 0 {
+		panic(fmt.Errorf("error calling UpdateWindow() from %s: %v", caller, err))
+	}
+}
+
+func storelpParam(hwnd uintptr, lParam t_LPARAM) {
+	var cs *s_CREATESTRUCTW
+
+	cs = (*s_CREATESTRUCTW)(unsafe.Pointer(uintptr(lParam)))
+	f_SetWindowLongPtrW(hwnd, c_GWLP_USERDATA, cs.lpCreateParams)
+}