From e9f25362bef2616b8074c1d6ec30a1afecf0c178 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Mon, 10 Feb 2014 12:44:11 -0500
Subject: Added combo boxes and added some to the main window example.

---
 common.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'common.go')

diff --git a/common.go b/common.go
index 4505397..a51583d 100644
--- a/common.go
+++ b/common.go
@@ -3,8 +3,11 @@ package main
 
 import (
 	"syscall"
+	"unsafe"
 )
 
+// TODO filter out commctrl.h stuff because the combobox stuff has values that differ between windows versions and bleh
+
 var (
 	user32 = syscall.NewLazyDLL("user32.dll")
 	kernel32 = syscall.NewLazyDLL("kernel32.dll")
@@ -37,7 +40,30 @@ func (w WPARAM) HIWORD() uint16 {
 	return uint16((w >> 16) & 0xFFFF)
 }
 
+func LPARAMFromString(str string) LPARAM {
+	return LPARAM(unsafe.Pointer(syscall.StringToUTF16Ptr(str)))
+}
+
 // microsoft's header files do this
 func MAKEINTRESOURCE(what uint16) uintptr {
 	return uintptr(what)
 }
+
+// TODO adorn error messages with which step failed?
+func getText(hwnd HWND) (text string, err error) {
+	var tc []uint16
+
+	length, err := SendMessage(hwnd, WM_GETTEXTLENGTH, 0, 0)
+	if err != nil {
+		return "", err
+	}
+	tc = make([]uint16, length + 1)
+	_, err = SendMessage(hwnd,
+		WM_GETTEXT,
+		WPARAM(length + 1),
+		LPARAM(unsafe.Pointer(&tc[0])))
+	if err != nil {
+		return "", err
+	}
+	return syscall.UTF16ToString(tc), nil
+}
-- 
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