public static bool ComboBox_GetCueBannerText(HWND hwnd, out string lpwText, int cchText) 这个有测试过吗， 报内存访问限制

[icetech233]

用来读取， ComboBox 的编辑框的 文本

[icetech233]

comctl32.dll 系统这个报错了

[kkwpsv]

我这边测试没问题，贴下你的用法？

using Lsj.Util.Win32;
using Lsj.Util.Win32.BaseTypes;
using Lsj.Util.Win32.Enums;
using Lsj.Util.Win32.Macros;
using Lsj.Util.Win32.Marshals;
using Lsj.Util.Win32.NativeUI;
using Lsj.Util.Win32.NativeUI.Controls;
using System;
using System.Threading.Tasks;

namespace TestAppWin32
{
    internal class Program
    {
        static async Task Main(string[] args)
        {
            HWND comboxBoxHandle = IntPtr.Zero;
            var uiThreadManager = new UIThreadManager();
            await uiThreadManager.InvokeAsync(() =>
            {
                var win = new Win32Window();
                var comboBox = new ComboBox("text", 0, 0, 300, 20, (ComboBoxStyles)(int)WindowStyles.WS_CHILD, win.Handle);
                comboBox.Show();
                comboxBoxHandle = comboBox.Handle;

                StringHandle str = "TestCueBanner";
                var ret = User32.SendMessage(comboBox.Handle, (WindowMessages)ComboBoxControlMessages.CB_SETCUEBANNER, 0, str.Handle);
                Console.WriteLine($"CB_SETCUEBANNER ret: {ret}");

                win.Show();
            }
            );

            var ret = ComboBoxControlMacros.ComboBox_GetCueBannerText(comboxBoxHandle, out var str, 100);
            Console.WriteLine($"ComboBox_GetCueBannerText ret: {ret} result: {str}");

            await Task.Delay(-1);
        }
    }
}

PS: app.manifest 需要指定 Microsoft.Windows.Common-Controls 版本，CueBanner才有效果。

  <dependency>
    <dependentAssembly>
      <assemblyIdentity
          type="win32"
          name="Microsoft.Windows.Common-Controls"
          version="6.0.0.0"
          processorArchitecture="*"
          publicKeyToken="6595b64144ccf1df"
          language="*"
        />
    </dependentAssembly>
  </dependency>

[icetech233]

我这边测试没问题，贴下你的用法？

using Lsj.Util.Win32;
using Lsj.Util.Win32.BaseTypes;
using Lsj.Util.Win32.Enums;
using Lsj.Util.Win32.Macros;
using Lsj.Util.Win32.Marshals;
using Lsj.Util.Win32.NativeUI;
using Lsj.Util.Win32.NativeUI.Controls;
using System;
using System.Threading.Tasks;

namespace TestAppWin32
{
    internal class Program
    {
        static async Task Main(string[] args)
        {
            HWND comboxBoxHandle = IntPtr.Zero;
            var uiThreadManager = new UIThreadManager();
            await uiThreadManager.InvokeAsync(() =>
            {
                var win = new Win32Window();
                var comboBox = new ComboBox("text", 0, 0, 300, 20, (ComboBoxStyles)(int)WindowStyles.WS_CHILD, win.Handle);
                comboBox.Show();
                comboxBoxHandle = comboBox.Handle;

                StringHandle str = "TestCueBanner";
                var ret = User32.SendMessage(comboBox.Handle, (WindowMessages)ComboBoxControlMessages.CB_SETCUEBANNER, 0, str.Handle);
                Console.WriteLine($"CB_SETCUEBANNER ret: {ret}");

                win.Show();
            }
            );

            var ret = ComboBoxControlMacros.ComboBox_GetCueBannerText(comboxBoxHandle, out var str, 100);
            Console.WriteLine($"ComboBox_GetCueBannerText ret: {ret} result: {str}");

            await Task.Delay(-1);
        }
    }
}

PS: app.manifest 需要指定 Microsoft.Windows.Common-Controls 版本，CueBanner才有效果。

  <dependency>
    <dependentAssembly>
      <assemblyIdentity
          type="win32"
          name="Microsoft.Windows.Common-Controls"
          version="6.0.0.0"
          processorArchitecture="*"
          publicKeyToken="6595b64144ccf1df"
          language="*"
        />
    </dependentAssembly>
  </dependency>

你电脑里面有没有这个文件

comctl32.dll