使用PostMessage()或SendMessage()来发送大写字母。

Question

我试图使用PostMessage()函数发送大写字母或符号(！@#等)。

[DllImport("user32.dll")]
public static extern IntPtr PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

我试着同时发送shift和我想发送的大写字母，但似乎不起作用。

        public const uint WM_KEYUP = 0x0101;
        public const uint WM_KEYDOWN = 0x100;

        void function()
        {
            Keys key = Keys.A;
            Keys shift = Keys.ShiftKey;

            PostMessage(process.MainWindowHandle, WM_KEYDOWN, (IntPtr)shift, IntPtr.Zero);
            PostMessage(process.MainWindowHandle, WM_KEYDOWN, (IntPtr)key, IntPtr.Zero);
            PostMessage(process.MainWindowHandle, WM_KEYUP, (IntPtr)shift, IntPtr.Zero);
            PostMessage(process.MainWindowHandle, WM_KEYUP, (IntPtr)key, IntPtr.Zero);
        }

Answer 1

试试这个而不是使用WM_KEYDOWN和WM_KEYUP。

        public const uint WM_CHAR = 0x0102;

            ...

            PostMessage(process.MainWindowHandle, WM_CHAR, (IntPtr)'A', IntPtr.Zero);

完整的解决方案。创建一个C# Console App (我的是.NET Framework 4.7.2)

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace PostMessageTest
{
    class Program
    {
        [DllImport("user32.dll")]
        public static extern IntPtr PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
        public const uint WM_CHAR = 0x0102;

        public static void function()
        {
            IntPtr handle = Process.GetCurrentProcess().MainWindowHandle;
            Console.WriteLine("Sending Keys...");
            PostMessage(handle, WM_CHAR, (IntPtr)'A', IntPtr.Zero); // 0x41
        }

        static void Main(string[] args)
        {
            function();
            Console.Read();
        }
    }
}