C#调用WinApi将字符串“abced”写入剪切板

你可以使用 Windows API 通过 C# 将字符串写入剪贴板。以下是一个示例代码：

using System.Runtime.InteropServices;

public class ClipboardHelper
{
    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool OpenClipboard(IntPtr hWndNewOwner);

    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool CloseClipboard();

    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool EmptyClipboard();

    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr SetClipboardData(uint uFormat, IntPtr hMem);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern IntPtr GlobalAlloc(uint uFlags, UIntPtr dwBytes);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern IntPtr GlobalLock(IntPtr hMem);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool GlobalUnlock(IntPtr hMem);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern UIntPtr GlobalSize(IntPtr hMem);

    private const uint CF_UNICODETEXT = 13;

    public static void SetText(string text)
    {
        if (!OpenClipboard(IntPtr.Zero))
        {
            throw new System.ComponentModel.Win32Exception();
        }

        try
        {
            // 清空剪贴板
            if (!EmptyClipboard())
            {
                throw new System.ComponentModel.Win32Exception();
            }

            // 分配全局内存，并锁定内存区域
            int byteCount = (text.Length + 1) * 2; // 两个字节表示一个 Unicode 字符
            IntPtr hGlobal = GlobalAlloc(0x2000, (UIntPtr)byteCount); // 0x2000 表示 GMEM_MOVEABLE
            if (hGlobal == IntPtr.Zero)
            {
                throw new System.ComponentModel.Win32Exception();
            }

            try
            {
                IntPtr lpMem = GlobalLock(hGlobal);
                if (lpMem == IntPtr.Zero)
                {
                    throw new System.ComponentModel.Win32Exception();
                }

                try
                {
                    // 将字符串复制到内存区域
                    byte[] bytes = System.Text.Encoding.Unicode.GetBytes(text);
                    Marshal.Copy(bytes, 0, lpMem, bytes.Length);

                    // 将内存区域设置为剪贴板数据
                    if (SetClipboardData(CF_UNICODETEXT, hGlobal) == IntPtr.Zero)
                    {
                        throw new System.ComponentModel.Win32Exception();
                    }

                    // 在 Unlock 前不要释放内存，因为 SetClipboardData 后剪贴板会接管内存的控制权
                }
                finally
                {
                    GlobalUnlock(lpMem);
                }
            }
            catch
            {
                GlobalFree(hGlobal);
                throw;
            }
        }
        finally
        {
            CloseClipboard();
        }
    }
}

在上述代码中，SetText() 方法使用 CF_UNICODETEXT 格式将字符串写入剪贴板。你可以调用 SetText("abced") 将字符串 "abced" 写入剪贴板。