c# - .Net Core - 复制到剪贴板？

Question

是否可以使用 .Net Core (以与平台无关的方式) 将内容复制到剪贴板？

似乎Clipboard类丢失，P/Invoking 不是 Windows 之外的选项。

<子>编辑:不幸的是，直到现在我的问题和人们在阅读问题时听到的内容之间存在差异。根据评论和答案，有两件事很清楚。首先，很少有人关心是否存在最真实的“象牙塔”平台不可知论。其次，当人们发布代码示例来展示您如何在不同平台上使用剪贴板时，技术上正确的答案(“no, it's not possible”)令人困惑。所以我划掉了附加条款。

Answer 1

我的这个项目 (https://github.com/SimonCropp/TextCopy) 使用了 PInvoke 和命令行调用的混合方法。目前支持

• 装有 .NET Framework 4.6.1 及更高版本的 Windows
• 使用 .NET Core 2.0 及更高版本的 Windows
• 装有 Mono 5.0 及更高版本的 Windows
• 带有 .NET Core 2.0 及更高版本的 OSX
• 带有 Mono 5.20.1 及更高版本的 OSX
• 带有 .NET Core 2.0 及更高版本的 Linux
• 装有 Mono 5.20.1 及更高版本的 Linux

用法:

Install-Package TextCopy

TextCopy.ClipboardService.SetText("Text to place in clipboard");

或者直接使用实际代码

window

https://github.com/CopyText/TextCopy/blob/master/src/TextCopy/WindowsClipboard.cs

static class WindowsClipboard
{
    public static void SetText(string text)
    {
        OpenClipboard();

        EmptyClipboard();
        IntPtr hGlobal = default;
        try
        {
            var bytes = (text.Length + 1) * 2;
            hGlobal = Marshal.AllocHGlobal(bytes);

            if (hGlobal == default)
            {
                ThrowWin32();
            }

            var target = GlobalLock(hGlobal);

            if (target == default)
            {
                ThrowWin32();
            }

            try
            {
                Marshal.Copy(text.ToCharArray(), 0, target, text.Length);
            }
            finally
            {
                GlobalUnlock(target);
            }

            if (SetClipboardData(cfUnicodeText, hGlobal) == default)
            {
                ThrowWin32();
            }

            hGlobal = default;
        }
        finally
        {
            if (hGlobal != default)
            {
                Marshal.FreeHGlobal(hGlobal);
            }

            CloseClipboard();
        }
    }

    public static void OpenClipboard()
    {
        var num = 10;
        while (true)
        {
            if (OpenClipboard(default))
            {
                break;
            }

            if (--num == 0)
            {
                ThrowWin32();
            }

            Thread.Sleep(100);
        }
    }

    const uint cfUnicodeText = 13;

    static void ThrowWin32()
    {
        throw new Win32Exception(Marshal.GetLastWin32Error());
    }

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

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool GlobalUnlock(IntPtr hMem);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool OpenClipboard(IntPtr hWndNewOwner);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool CloseClipboard();

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

    [DllImport("user32.dll")]
    static extern bool EmptyClipboard();
}

苹果操作系统

https://github.com/CopyText/TextCopy/blob/master/src/TextCopy/OsxClipboard.cs

static class OsxClipboard
{
    public static void SetText(string text)
    {
        var nsString = objc_getClass("NSString");
        IntPtr str = default;
        IntPtr dataType = default;
        try
        {
            str = objc_msgSend(objc_msgSend(nsString, sel_registerName("alloc")), sel_registerName("initWithUTF8String:"), text);
            dataType = objc_msgSend(objc_msgSend(nsString, sel_registerName("alloc")), sel_registerName("initWithUTF8String:"), NSPasteboardTypeString);

            var nsPasteboard = objc_getClass("NSPasteboard");
            var generalPasteboard = objc_msgSend(nsPasteboard, sel_registerName("generalPasteboard"));

            objc_msgSend(generalPasteboard, sel_registerName("clearContents"));
            objc_msgSend(generalPasteboard, sel_registerName("setString:forType:"), str, dataType);
        }
        finally
        {
            if (str != default)
            {
                objc_msgSend(str, sel_registerName("release"));
            }

            if (dataType != default)
            {
                objc_msgSend(dataType, sel_registerName("release"));
            }
        }
    }

    [DllImport("/System/Library/Frameworks/AppKit.framework/AppKit")]
    static extern IntPtr objc_getClass(string className);

    [DllImport("/System/Library/Frameworks/AppKit.framework/AppKit")]
    static extern IntPtr objc_msgSend(IntPtr receiver, IntPtr selector);

    [DllImport("/System/Library/Frameworks/AppKit.framework/AppKit")]
    static extern IntPtr objc_msgSend(IntPtr receiver, IntPtr selector, string arg1);

    [DllImport("/System/Library/Frameworks/AppKit.framework/AppKit")]
    static extern IntPtr objc_msgSend(IntPtr receiver, IntPtr selector, IntPtr arg1, IntPtr arg2);

    [DllImport("/System/Library/Frameworks/AppKit.framework/AppKit")]
    static extern IntPtr sel_registerName(string selectorName);

    const string NSPasteboardTypeString = "public.utf8-plain-text";
}

Linux

https://github.com/CopyText/TextCopy/blob/master/src/TextCopy/LinuxClipboard_2.1.cs

static class LinuxClipboard
{
    public static void SetText(string text)
    {
        var tempFileName = Path.GetTempFileName();
        File.WriteAllText(tempFileName, text);
        try
        {
            BashRunner.Run($"cat {tempFileName} | xclip");
        }
        finally
        {
            File.Delete(tempFileName);
        }
    }

    public static string GetText()
    {
        var tempFileName = Path.GetTempFileName();
        try
        {
            BashRunner.Run($"xclip -o > {tempFileName}");
            return File.ReadAllText(tempFileName);
        }
        finally
        {
            File.Delete(tempFileName);
        }
    }
}

static class BashRunner
{
    public static string Run(string commandLine)
    {
        var errorBuilder = new StringBuilder();
        var outputBuilder = new StringBuilder();
        var arguments = $"-c \"{commandLine}\"";
        using (var process = new Process
        {
            StartInfo = new ProcessStartInfo
            {
                FileName = "bash",
                Arguments = arguments,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                UseShellExecute = false,
                CreateNoWindow = false,
            }
        })
        {
            process.Start();
            process.OutputDataReceived += (sender, args) => { outputBuilder.AppendLine(args.Data); };
            process.BeginOutputReadLine();
            process.ErrorDataReceived += (sender, args) => { errorBuilder.AppendLine(args.Data); };
            process.BeginErrorReadLine();
            if (!process.WaitForExit(500))
            {
                var timeoutError = $@"Process timed out. Command line: bash {arguments}.
Output: {outputBuilder}
Error: {errorBuilder}";
                throw new Exception(timeoutError);
            }
            if (process.ExitCode == 0)
            {
                return outputBuilder.ToString();
            }

            var error = $@"Could not execute process. Command line: bash {arguments}.
Output: {outputBuilder}
Error: {errorBuilder}";
            throw new Exception(error);
        }
    }
}