如何复制与X11到剪贴板？ [英] How to copy to clipboard with X11?

问题描述

使用OS X上的框架，我可以使用以下为PNG复制到剪贴板（在C - 很明显，我可以用NSPasteboard与可可）：

Using the frameworks on OS X, I can use the following to copy a PNG to the pasteboard (in C — obviously I could use NSPasteboard with Cocoa):

#include <ApplicationServices/ApplicationServices.h>

int copyThatThing(void)
{
    PasteboardRef clipboard;
    if (PasteboardCreate(kPasteboardClipboard, &clipboard) != noErr) {
    	return -1;
    }

    if (PasteboardClear(clipboard) != noErr) {
        CFRelease(clipboard);
        return -1;
    }

    size_t len;
    char *pngbuf = createMyPNGBuffer(&len); /* Defined somewhere else */
    if (pngbuf == NULL) {
    	CFRelease(clipboard);
    	return -1;
    }

    CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, pngbuf, 
    		                             len, kCFAllocatorNull);
    if (data == NULL) {
    	CFRelease(clipboard);
    	free(pngbuf);
    	return -1;
    }

    OSStatus err;
    err = PasteboardPutItemFlavor(clipboard, NULL, kUTTypePNG, data, 0);
    CFRelease(clipboard);
    CFRelease(data);
    free(pngbuf);

    return 0;
}

我感兴趣的移植此功能的Linux / * BSD平台。我怎样才能复制此用X？

I'm interested in porting this functionality to Linux/*BSD platforms. How can I replicate this using X?

推荐答案

去读一读 X选中，剪切缓冲区，杀戒指先天下之忧。 X11有一个相当独特的系统，没有其他人似乎已经被复制。

Go read X Selections, Cut Buffers, and Kill Rings before anything else. X11 has a rather unique system that nobody else seems to have copied.

一个古怪的是大多数其他系统不同：如果程序拥有的选择（剪贴板）消失了，所以没有选择。 我有一个选择（这恰好是一个图像）所以，当你的程序说，然后退出，没有人会能够从您请求图像的副本。为了有用，剪贴板所有者需要坚持围绕至少要到另一个程序需要的选择。

One oddity that is different from most other systems: if the program owning the selection (clipboard) goes away, so does the selection. So when your program says "I have a selection (which happens to be an image)" and then exits, nobody will be able to request a copy of that image from you. In order to be useful, the clipboard owner needs to stick around at least until another program takes the selection.

还在这里？下面是一个简短的程序，你想要做什么，使用PyGTK的（因为C是一种痛苦）。

Still here? Here's a short program that does what you want, using PyGTK (because C is a pain).

#!/usr/bin/env python
import gtk
import sys

count = 0
def handle_owner_change(clipboard, event):
    global count
    print 'clipboard.owner-change(%r, %r)' % (clipboard, event)
    count += 1
    if count > 1:
        sys.exit(0)

image = gtk.gdk.pixbuf_new_from_file(sys.argv[1])
clipboard = gtk.clipboard_get()
clipboard.connect('owner-change', handle_owner_change)
clipboard.set_image(image)
clipboard.store()
gtk.main()

引擎盖下会发生什么：

What happens under the hood:

• GDK加载图像。


• 的Gtk声称剪贴板选择的所有权。


• 的是，CLIPBOARD_MANAGER副本，并采取选择。 （有可能不是一个运行，所以这可能不会发生。）


• 当另一个程序从我们的选择请求数据，GTK处理到目标的转换和从图像数据的传输。


• 第一OWNER_CHANGE事件对应于我们取得所有权;等下一个对应于我们失去所有权，并退出。

• Gdk loads an image.
• Gtk claims ownership of the CLIPBOARD selection.
• Gtk requests that the CLIPBOARD_MANAGER copy and take the selection. (There might not be one running, so this might not happen.)
• When another program requests data from our selection, Gtk handles the conversion and transfer of data from the image to the target.
• The first OWNER_CHANGE event corresponds to us taking ownership; wait for the next one corresponding to us losing ownership, and exit.

如果剪贴板管理器正在运行，这个程序可能会立即退出。否则，它将等到另一个程序正在执行剪切/复制。

If a clipboard manager is running, this program may exit immediately. Otherwise, it will wait until "cut/copy" is performed in another program.

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