javascript - xul/xpcom将图像从字符串复制到剪贴板

我不知道如何将图像复制到剪贴板。
我的代码如下所示：

var image = "data:image/png;base64,..."

var io         = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
var channel    = io.newChannel(image, null, null);
var input      = channel.open();

var trans = Components.classes["@mozilla.org/widget/transferable;1"].createInstance(Components.interfaces.nsITransferable);
trans.addDataFlavor("image/png");
trans.setTransferData("image/png", input, input.available());

var clipid = Components.interfaces.nsIClipboard;
var clip   = Components.classes["@mozilla.org/widget/clipboard;1"].getService(clipid);
clip.setData(trans, null, clipid.kGlobalClipboard);

最佳答案

正如尼尔在新闻组中已经指出的那样，图像的预期数据是nsIContainer实例，而不是流。我在网上找不到任何这样做的例子，所以我修改了您的代码：

var image = "data:image/png;base64,...";

var io         = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
var channel    = io.newChannel(image, null, null);
var input      = channel.open();
var imgTools   = Components.classes["@mozilla.org/image/tools;1"].getService(Components.interfaces.imgITools);

var container  = {};
imgTools.decodeImageData(input, channel.contentType, container);

var trans = Components.classes["@mozilla.org/widget/transferable;1"].createInstance(Components.interfaces.nsITransferable);
trans.addDataFlavor("image/png");
trans.setTransferData("image/png", container.value, -1);

var clipid = Components.interfaces.nsIClipboard;
var clip   = Components.classes["@mozilla.org/widget/clipboard;1"].getService(clipid);
clip.setData(trans, null, clipid.kGlobalClipboard);

对我来说，这将图像正确复制到剪贴板。

关于javascript - xul/xpcom将图像从字符串复制到剪贴板，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6365550/