xul/xpcom将图像从字符串复制到剪贴板

xul/xpcom copy image from string to clipboard

本文关键字：字符串 复制 剪贴板 图像 xpcom xul      更新时间：2023-09-26

我一直不知道如何将图像复制到剪贴板。我的代码如下：

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);

正如Neil在新闻组中所指出的，图像所需的数据是nsIContainer实例，而不是流。我在网上找不到任何这样做的例子，所以我修改了你的代码：

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，这将正确地将图像复制到剪贴板。

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