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[DllImport("shell32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SHMultiFileProperties(IDataObject pdtobj, int dwFlags); [DllImport("shell32.dll", CharSet = CharSet.Auto)] public static extern IntPtr ILCreateFromPath(string path); [DllImport("shell32.dll", CharSet = CharSet.None)] public static extern void ILFree(IntPtr pidl); [DllImport("shell32.dll", CharSet = CharSet.None)] public static extern int ILGetSize(IntPtr pidl); private static MemoryStream CreateShellIDList(System.Collections.Specialized.StringCollection filenames) { // first convert all files into pidls list int pos = 0; byte[][] pidls = new byte[filenames.Count][]; foreach (Object filename in filenames) { // Get pidl based on name IntPtr pidl = ILCreateFromPath(filename.ToString()); int pidlSize = ILGetSize(pidl); // Copy over to our managed array pidls[pos] = new byte[pidlSize]; Marshal.Copy(pidl, pidls[pos++], 0, pidlSize); ILFree(pidl); } // Determine where in CIDL we will start pumping PIDLs int pidlOffset = 4 * (filenames.Count + 2); // Start the CIDL stream MemoryStream memStream = new MemoryStream(); BinaryWriter sw = new BinaryWriter(memStream); // Initialize CIDL witha count of files sw.Write(filenames.Count); // Calcualte and write relative offsets of every pidl starting with root sw.Write(pidlOffset); pidlOffset += 4; // root is 4 bytes foreach (byte[] pidl in pidls) { sw.Write(pidlOffset); pidlOffset += pidl.Length; } // Write the root pidl (0) followed by all pidls sw.Write(0); foreach (byte[] pidl in pidls) sw.Write(pidl); // stream now contains the CIDL return memStream; } //调用: string[] strArr = new string[] { @"C:\Lee", @"c:\windows" }; System.Collections.Specialized.StringCollection coll = new System.Collections.Specialized.StringCollection(); coll.AddRange(strArr); DataObject data = new DataObject(); data.SetData("Preferred DropEffect", true, new MemoryStream(new byte[] { 5, 0, 0, 0 })); data.SetData("Shell IDList Array", true, CreateShellIDList(coll)); data.SetFileDropList(coll); SHMultiFileProperties(data, 0); |
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