/// <summary> /// 判断文件格式 /// http://www.cnblogs.com/babycool /// </summary> /// <param name="filePath"></param> /// <returns></returns> public static bool IsAllowedExtension(string filePath) { FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read); BinaryReader reader = new BinaryReader(stream); string fileclass = ""; // byte buffer; try { //buffer = reader.ReadByte(); //fileclass = buffer.ToString(); //buffer = reader.ReadByte(); //fileclass += buffer.ToString(); for (int i = 0; i < 2; i++) { fileclass += reader.ReadByte().ToString(); } } catch (Exception) { throw; } if (fileclass == "255216") { return true; } else { return false; } /*文件扩展名说明 * 255216 jpg * 208207 doc xls ppt wps * 8075 docx pptx xlsx zip * 5150 txt * 8297 rar * 7790 exe * 3780 pdf * * 4946/104116 txt * 7173 gif * 255216 jpg * 13780 png * 6677 bmp * 239187 txt,aspx,asp,sql * 208207 xls.doc.ppt * 6063 xml * 6033 htm,html * 4742 js * 8075 xlsx,zip,pptx,mmap,zip * 8297 rar * 01 accdb,mdb * 7790 exe,dll * 5666 psd * 255254 rdp * 10056 bt种子 * 64101 bat * 4059 sgf */ }
时间: 2024-11-06 11:17:22