C# 实现对PPT文档加密、解密及重置密码的操作方法

using Spire.Presentation;
namespace Security_PPT
{
 class Program
 {
  static void Main(string[] args)
  {
   //新建一个Presentation类实例，并加载需要加密的文档
   Presentation presentation = new Presentation();
   presentation.LoadFromFile(@"C:\Users\Administrator\Desktop\test.pptx");  
   //加密文件，设置打开密码并保存文档
   presentation.Encrypt("test");
   presentation.SaveToFile("encrypt.pptx", FileFormat.Pptx2007);
  }
 }
}

using Spire.Presentation;
namespace ResetPassword_PPT
{
 class Program
 {
  static void Main(string[] args)
  {
   //创建一个Presentation类实例并加载已加密的文档
   Presentation presentation = new Presentation();
   presentation.LoadFromFile(@"C:\Users\Administrator\Desktop\encrypt.pptx", FileFormat.Pptx2010, "test");
   //解除原有密码，添加新密码
   presentation.RemoveEncryption();
   presentation.Protect("newtest");
   //保存文档
   presentation.SaveToFile("newresult.pptx", FileFormat.Pptx2010);
  }
 }
}