Engine 对象的 GetNumberOfPagesInImageFile 方法

HRESULT GetNumberOfPagesInImageFile(
  BSTR                    ImageFilePath,
  IImagePasswordCallback* PasswordCallback,
  int*                    Result
);

int GetNumberOfPagesInImageFile(
  string                 ImageFilePath,
  IImagePasswordCallback PasswordCallback
);

Function GetNumberOfPagesInImageFile( _
  ImageFilePath As String, _
  [PasswordCallback As IImagePasswordCallback = Nothing] _
) As Integer