---
title: "FormatReader..::.CheckOpened Method "
canonical: https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_Codecs_FormatReader_CheckOpened.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# FormatReader.CheckOpened Method 
 
Checks if the format reader is opened.
 
**Namespace:** [Aurigma.GraphicsMill.Codecs](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_Codecs.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```
Protected Friend Overridable Sub CheckOpened
```
 
```csharp
protected internal virtual void CheckOpened()
```
 
## Remarks
  
This method is called whenever any reader property that is associated with an opened file (for example, dimensions or quality) is used. It is also called when the frame is loaded.
   
## See Also

### Reference

- [FormatReader Class](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Codecs_FormatReader.htm.md)
- [Aurigma.GraphicsMill.Codecs Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_Codecs.htm.md)
- [FormatReader.Opened](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_Codecs_FormatReader_Opened.htm.md)
- [FormatReader.LoadFrame(Int32)](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_Codecs_FormatReader_LoadFrame_1_e1836fc4.htm.md)