> For the complete documentation index, see [llms.txt](https://nviasoft.gitbook.io/nviasoft-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nviasoft.gitbook.io/nviasoft-docs/documentation/c/3.-ezgem.md).

# 3. EZGem 기초 선언

### 3.1  네임스페이스 선언(Using 선언)

```csharp
using EZGemPlusCS;                            //EZGEM DLL을 사용하기 위한 참조
```

### 3.2 EZGEM DLL 변수 선언

```csharp
public partial class Form1 : Form
{
    //EZGEM DLL참조
    //m_gem. 입력시 모든 함수및 속성 사용가능
    //================================================
    public CEZGemPlusLib m_gem = new CEZGemPlusLib(); 
    //================================================

```

### 3.3 콜백함수 선언

장비가 켜질 때(Form\_Load), EZGemPlus 라이브러리에서 발생하는 각종 상태 변화와 호스트의 명령을              실시간으로 수신하기 위해 수신 함수를 등록하는 필수 초기화 과정입니다.

```csharp
private void Form1_Load(object sender, EventArgs e)
{
    // GEM 내부 이벤트를 받습니다.
    m_gem.OnEZGemEvent += new ON_EZGEM_EVENT(OnEventReceived);
    // HOST로부터 받은 메시지를 전달합니다. 
    m_gem.OnEZGemMsg += new ON_EZGEM_MSG(OnMsgReceived);
}
```


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