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我想为一些 IM 编写一个通信嗅探器,比如 ICQ 或 MSN。你能帮我如何开始吗?很难找到有用的信息如何做到这一点。我应该如何开始?我知道有适用于 Windows 的 winpcap 库,它对数据包嗅探很有用。