不懂C++,有一段代码不知道怎么转，PUCHAR转换

SDK_API	BOOL	__stdcall	OpenStream(int nPlayer, PUCHAR pHeaderBuf, int nSize);



typedef struct _FILE_HEADER

{

	DWORD	dwFLAGS;		//文件头标志字段

	DWORD	dwFrameWidth;		//帧宽

	DWORD	dwFrameHeight;		//帧高

	DWORD	dwTotalFrames;		//总帧数

	DWORD	dwVideoFormat;		//源视频格式：0表示PAL，1表示NTSC

	DWORD	bThrowFrame;		//是否抽帧：0表示不抽帧，1表示抽帧（互联网模式）

	DWORD	dwReserved1;		//保留字段

	DWORD	dwReserved2;		//保留字段

} FILE_HEADER, *PFILE_HEADER;



typedef struct

{

	//nType = nTypeLens & 0xFF, nLens = nTypeLens>>8，说明nType共占1个字节，nLens共占3个字节

	int		nTypeLens;

	//nFrame = nFrameIDR & 0xFFFF, nIDR=nFrameIDR>>16，说明nFrame占2个字节，nIDR占2个字节

	int		nFrameIDR;

	//nCurPack = nPackets & 0x00FF, nTotalPack = nPackets & 0xFF00，说明nTotalPack占1个字节，nCurPack占一个字节，暂空两个字节备用

	int		nPackets;	

	//净载数据

	unsigned char	acData[DATA_SIZE_LARGE];	



} SOCKET_DATA_LARGE, *PSOCKET_DATA_LARGE;

SOCKET_DATA_LARGE m_data_large;

//中间是获取数据代码

OpenStream(m_nChannel, m_data_large.acData, sizeof(FILE_HEADER));

[DllImport("SDK.dll", EntryPoint = "OpenStream")]

public static extern bool OpenStream(int nPlayer, byte[] pHeaderBuf, int nSize);