C++ 循环队列实现缓冲类

     好久没有写博客了，前段时间做项目需要一个缓冲机制用来缓存视频帧。下面是自己实现的视频缓冲类。在此类中用循环队列实现了视频帧数据的入队、出队。在类中使用互斥对象避免出入队出现错误。下面是代码。

 /*****************头文件****************/

using namespace std;

#define  MAXSIZE  50

typedef struct
{
	int iSize;//数据的大小
	char *cdata;	
}bufData;
typedef struct 
{
	bufData mdata[MAXSIZE];
	int iRead;//队头
	int iWrite;//队尾
}bufferPara;

class CycleBuffer
{
public:
	CycleBuffer(void);
	~CycleBuffer(void);
	
	BOOL push(bufferPara *Q,char* src,int strLen);//缓冲区存入

	char* pop(bufferPara *Q,long &dsLen);//弹出数据

	BOOL InitQueue(bufferPara *Q);//初始化队列
	bufferPara  mbufferPara;
	char *dest;
private:
	
	HANDLE mutexHandle;
	char *item;

};

/**************************实现*******************/

#include "StdAfx.h"
#include "CycleBuffer.h"

CycleBuffer::CycleBuffer(void)
{
	InitQueue(&mbufferPara);
	dest = new char[1024*500];
	memset(dest,0,1024*500);
	mutexHandle = CreateMutex(NULL,FALSE,NULL );	
}

CycleBuffer::~CycleBuffer(void)
{	
	CloseHandle(mutexHandle);
	for (int i=0;i<MAXSIZE;i++)
	{
		delete[] mbufferPara.mdata[i].cdata;
	}
}

BOOL CycleBuffer::push(bufferPara *Q,char* src,int srcLen)
{
	WaitForSingleObject(mutexHandle,INFINITE);
	if ((Q->iWrite+1)%MAXSIZE!=Q->iRead)
	{
		memcpy(Q->mdata[Q->iWrite].cdata,src,srcLen);
		//Q->mdata[Q->iWrite].cdata = src;
		Q->mdata[Q->iWrite].iSize = srcLen;
		Q->iWrite = (Q->iWrite+1)%MAXSIZE;	
		ReleaseMutex(mutexHandle);
		return TRUE;
	}
	else
	{
		ReleaseMutex(mutexHandle);
		return FALSE;
	}	

}
char* CycleBuffer::pop(bufferPara *Q,long &dstLen)
{
	WaitForSingleObject(mutexHandle,INFINITE);
		
	if (Q->iRead!=Q->iWrite)
	{
		dest = Q->mdata[Q->iRead].cdata;	
		dstLen = Q->mdata[Q->iRead].iSize; 
		memcpy(dest,Q->mdata[Q->iRead].cdata,dstLen);
		Q->iRead = (Q->iRead+1)%MAXSIZE;
		ReleaseMutex(mutexHandle);
		return dest;		
	}
	else
	{
		ReleaseMutex(mutexHandle);
		return NULL;		
	}
	
}  
BOOL CycleBuffer::InitQueue(bufferPara * Q)
{
	Q->iRead =0;
	Q->iWrite=0;
	for (int i=0;i<MAXSIZE;i++)
	{
		Q->mdata[i].cdata = new char[1024*500];
		memset(Q->mdata[i].cdata,0,1024*500);
		Q->mdata[i].iSize = 0;
	}	
	return TRUE;
}

　　

      注意头文件中的两个结构体，结构体bufferPara定义的是基本的队列的结构，bufferData结构体中定义的是要存入队列的数据。此类还不完善，日后有时间完善再上传。请各位大牛们提出宝贵意见。