循環buffer解決網絡通信中數據的不完整接收

 網絡通信中，數據的獲取有時候並不按照你的想法進行，想每一次獲取的都是完整的數據幀，但是得到的卻是殘缺的幀，一個完整的幀分成幾段獲取到，或者一次獲取幾個完整幀。如何取得我們要處理的完整的幀，使用循環buffer可以解決這個問題，分享給各位

[csharp] 
// 循環buffer實現數據的接收以及處理  
Byte[] receiveBuffer = new Byte[16];  // 數據接收緩區                     
Byte[] cycleBuffer = new Byte[1024];  // 用來保存數據  
Byte[] frameBuffer = new Byte[16];    // 從cycleBuffer中得到的幀   
Int32 receiveCount;                   // 接收到的數據數  
Int32 indexHead, indexTail;           // 頭指針，尾指針  
indexHead = indexTail = 0;              

            // 循環buffer實現數據的接收以及處理
            Byte[] receiveBuffer = new Byte[16];  // 數據接收緩區                  
            Byte[] cycleBuffer = new Byte[1024];  // 用來保存數據
            Byte[] frameBuffer = new Byte[16];    // 從cycleBuffer中得到的幀
            Int32 receiveCount;                   // 接收到的數據數
            Int32 indexHead, indexTail;           // 頭指針，尾指針
            indexHead = indexTail = 0;            
[csharp] 
// 將接收到的數據放到循環buffer中去  
for (int i = 0; i < receiveCount; i++) 
{ 
    indexTail++; 
    if (indexTail == cycleBuffer.Length) 
    { 
        indexTail = 0; 
    } 
    cycleBuffer[indexTail] = receiveBuffer[i]; 
} 

            // 將接收到的數據放到循環buffer中去
            for (int i = 0; i < receiveCount; i++)
            {
                indexTail++;
                if (indexTail == cycleBuffer.Length)
                {
                    indexTail = 0;
                }
                cycleBuffer[indexTail] = receiveBuffer[i];
            }
[csharp] 
// 開始在循環buffer中取幀--指定字串  
Int32 indexTemp = indexHead; 
while (indexTemp != indexTail) 
{ 
    if (cycleBuffer[indexTemp] == (Byte)'$')  // 找到幀  
    { 
        Int32 dec = 0; 
        while (indexHead != indexTemp) 
        { 
            frameBuffer[dec++] = cycleBuffer[indexHead]; 
            indexHead++; 
            if (indexHead == cycleBuffer.Length) 
            { 
                indexHead = 0; 
            } 
        } 
 
        // 處理取出來的一幀數據  
        ........................ 
    } 
    else 
    { 
        indexTemp++; 
        if (indexTemp == cycleBuffer.Length) 
        { 
            indexTemp = 0; 
        } 
    } 
} 

            // 開始在循環buffer中取幀--指定字串
            Int32 indexTemp = indexHead;
            while (indexTemp != indexTail)
            {
                if (cycleBuffer[indexTemp] == (Byte)'$')  // 找到幀
                {
                    Int32 dec = 0;
                    while (indexHead != indexTemp)
                    {
                        frameBuffer[dec++] = cycleBuffer[indexHead];
                        indexHead++;
                        if (indexHead == cycleBuffer.Length)
                        {
                            indexHead = 0;
                        }
                    }

                    // 處理取出來的一幀數據
                    ........................
                }
                else
                {
                    indexTemp++;
                    if (indexTemp == cycleBuffer.Length)
                    {
                        indexTemp = 0;
                    }
                }
            }