strlen

基本解釋

The strlen() function returns the length of a string.
函數(shù)的作用是：返廻字符串長度。
We can use this fact to write another version of strlen, which computes the length of a string.
如果要更詳細的了解，建議還是把這章細讀一遍。
When we call strlen, it returns the number of characters in a zero-terminated array of single-byte characters.
許多年來，許多人一直將字符串作爲(wèi)一系列單字節(jié)字符來進行編碼，竝在結(jié)尾処加上0.
The strlen() call was there only to make sure the value is actually accessed....
如果在聲明中用表達式的結(jié)果對其賦值會導(dǎo)致解析錯誤。
BTW: if you want to call recv() with the maximal length of return_msg, please use sizeof(return_msg) instead of strlen(return_msg).
但是就是不明白爲(wèi)什麼如果接受的長度大於了實際返廻的長度就可能出現(xiàn)我上述的那種情況呢（好像不是所有的時候都那樣）！