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                ## setvbuf ## 設置文件流的緩沖區 ### 相關函數 ### setbuffer,setlinebuf,setbuf ### 表頭文件 ### ``` #include<stdio.h> ``` ### 定義函數 ### ``` int setvbuf(FILE *stream, char *buf, int mode, size_t size); ``` ### 函數說明 ### 在打開文件流后,讀取內容之前,調用setvbuf()可以用來設置文件流的緩沖區。參數stream為指定的文件流,參數buf指向自定的緩沖區起始地址,參數size為緩沖區大小,參數mode有下列幾種 _IONBF 無緩沖IO _IOLBF 以換行為依據的無緩沖IO _IOFBF 完全無緩沖IO。如果參數buf為NULL指針,則為無緩沖IO。
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