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                # 8.4 向evbuffer添加數據 ```cpp int evbuffer_add(struct evbuffer *buf, const void *data, size_t datlen); //這個函數添加 data 處的 datalen 字節到 buf 的末尾, //成功時返回0,失敗時返回-1。 ``` ```cpp int evbuffer_add_printf(struct evbuffer *buf, const char *fmt, ...) int evbuffer_add_vprintf(struct evbuffer *buf, const char *fmt, va_list ap); //這些函數添加格式化的數據到 buf 末尾。 //格式參數和其他參數的處理分別與 C 庫函數 printf 和 vprintf 相同。函數返回添加的字節數。 ``` ```cpp int evbuffer_expand(struct evbuffer *buf, size_t datlen); //這個函數修改緩沖區的最后一塊,或者添加一個新的塊, //使得緩沖區足以容納 datlen 字節, 而不需要更多的內存分配。 ``` ###示例 ```cpp /* Here are two ways to add "Hello world 2.0.1" to a buffer. */ /* Directly: */ evbuffer_add(buf, "Hello world 2.0.1", 17); /* Via printf: */ evbuffer_add_printf(buf, "Hello %s %d.%d.%d", "world", 2, 0, 1); ```
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