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HTTPCli_sendRequestBody，这个函数里定义的长度类型为int,文档也没有详细描述，但是我试了下，这个函数最多只能传3000多个字节，而我的图片有30多K,
可能是因为buffer不够。发送图片的话，可以把图片读进buffer里面然后用HTTPCli_sendRequestBody()发送。
文件读取的例程请参考 file_operation example ：imagelen = sl_FsRead(FileHdl, 0 , buf, sizeof(buf));HTTPCli_sendRequestBody(httpClient, buf, imagelen);如果内存限制导致buffer不够，可以多次调用HTTPCli_sendRequestBody()offset = 0;bytesRead = sl_FsRead(FileHdl, offset , buf, 1024);while(bytesRead>0){HTTPCli_sendRequestBody(httpClient, buf, bytesRead );bytesRead = sl_FsRead(FileHdl, (offset+bytesread) , buf, 1024);}
