小编use*_*189的帖子

我正在寻找Javascript框架来创建世界地图,能够绘制不同颜色的不同颜色.谢谢!

为什么我在"BIO_flush(b64);"行中收到此警告消息"警告:未使用值计算" 我怎么能摆脱它呢？

unsigned char *my_base64(unsigned char *input, int length)
{
    BIO *bmem, *b64;
    BUF_MEM *bptr;

    b64 = BIO_new(BIO_f_base64());
    bmem = BIO_new(BIO_s_mem());
    b64 = BIO_push(b64, bmem);
    BIO_write(b64, input, length);
    BIO_flush(b64);
    BIO_get_mem_ptr(b64, &bptr);

    unsigned char *buff = (unsigned char *)malloc(bptr->length+1);
    memcpy(buff, bptr->data, bptr->length-1);
    buff[bptr->length-1] = 0;

    BIO_free_all(b64);

    return buff;
}