c#gdi+双缓冲_在C ++中缓冲意味着什么？

待我称王封你为后i 2022-12-06 15:38 194阅读 0赞

c\#gdi+双缓冲

"Buffer" is a generic term that refers to a block of [computer memory][] that serves as a temporary placeholder. You might encounter the term in your computer, which uses RAM as a buffer, or in video streaming where a section of the movie you are streaming downloads to your device to stay ahead of your viewing. Computer programmers use buffers as well.

“缓冲区”是一个通用术语，是指用作临时占位符的[计算机内存][computer memory]块。 您可能会在使用RAM作为缓冲区的计算机中或在视频流中遇到该术语，在该流中，您正在流传输的电影的一部分会下载到设备上，以保持观看前的状态。 计算机程序员也使用缓冲区。

## 编程中的数据缓冲区 **(** Data Buffers in Programming **)** ##

In [computer programming][], data can be placed in a software buffer before it is processed. Because writing data to a buffer is much faster than a direct operation, using a buffer while programming in C and C++ makes a lot of sense and speeds up the calculation process. Buffers come in handy when a difference exists between the rate data is received and the rate it is processed.

在[计算机编程中][computer programming] ，可以在处理数据之前将其放入软件缓冲区。 由于将数据写入缓冲区要比直接操作快得多，因此在使用C和C ++进行编程时使用缓冲区非常有意义，并可以加快计算过程。 当接收到的速率数据与处理的速率之间存在差异时，缓冲区将派上用场。

## 缓冲区与缓存 **(** Buffer vs. Cache **)** ##

A buffer is temporary storage of data that is on its way to other media or storage of data that can be modified non-sequentially before it is read sequentially. It attempts to reduce the difference between [input speed and output speed][]. A cache also acts as a buffer, but it stores data that is expected to be read several times to reduce the need to access slower storage.

缓冲区是正在向其他介质传输的数据的临时存储，或者是在顺序读取之前可以无顺序修改的数据的存储。 它试图减小[输入速度和输出速度][input speed and output speed]之间的差异。 高速缓存还充当缓冲区，但是它存储期望多次读取的数据，以减少访问速度较慢的存储的需求。

## 如何在C ++中创建缓冲区 **(** How to Create a Buffer in C++ **)** ##

Usually, when you open a file, a buffer is created. When you close the file, the buffer is flushed. When working in C++, you can create a buffer by allocating memory in this manner:

通常，当您打开文件时，会创建一个缓冲区。 当您关闭文件时，将刷新缓冲区。 在C ++中工作时，可以通过以下方式分配内存来创建缓冲区：

char* buffer = new char[

When you want to free up the memory allocated to a buffer, you do so like this:

当您想要释放分配给缓冲区的内存时，您可以这样做：

delete[ ]

Note: If your system is low on memory, the benefits of buffering suffer. At this point, you have to find a balance between the size of a buffer and the available memory of your computer.

注意：如果系统内存不足，则缓冲的好处会受到影响。 此时，您必须在缓冲区大小和计算机的可用内存之间找到平衡。

##   **(**   **)** ##

> 翻译自: [https://www.thoughtco.com/definition-of-buffer-p2-958030][https_www.thoughtco.com_definition-of-buffer-p2-958030]

c\#gdi+双缓冲

[computer memory]: https://www.thoughtco.com/history-of-computer-memory-1992372
[computer programming]: https://www.thoughtco.com/what-is-programming-958331
[input speed and output speed]: https://www.thoughtco.com/learn-about-input-and-output-958405
[https_www.thoughtco.com_definition-of-buffer-p2-958030]: https://www.thoughtco.com/definition-of-buffer-p2-958030