如何获取指向缓​​冲区的指针以读取内容并检查剩余数据 [英] How to get pointer to buffer to read the contents and check the remaining data

问题描述

大家好，



我正在用c ++做一个应用程序，我需要使用指针来读取缓冲区的内容。我使用以下代码声明指向缓冲区的指针。

Hi All,

I am doing an application in c++ in which i need to use pointer to read the contents of the buffer. I used the following code to declare pointer to the buffer.

unsigned char *ptrToBuf = gchOBDReplyBuf;

缓冲区包含来自文本文件的数据。我的问题是如何使用指针读取此缓冲区的内容？每次我需要检查缓冲区剩余内容，因为我需要在完全读取缓冲区数据时退出。请帮助，因为我不熟悉指针的内容..



先谢谢

The buffer has the data from a text file in it. My question is how can i read the contents of this buffer using pointers? Also each time i need to check the buffer remaining contents as I need to exit when the buffer data have been fully read.Please help as I am not familiar with the contents of pointers..

Thanks in Advance

推荐答案

试试这个......让我知道。

try this...and let me know.

if (gchOBDReplyBuf) {
    // get length of file:
    gchOBDReplyBuf.seekg (0, gchOBDReplyBuf.end);
    int length = gchOBDReplyBuf.tellg();
    gchOBDReplyBuf.seekg (0, gchOBDReplyBuf.beg);

    char * buffer = new char [length];

    std::cout << "Reading " << length << " characters... ";
    // read data as a block:
    gchOBDReplyBuf.read (buffer,length);

    if (gchOBDReplyBuf)
      std::cout <<"all characters read successfully";
    else
      std::cout<< "error: only << gchOBDReplyBuf.gcount()<< could be read;
    gchOBDReplyBuf.close();

    // ...buffer contains the entire file...

    delete[] buffer;
  }
  return 0;
}

如果您收到任何错误，请退回。 ...

if u getting any error please revert back....

试试这个..

Try this..

#include <iostream.h>
main() {
	unsigned char gchOBDReplyBuf[]= "abcdefghijklmnopqrstuvwxyz";
	unsigned char *ptrToBuf = gchOBDReplyBuf;
	for ( int index = 0; index < 26; index++ ) {
		cout << char(*ptrToBuf+index);
	}
	cout << endl;
}

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