使用strcpy从“char”无效转换为“char *” [英] invalid conversion from 'char' to 'char*' using strcpy

问题描述

好的，这里是我遇到麻烦的代码部分：

Ok so here are the parts of my code that I'm having trouble with:

char * historyArray;
historyArray = new char [20];

//get input
cin.getline(readBuffer, 512);       
cout << readBuffer <<endl;

//save to history
for(int i = 20; i > 0; i--){
    strcpy(historyArray[i], historyArray[i-1]); //ERROR HERE//  
}

strcpy(historyArray[0], readBuffer); //and here but it's the same error//

我收到的错误是： / p>

The error that i'm receiving is:

"invalid conversion from 'char' to 'char*' 
           initializing argument 1 of 'char* strcpy(char*, const char*)'

该项目是创建一个psudo操作系统Shell，将捕获和处理中断我还要运行基本的unix命令我的问题是，我必须存储过去的20个命令到一个字符数组，动态分配在堆栈上（也解除分配）

The project is to create a psudo OS Shell that will catch and handle interrupts as well as run basic unix commands. The issue that I'm having is that I must store the past 20 commands into a character array that is dynamically allocated on the stack. (And also de-allocated)

当我只使用一个2d字符数组，上面的代码工作正常：

When I just use a 2d character array the above code works fine:

char historyArray[20][];

但问题是它不是动态的...

but the problem is that it's not dynamic...

是的，我知道strcpy应该用于复制字符串。

And yes I do know that strcpy is supposed to be used to copy strings.

任何帮助将非常感谢！ >

Any help would be greatly appreciated!

推荐答案

在C ++程序中停止使用C成语：

Stop using C idioms in a C++ program:

std::deque<std::string> historyArray;

//get input
std::string readBuffer;
std::getline(std::cin, readBuffer);       
std::cout << readBuffer << std::endl;

//save to history
historyArray.push_front(readBuffer);
if(historyArray.size() > 20)
  historyArray.pop_back();

因此，我们有：

• 在readBuffer / getline（）中没有缓冲区溢出威胁


• 任何地方没有指针可以混淆。


• 没有数组超过


• 任意长的输入字符串


• 经验证的内存分配语义

• No buffer-overflow threat in readBuffer / getline()
• No pointers, anywhere, to confuse us.
• No arrays to overstep the ends of
• Arbitrarily long input strings
• Trivially-proven memory allocation semantics

这篇关于使用strcpy从“char”无效转换为“char *”的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！