使用 ifstream 读取文件

发布于 2024-08-08 08:59:01 字数 777 浏览 1 评论 0原文

我正在尝试从文件中读取：该文件是多行的，基本上我需要检查每个“单词”。词是任何非空间的东西。

示例输入文件为：

示例文件：
测试二维
字3.5
输入
{

测试 13.5 12.3
另一个{
测试 145.4
}
}

我尝试了这样的事情：

ifstream inFile(fajl.c_str(), ifstream::in);

if(!inFile)
{
    cout << "Cannot open " << fajl << endl;
    exit(0);
}

string curr_str;
char curr_ch;
int curr_int;
float curr_float;

cout << "HERE\n";
inFile >> curr_str;

cout << "Read " << curr_str << endl;

问题是当它读取新行时它就会挂起。我在测试 13.5 之前阅读了所有内容但一旦到达该线，它就不会做任何事情。任何人都可以告诉我我做错了什么？关于如何做到这一点有更好的建议吗？？？

我基本上需要浏览文件并当时浏览一个“单词”（非白色字符）。我

谢谢

原文

I am trying to read from file:
The file is multiline and basically i need to go over each "word". Word being anything non space.

Sample input file would be:

Sample file:
test 2d
word 3.5
input
{
test 13.5 12.3
another {
testing 145.4
}
}

So I tried something like this:

ifstream inFile(fajl.c_str(), ifstream::in);

if(!inFile)
{
    cout << "Cannot open " << fajl << endl;
    exit(0);
}

string curr_str;
char curr_ch;
int curr_int;
float curr_float;

cout << "HERE\n";
inFile >> curr_str;

cout << "Read " << curr_str << endl;

The problem is when it reads new line it just hangs. I read everything before test 13.5
but once it reaches that line it doesnt do anything.
Anyone can tell me what I am doing wrong?
Any better suggestion on how to do this???

I essentially need to go through file and go one "word" (non white char) at the time.
I

Thanks

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今天小雨转甜 2024-08-15 08:59:01

您打开文件“inFile”但正在从“std::cin”读取任何特殊原因？

/*
 * Open the file.
 */
std::ifstream   inFile(fajl.c_str());   // use input file stream don't.
                                        // Then you don't need explicitly specify
                                        // that input flag in second parameter
if (!inFile)   // Test for error.
{
    std::cerr << "Error opening file:\n";
    exit(1);
}

std::string   word;
while(inFile >> word)  // while reading a word succeeds. Note >> operator with string
{                      // Will read 1 space separated word.
    std::cout << "Word(" << word << ")\n";
}

You open a file 'inFile' but are reading from the 'std::cin' any particular reason?

/*
 * Open the file.
 */
std::ifstream   inFile(fajl.c_str());   // use input file stream don't.
                                        // Then you don't need explicitly specify
                                        // that input flag in second parameter
if (!inFile)   // Test for error.
{
    std::cerr << "Error opening file:\n";
    exit(1);
}

std::string   word;
while(inFile >> word)  // while reading a word succeeds. Note >> operator with string
{                      // Will read 1 space separated word.
    std::cout << "Word(" << word << ")\n";
}

回复收藏 0 原文

早乙女 2024-08-15 08:59:01

不确定这在 iostream 库的“精神”中如何，但您可以使用未格式化的输入来做到这一点。比如：

char tempCharacter;
std::string currentWord;
while (file.get(tempCharacter))
{
    if (tempCharacter == '\t' || tempCharacter == '\n' || tempCharacter == '\r' || tempCharacter == ' ')
    {
        std::cout << "Current Word: " << currentWord << std::endl;
        currentWord.clear();
        continue;
    }
    currentWord.push_back(tempCharacter);
}

这有效吗？

Not sure how "in the spirit" of the iostream library this is, but you could do it with unformatted input. Something like:

char tempCharacter;
std::string currentWord;
while (file.get(tempCharacter))
{
    if (tempCharacter == '\t' || tempCharacter == '\n' || tempCharacter == '\r' || tempCharacter == ' ')
    {
        std::cout << "Current Word: " << currentWord << std::endl;
        currentWord.clear();
        continue;
    }
    currentWord.push_back(tempCharacter);
}

Does that work?

回复收藏 0 原文

~没有更多了~