列出C ++目录中的所有文本文件 [英] List all text files in directory in C++

问题描述

我正在尝试将所有txt文件的名称存储在字符串目录中并打印出来.我需要计算目录中txt文件的数量，然后打印名称.计数的一部分正在起作用，但是我似乎无法使这个名字起作用.我找到了一些示例，但是它们在我正在使用的Visual Studio中不起作用.

I am trying to store the name of all txt files in a directory in a string and print them out. I need to count the number of txt files in the directory and then print the names. The part of counting is working, but I can't seem to get the name working. I have found some examples but they don't work in visual studio which is what I'm using.

这是我的代码.

int main() {

    bool x = true;
    int i = 0;

    wchar_t* file = L"../Menu/Circuitos/*.txt";
    WIN32_FIND_DATA FindFileData;

    HANDLE hFind;

    hFind = FindFirstFile(file, &FindFileData);

    if (hFind != INVALID_HANDLE_VALUE) {

        i++;

        while ((x = FindNextFile(hFind, &FindFileData)) == TRUE) {
            i++;
        }
    }

    cout << "number of files " << i << endl;

    return 0;
}

推荐答案

FindFirstFile已经具有第一个有效句柄.如果立即调用FindNextFile，则第一个句柄将丢失.您的示例中的文件计数将是错误的.

FindFirstFile already has the first valid handle. If you immediately call FindNextFile then the first handle is lost. The file count in your example would be wrong.

使用do-while循环代替.

此外，必须使用FindClose

HANDLE hFind;
hFind = FindFirstFile(file, &FindFileData);
if (hFind != INVALID_HANDLE_VALUE) 
{
    do {
        wcout << FindFileData.cFileName << "\n";
        i++;
    } while (FindNextFile(hFind, &FindFileData));
    FindClose(hFind);
}
cout << "number of files " << i << endl;

使用std::vector和std::wstring存储项目

#include <string>
#include <vector>

...
std::vector<std::wstring> vs;
HANDLE hFind;
hFind = FindFirstFile(file, &FindFileData);
if (hFind != INVALID_HANDLE_VALUE) 
{
    do {
        vs.push_back(FindFileData.cFileName);
    } while (FindNextFile(hFind, &FindFileData));
    FindClose(hFind);
}

std::cout << "count:" << vs.size() << "\n";
for (auto item : vs)
    std::wcout << item << "\n";

对于某些较旧的编译器auto可能不可用，请改用此

For some older compilers auto may not be available, use this instead

for (int i = 0; i < vs.size(); i++)
    std::wcout << vs[i] << "\n";

请注意，Windows API使用c字符串.在许多情况下，您必须使用.c_str()来获取字符数组.例如:

Note, Windows API works with c-strings. In many cases you have to use .c_str() to obtain character array. For example:

if (vs.size())
{
    std::wstring str = vs[0];
    MessageBox(0, str.c_str(), 0, 0);
}

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