Check that file exists: Difference between revisions
New post using C++17 syntax. An existing post using an external library, boost, was retained.
(Removed post, for the time being, because it requires more work to fully complete the task.) |
(New post using C++17 syntax. An existing post using an external library, boost, was retained.) |
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testfile("/docs");
}</syntaxhighlight>
===Using C++ 17===
C++ 17 contains a Filesystem library which significantly improves manipulations with files.
<syntaxhighlight lang="c++">
#include <iostream>
#include <filesystem>
void file_exists(const std::filesystem::path& path) {
std::cout << path;
if ( std::filesystem::exists(path) ) {
if ( std::filesystem::is_directory(path) ) {
std::cout << " is a directory" << std::endl;
} else {
std::cout << " exists with a file size of " << std::filesystem::file_size(path) << " bytes." << std::endl;
}
} else {
std::cout << " does not exist" << std::endl;
}
}
int main() {
file_exists("C:/input.txt");
file_exists("C:/zero_length.txt");
file_exists("C:/docs/input2.txt");
file_exists("C:/docs/zero_length2.txt");
}
</syntaxhighlight>
{{ out }}
</pre>
"C:/input.txt" exists with a file size of 11 bytes.
"C:/zero_length.txt" exists with a file size of 0 bytes.
"C:/docs/input2.txt" exists with a file size of 11 bytes.
"C:/docs/zero_length2.txt" exists with a file size of 0 bytes.
</pre>
=={{header|Clojure}}==
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