- 1 year ago
Is there any "modern" way to create ChildProcess with redirected stdin and stdout in c++?
Comment
1 / 1
Yes, in modern C++, you can use the <iostream>
and <string>
headers along with the <filesystem>
header to create child processes with redirected stdin and stdout. Here's an example using the <iostream>
and <string>
headers:
cpp#include <iostream>
#include <string>
#include <stdexcept>
#include <cstdlib>
int main() {
std::string command = "your_command_here";
std::string input = "your_input_here";
FILE* fp = nullptr;
char buffer[128];
try {
// Open the command as a child process
fp = _popen(command.c_str(), "w");
if (!fp) {
throw std::runtime_error("Failed to open child process.");
}
// Write the input to the child process's stdin
fwrite(input.c_str(), sizeof(char), input.length(), fp);
fflush(fp);
// Read the output from the child process's stdout
while (fgets(buffer, sizeof(buffer), fp) != nullptr) {
std::cout << buffer;
}
// Close the child process
if (_pclose(fp) == -1) {
throw std::runtime_error("Failed to close child process.");
}
} catch (const std::exception& e) {
std::cerr << "Error: " << e.what() << std::endl;
if (fp) {
_pclose(fp);
}
return 1;
}
return 0;
}
In this example, your_command_here
is the command you want to execute, and your_input_here
is the input you want to provide to the command's stdin. The output of the command will be printed to the console.
Note that _popen
and _pclose
are Microsoft-specific functions. For a more platform-independent solution, you can use the popen
and pclose
functions, which are part of the POSIX standard. Additionally, you may need to include the appropriate headers and use the correct namespace for your specific platform.