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I just want find a exes which have a command line parameter that matches.

Thanks in advance!
Not clear. If you mean to learn the rules for command-line parameters required by some application, it depends on that application. If it doesn't provide (prints on console, shows on help pages) the command-line parameters, you are out of luck.
nv3 8-Jul-13 3:49am
There is generally no way to find out which command line parameters a program takes, unless the program offers that information by itself, for example by printing a help text to the console.
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Solution 1

On Windows you can you the WMIC command to get this information;
C:\WMIC PROCESS get Caption,Commandline,Processid

And by calling that from C++ you can parse the output and read the information you want.

Something like this might work for you;

#include <fstream>
#include <iostream>
#include <string>
#include <sstream>
#include <string>
#include <vector>
#include <istream>
#include <ostream>
#include <sstream>

#include <stdio.h>

using namespace std;

class process_info {
    const string name;
    const int id;
    const string command_line;

    process_info(const string& name, const int id, const string command_line)
        : name(name), id(id), command_line(command_line) {

int to_int(const string& value) {
    int i;
    istringstream ss(value);
    ss >> i;
    return i;

string trim(const string& str, const char trim_char) {
    string::size_type start = str.find_first_not_of(trim_char);
    string::size_type end = str.find_last_not_of(trim_char);

    if (start == end)
        return "";

    string temp = str.substr(0, end + 1);

    return temp.substr(start, temp.size());

string trim_whitespace(const string& str) {
    return trim(trim(trim(trim(str, ' '), '\t'), '\r'), '\n');

string run_command(const char* cmd) {
    FILE* pipe = _popen(cmd, "r");
    if (!pipe)
        return "ERROR";

    static const int buffer_size = 2048;
    char buffer[buffer_size];
    string result = "";
    while(!feof(pipe)) {
        if(fgets(buffer, buffer_size, pipe) != NULL)
            result += buffer;
    return result;

int main(int argc, char* argv[]) {
    const string result = run_command("WMIC PROCESS get Caption,Commandline,Processid");
    stringstream str(result);

    string line;
    vector<process_info> processes;

    if (getline(str, line, '\r')) {
        const string::size_type cl_pos = line.find("CommandLine", 0);
        const string::size_type pid_pos = line.find("ProcessId", 0);

        while(getline(str, line, '\r')) {
            if (line.find_first_not_of('\n') != string::npos) {
                if (line.size() > 0) {
                    const string name = trim_whitespace(line.substr(0, cl_pos));
                    const string command_line = trim_whitespace(line.substr(cl_pos, pid_pos-cl_pos));
                    const string pid = trim_whitespace(line.substr(pid_pos, line.size() - pid_pos));

                    if (pid.size() > 0) {
                        const process_info info(name, to_int(pid), command_line);

    cout << "Dumping list of processes: " << endl;
    for(string::size_type i = 0; i < processes.size(); ++i) {
        cout << "[" << processes[i].id << "] " << processes[i].name << "; command line={" << processes[i].command_line << "}" << endl;

    return 0;

(apologies for the "manual" string parsing, I am assuming you'll use boost or something like that for your final version).

Hope this helps,
Fredrik Bornander
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Solution 3

If you want to see how a running executable was called (including its parameters) you can use Task Manager. I have Vista; other versions might have different details.

Right click on the Windows tool bar and select "Task Manager". Go to the Processes tab. Select View -> Select Columns. On this dialog, make sure that "Command Line" is selected, click OK. You should have the command line of all running apps displayed. If your process of interest does not show up, make sure you have the "show processes from all users" checkbox/button selected.

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