How to Get the Process Name in C++

How to get current process name in linux?

It's either pointed to by the argv[0] or indeed you can read /proc/self/status. Or you can use getenv("_"), not sure who sets that and how reliable it is.

using C -programming, how to get process name from process id on windows

Do you mean 'get the .exe filename by process ID' from C code?

If so, you may have interesting in OpenProcess() and following GetModuleFileNameEx().
Don't forget to CloseHandle() after you get the exe filename. :)

How to get the process name based on hwnd in C

The return value of GetWindowThreadProcessId() is a thread ID, not a process ID, so DO NOT assign that return value to your process_ID variable, or else it will overwrite the value that was output by the lpdwProcessId parameter.

HWND hwnd = GetForegroundWindow();

DWORD process_ID = 0;
if (GetWindowThreadProcessId(hwnd, &process_ID))
{
    // get the process name ...
}
else
{
    // error handling ...
}

Once you have the process ID, you can pass it to OpenProcess() to get a HANDLE to the running process, and then use that HANDLE with either GetModuleFileNameEx(), GetProcessImageFileName() (XP+), or QueryFullProcessImageName() (Vista+) to get the full path and filename of that process's EXE file:

HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, process_ID);
if (hProcess)
{
    WCHAR process_name[MAX_PATH] = {};
    if (GetModuleFileNameExW(hProcess, NULL, process_name, MAX_PATH))
    {
        // use process_name as needed...
    }
    else
    {
        // error handling ...
    }

    CloseHandle(hProcess);
}
else
{
    // error handling ...
}

HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_ID);
if (hProcess)
{
    WCHAR process_name[MAX_PATH] = {};
    if (GetProcessImageFileNameW(hProcess, process_name, MAX_PATH))
    {
        // use process_name as needed...
    }
    else
    {
        // error handling ...
    }

    CloseHandle(hProcess);
}
else
{
    // error handling ...
}

HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_ID);
if (hProcess)
{
    WCHAR process_name[MAX_PATH] = {};
    DWORD size = MAX_PATH;
    if (QueryFullProcessImageNameW(hProcess, 0, process_name, &size))
    {
        // use process_name as needed...
    }
    else
    {
        // error handling ...
    }

    CloseHandle(hProcess);
}
else
{
    // error handling ...
}

how to get the process name from the PID in C++?

it depends on the used platform like Yahia mentioned in his comment.

on linux: you can get the command-line by reading that file: /proc/[PID]/cmdline

on windows: I've found this: get process name from process id (win32)

How to get Process name from process id in windows through C++ without enumerating process?

I need to get process name from process id in windows to find process names associated with a logged event.

If you are getting the Process ID from a log, it will only be valid if the original process is still running. Otherwise, the ID is no longer valid for that process name. If the process has already exited before you read the log, all bets are off.

I need not currently running process since it talks about logged event.

Then you are out of luck, if the original process name was not logged.

I have a doubt of whether processID vs processName combination is unique or not in Windows.

A Process ID is unique only while being used for a running process. Once a process ends, its Process ID is no longer valid, and can be re-used for a subsequent new process.

I expect that there must be some structure to map process id to process name.

Yes, but only for a running process. You can pass the Process ID to OpenProcess(). If successful, it will return a HANDLE to the running process. You can then pass that HANDLE to GetModuleFileName(), GetProcessImageFileName(), or QueryFullProcessImageName(), depending on OS version and permissions you are able to gain from OpenProcess().

How do I get the name of the current executable in C#?

System.AppDomain.CurrentDomain.FriendlyName

get a process id from process name

Because there might be several instances of a process name running, there is no one-to-one correlation between a process's image name and a PID. You'll have to enumerate the processes and check the base module names for each one as Burgos describes, by using EnumProcesses.

FWIW, .Net approaches this problem by providing the GetProcessesByName API, which returns a collection of process objects. Not much use to you of course :-(

Get Parent Process Name (Windows)

Call OpenProcess with additional PROCESS_VM_READ flag and it should work:

h = OpenProcess
    (
    PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
    FALSE,
    pid
    );

Also look at the possible duplicate mentioned by Mekap

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