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Why isn't my GetProcessID function compiling in VS?

By : Alex Camargo
Date : September 15 2020, 05:00 PM
help you fix your problem The failing project is compiled as Unicode. When you do that, strings in PROCESSENTRY32 are defined as WCHAR [] rather than char [].
One solution would be to explicitly code PROCESSENTRY32A (and Process32FirstA / Process32NextA), although Unicode strings are better able to represent non-ASCII characters.
code :

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Alternative to GetProcessID for Windows 2000

By : RichK
Date : March 29 2020, 07:55 AM
This might help you There is an 'sort-of-unsupported' function: ZwQueryInformationProcess(): see

GetProcessId failed with error 6: The handle is invalid

By : Sufiyan Patel
Date : March 29 2020, 07:55 AM
this one helps. GetProcessID expects to be passed a valid process handle, as is clearly stated in the MSDN documentation. You're calling it with NULL as the argument:
code :
if (!GetProcessId(NULL))

GetProcessId returning zero

By : Rajeev
Date : March 29 2020, 07:55 AM
this one helps. Note that GetProcessId accepts as input a process handle, not a window handle For the latter, you can use GetWindowThreadProcessId instead.
See GetWindowThreadProcessId

GetProcessID vs GetThreadID

By : David Oddoye
Date : March 29 2020, 07:55 AM
wish of those help Since you're on Windows, here's a what MSDN has to say:
Processes and Threads

GetProcessId returns parrent instead of needed

By : Increment
Date : March 29 2020, 07:55 AM
With these it helps Your Get Process ID function will return the first process with the matching executable filename. That is why it's returning the parent process, because it's the first one to match the string comparison. If you have 2 running processes with the same name this will happen. Not much you can do about that.
Also here is some slightly better code (using unicode)
code :
DWORD GetProcId(const wchar_t* targetProcess)
    DWORD procId = 0;
    HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (hSnap != INVALID_HANDLE_VALUE)
        PROCESSENTRY32 procEntry;
        procEntry.dwSize = sizeof(procEntry);
        if (Process32First(hSnap, &procEntry))
                if (!wcscmp(procEntry.szExeFile, targetProcess))
                    procId = procEntry.th32ProcessID;
            } while (Process32Next(hSnap, &procEntry));
    return procId;
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