Get Process Handle From Process ID

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I am trying to set the priority of all instances of an application such as Excel.exe to below normal. When I do this with wscript, it's very slow. I can do it for an open excel by running

MIDL

SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS );

How can I generalize it below?

C#

char * pProcessName="Excel.exe";
if (hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)) == INVALID_HANDLE_VALUE)
     ;
else {
    proc32.dwSize=sizeof(PROCESSENTRY32);
    while((Process32Next(hSnap, &proc32)) == TRUE) {
        if(_stricmp(proc32.szExeFile, pProcessName) == 0) {
            HANDLE h=OpenProcess(PROCESS_ALL_ACCESS, TRUE, proc32.th32ProcessID); //this line is incorrect I think
            SetPriorityClass(h, BELOW_NORMAL_PRIORITY_CLASS );
            CloseHandle(h);
        }
    }
    CloseHandle(hSnap);
}

Posted 9-Sep-10 20:49pm

T2102

Updated 11-Jan-18 3:00am

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Eugen Podsypalnikov · Answer 1 · 2010-09-09T22:52:00

Solution 1

You could try to use PROCESS_SET_INFORMATION as the first parameter... :)

Posted 9-Sep-10 22:52pm

Eugen Podsypalnikov

Comments

T2102 10-Sep-10 5:02am

Thanks, that solved my problem

Michael Haephrati · Answer 2 · 2018-01-11T03:00:00

Here is a complete solution. The function will be called as

SetProcessProirity(L"excel.exe",BELOW_NORMAL_PRIORITY_CLASS)

Here is the function I created:

void SetProcessProirity(LPWSTR ProcessName, int Priority)
{
    PROCESSENTRY32 proc32;
    HANDLE hSnap;
    if (hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
    if (hSnap == INVALID_HANDLE_VALUE)
    {

    }
    else
    {
        proc32.dwSize = sizeof(PROCESSENTRY32);
        while ((Process32Next(hSnap, &proc32)) == TRUE)
        {
            if (_wcsicmp(proc32.szExeFile, ProcessName) == 0)
            {
                HANDLE h = OpenProcess(PROCESS_ALL_ACCESS | PROCESS_SET_INFORMATION ,TRUE, proc32.th32ProcessID);
                SetPriorityClass(h, BELOW_NORMAL_PRIORITY_CLASS);
                CloseHandle(h);
            }
        }
        CloseHandle(hSnap);
    }
}