Check if process is running - Windows

i'm using QT to check if process is running and i used the same code in msdn site.

It worked fine on Visual Studio but i'm having a problem making it work on QT.

Here's the code :

bool matchProcessName( DWORD processID, std::string processName)
{
    TCHAR szProcessName[MAX_PATH] = TEXT(L"notepad.exe");

// Get a handle to the process.

HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
                               PROCESS_VM_READ,
                               FALSE, processID );

// Get the process name.

if (NULL != hProcess )
{
    HMODULE hMod;
    DWORD cbNeeded;

    if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
         &cbNeeded) )
    {
        GetModuleBaseName( hProcess, hMod, szProcessName,
                           sizeof(szProcessName)/sizeof(TCHAR) );
    }
}

// Compare process name with your string
bool matchFound = !_tcscmp(szProcessName, processName.c_str() );

// Release the handle to the process.
CloseHandle( hProcess );

return matchFound;
}

The Error i'm getting is this :

error: cannot convert 'TCHAR*' to 'const char*' for argument '1' to 'int strcmp(const char*, const char*)'

How can i make this work on QT ?

Thanks alot.

Update

I also tried this code :

DWORD FindProcessId(char* processName)
{

char* p = strrchr(processName, '\\');
if(p)
    processName = p+1;

PROCESSENTRY32 processInfo;
processInfo.dwSize = sizeof(processInfo);

HANDLE processesSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,     NULL);
if ( processesSnapshot == INVALID_HANDLE_VALUE )
    return 0;

Process32First(processesSnapshot, &processInfo);
if ( !strcmp(processName, processInfo.szExeFile) )
{
    CloseHandle(processesSnapshot);
    return processInfo.th32ProcessID;
}

while ( Process32Next(processesSnapshot, &processInfo) )
{
    if ( !strcmp(processName, processInfo.szExeFile) )
    {
      CloseHandle(processesSnapshot);
      return processInfo.th32ProcessID;
    }
}

CloseHandle(processesSnapshot);
return 0;
}

I'm also getting an error :cannot convert 'WCHAR*' to 'const char*' for argument '2' to 'int strcmp(const char*, const char*)'

I prefer if i can make 2nd method work !

Thanks again