#define _WIN32_WINNT 0x501
#include <windows.h>
#include <psapi.h>
#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <fstream>
using namespace std;

class ProcessInfo {
public:
   ProcessInfo(HANDLE handle, DWORD id, string name) {
      this->handle = handle;
      this->id = id;
      this->name = name;
   }

   BOOL WINAPI GetProcessHandleCount(
   HANDLE hProcess,
   PDWORD pdwHandleCount
   );

   HANDLE getProcessHandle() {return handle;}
   DWORD getProcessId() {return id;}
   string getProcessName() {return name;}
   void terminate() {
      if (!handle) return;
      DWORD exitCode;
      if (GetExitCodeProcess(handle, &exitCode)) {
         TerminateProcess(handle, exitCode);
      }
      handle = 0;
   }
   void closeHandle() {
      if (!handle) return;
      CloseHandle(handle);
      handle = 0;
   }
   bool isRunning() {
      if (!handle) return false;
      DWORD handleCount;
      if (GetProcessHandleCount(handle, &handleCount)) {
         if (handleCount) return true;
      }
      handle = 0;
      return false;
   }
   static vector <ProcessInfo> getProcessInfos() {
      int arraySize = 128;
      DWORD *ids = new DWORD[arraySize];
      DWORD idByteCount;
      vector <ProcessInfo> processInfos;
      while(EnumProcesses(ids, arraySize*sizeof(DWORD), &idByteCount)) {
         if (idByteCount < arraySize*sizeof(DWORD)) {
            for (int i = 0; i < idByteCount/sizeof(DWORD); i++) {
               HANDLE handle;
               if (handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, ids[i])) {
                  char buf[256];
                  if (!GetModuleBaseName(handle, 0, buf, sizeof(buf))) strcpy(buf, "<unknown>");
                  processInfos.push_back(ProcessInfo(handle, ids[i], buf));
               }
            }
            break;
         } else {
            delete [] ids;
            arraySize *= 2;
            ids = new DWORD[arraySize];
         }
      }
      delete [] ids;
      return processInfos;
   }
   static string makeProcessInfosString(vector <ProcessInfo> processInfos) {
      stringstream ss;
      ss << processInfos.size() << " processes:\n" << endl;
      for (int i = 0; i < processInfos.size(); i++) {
         ss << (processInfos[i].isRunning()?"running, ":"         ")
            << "id=" << processInfos[i].getProcessId()
            << ", handle=" << (DWORD)processInfos[i].getProcessHandle()
            << ", name=\"" << processInfos[i].getProcessName() << "\""
            << endl;
      }
      return ss.str();
   }
private:
   string name;
   HANDLE handle;
   DWORD id;
};

string getLocalTimeString() {
   SYSTEMTIME sysTime;
   GetLocalTime(&sysTime);
   stringstream ss;
   ss << (sysTime.wHour>=10?"":"0") << sysTime.wHour
      << ':' << (sysTime.wMinute>=10?"":"0") << sysTime.wMinute
      << ':' << (sysTime.wSecond>=10?"":"0") << sysTime.wSecond
      << ", " << sysTime.wDay
      << '.' << sysTime.wMonth
      << '.' << sysTime.wYear;
   return ss.str();
}

int main() {
   fstream fs;
   fs.open("c:\\processes.txt", ios_base::out | ios_base::trunc);
   if (!fs.is_open()) return 0;
   fs << getLocalTimeString() << endl;
   fs << ProcessInfo::makeProcessInfosString(ProcessInfo::getProcessInfos());
   fs.close();
   return 0;
}

Fehler:
C:\DOKUME_1\x\LOKALE1\Temp\ccKYaaaa.o(.text\_ZN11ProcessInfo9isRunningEv\[ProcessInfo::isRunning()\]+0x30) In function `ZNSt24\_\_copy\_backward\_dispatchIP11ProcessInfoS1\_12\_\_false\_typeE4copyES1\_S1\_S1\_': \[Linker error\] undefined reference to `_ZN11ProcessInfo21GetProcessHandleCountEPvPm@12' C:\\DOKUME~1\\x\\LOKALE~1\\Temp\\ccKYaaaa.o(.text_ZN11ProcessInfo9isRunningEv[ProcessInfo::isRunning()]+0x30) ld returned 1 exit status

Ich benutzte Dev-C++ Compiler(4.9.9.2 Neuste Version), -lpsapi habe ich bei Compileroptionen eingebunden. Nun wüsste ich gerne wie ich diesen Fehler beheben könnte!
Arbeite unter Windows XP Home SP 2

Danke an Alle für die Hilfe!
Gruß Twitch