windows判断进程是否存在？

const   char   DESTPROC[19]   =   "cmd.exe";    
DWORD   pid   =   ProcessToPID(DESTPROC);    
返回为0就是没有  

DWORD   ProcessToPID(const   char   *InputProcessName)
{
  DWORD   aProcesses[1024],   cbNeeded,   cProcesses;
  unsigned   int   i;
  HANDLE   hProcess   =   NULL;
  HMODULE   hMod   =   NULL;
  char   szProcessName[MAX_PATH]   =   "UnknownProcess";

  AddPrivilege(SE_DEBUG_NAME);

  //   计算目前有多少进程,   aProcesses[]用来存放有效的进程PIDs
  if   (   !EnumProcesses(   aProcesses,   sizeof(aProcesses),   &cbNeeded   )   )
  {
    return   0;
  }

  cProcesses   =   cbNeeded   /   sizeof(DWORD);
  //   按有效的PID遍历所有的进程
  for   (   i   =   0;   i   <   cProcesses;   i++   )
  {
    //   打开特定PID的进程
    hProcess   =   OpenProcess(   PROCESS_QUERY_INFORMATION   |
        PROCESS_VM_READ,
        FALSE,   aProcesses[i]);
    //   取得特定PID的进程名
    if   (   hProcess   )
    {
      if   (   EnumProcessModules(   hProcess,   &hMod,   sizeof(hMod),   &cbNeeded)   )
      {
        GetModuleBaseName(   hProcess,   hMod,
            szProcessName,   sizeof(szProcessName)   );
        //将取得的进程名与输入的进程名比较，如相同则返回进程PID
        if(!stricmp(szProcessName,   InputProcessName))
        {
          CloseHandle(   hProcess   );
          return   aProcesses[i];
        }
      }
    }//end   of   if   (   hProcess   )
  }//end   of   for
  //没有找到相应的进程名，返回0
  CloseHandle(   hProcess   );
  return   0;
}

也可以枚举得到所有进程的应用程序名，然后和知道应用程序名比较判断。

DWORD GetProcessidFromName(LPCTSTR name)
{
  PROCESSENTRY32 pe;
  DWORD id=0;
  HANDLE hSnapshot=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
  pe.dwSize=sizeof(PROCESSENTRY32);
  if(!Process32First(hSnapshot,&pe))
    return 0;
  while(1)
  {
    pe.dwSize=sizeof(PROCESSENTRY32);
    if(Process32Next(hSnapshot,&pe)==FALSE)
      break;
    if(strcmp(pe.szExeFile,name)==0)
    {
      id=pe.th32ProcessID;

      break;
    }


  }
  CloseHandle(hSnapshot);
  return id;
}