Win32Snapshot(快照)

http://baike.baidu.com/view/589425
http://msdn.microsoft.com/en-us/library/ms686832(VS.85).aspx

Snapshots are at the core of the tool help functions. A snapshot is a read-only copy of the current state of one or more of the following lists that reside in system memory: processes, threads, modules, and heaps.

一枚举进程

BOOL GetProcessList( )
{
  HANDLE hProcessSnap;
  HANDLE hProcess;
  
  DWORD dwPriorityClass;

  // Take a snapshot of all processes in the system.
  hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
  if( hProcessSnap == INVALID_HANDLE_VALUE )
  {
    printError( TEXT("CreateToolhelp32Snapshot (of processes)") );
    return( FALSE );
  }
  PROCESSENTRY32 pe32;
  pe32.dwSize = sizeof( PROCESSENTRY32 );
  // Retrieve information about the first process,
  // and exit if unsuccessful
  if(!Process32First( hProcessSnap, &pe32 ) )
  {
    printError( TEXT("Process32First") ); // show cause of failure
    CloseHandle( hProcessSnap );          // clean the snapshot object
    return( FALSE );
  }
  int i=0;
  // Now walk the snapshot of processes, and
  // display information about each process in turn
  do
  {
    _tprintf( TEXT("\nPROCESS NAME:  %s"), pe32.szExeFile );
    printf( "\n-----------------------------------------------------" );
    //ListProcessThreads( pe32.th32ProcessID );
    //ListProcessModules( pe32.th32ProcessID );
  } while( Process32Next( hProcessSnap, &pe32 ) );
  CloseHandle( hProcessSnap );
  return( TRUE );
}

二.枚举进程中的线程

BOOL ListProcessThreads( DWORD dwOwnerPID ) 
{ 
  HANDLE hThreadSnap = INVALID_HANDLE_VALUE; 
  THREADENTRY32 te32; 
 
  // Take a snapshot of all running threads  
  hThreadSnap = CreateToolhelp32Snapshot( TH32CS_SNAPTHREAD, 0 ); 
  if( hThreadSnap == INVALID_HANDLE_VALUE ) 
    return( FALSE ); 
 
  // Fill in the size of the structure before using it. 
  te32.dwSize = sizeof(THREADENTRY32); 
 
  // Retrieve information about the first thread,
  // and exit if unsuccessful
  if( !Thread32First( hThreadSnap, &te32 ) ) 
  {
    printError( TEXT("Thread32First") ); // show cause of failure
    CloseHandle( hThreadSnap );          // clean the snapshot object
    return( FALSE );
  }

  do 
  { 
    if( te32.th32OwnerProcessID == dwOwnerPID )
    {
      printf( "\n\n     THREAD ID      = 0x%08X", te32.th32ThreadID ); 
      printf( "\n     Base priority  = %d", te32.tpBasePri ); 
      printf( "\n     Delta priority = %d", te32.tpDeltaPri ); 
    }
  } while( Thread32Next(hThreadSnap, &te32 ) ); 

  CloseHandle( hThreadSnap );
  return( TRUE );
}

三.枚举模块信息

BOOL ListProcessModules( DWORD dwPID )
{
  HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
  MODULEENTRY32 me32;

  // Take a snapshot of all modules in the specified process.
  hModuleSnap = CreateToolhelp32Snapshot( TH32CS_SNAPMODULE, dwPID );
  if( hModuleSnap == INVALID_HANDLE_VALUE )
  {
    printError( TEXT("CreateToolhelp32Snapshot (of modules)") );
    return( FALSE );
  }

  // Set the size of the structure before using it.
  me32.dwSize = sizeof( MODULEENTRY32 );

  // Retrieve information about the first module,
  // and exit if unsuccessful
  if( !Module32First( hModuleSnap, &me32 ) )
  {
    printError( TEXT("Module32First") );  // show cause of failure
    CloseHandle( hModuleSnap );           // clean the snapshot object
    return( FALSE );
  }

  // Now walk the module list of the process,
  // and display information about each module
  do
  {
    _tprintf( TEXT("\n\n     MODULE NAME:     %s"),   me32.szModule );
    _tprintf( TEXT("\n     Executable     = %s"),     me32.szExePath );
    printf( "\n     Process ID     = 0x%08X",         me32.th32ProcessID );
    printf( "\n     Ref count (g)  = 0x%04X",     me32.GlblcntUsage );
    printf( "\n     Ref count (p)  = 0x%04X",     me32.ProccntUsage );
    printf( "\n     Base address   = 0x%08X", (DWORD) me32.modBaseAddr );
    printf( "\n     Base size      = %d",             me32.modBaseSize );

  } while( Module32Next( hModuleSnap, &me32 ) );

  CloseHandle( hModuleSnap );
  return( TRUE );
}

参考:http://www.cnblogs.com/carekee/articles/1948288.html

使用EnumProcesses函数枚举进程

要记得引用lib文件

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <psapi.h>
#pragma comment(lib,"Psapi.lib ")
void PrintProcessNameAndID( DWORD processID )
{
    TCHAR szProcessName[MAX_PATH] = TEXT("<unknown>");
    // 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) );
        }
    }

    // Print the process name and identifier.
    _tprintf( TEXT("%s  (PID: %u)\n"), szProcessName, processID );

    CloseHandle( hProcess );
}

void main( )
{
    // Get the list of process identifiers.

    DWORD aProcesses[1024], cbNeeded, cProcesses;
    unsigned int i;
    if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
        return;

    // Calculate how many process identifiers were returned.
    cProcesses = cbNeeded / sizeof(DWORD);
    // Print the name and process identifier for each process.
    for ( i = 0; i < cProcesses; i++ )
        if( aProcesses[i] != 0 )
        {
            PrintProcessNameAndID( aProcesses[i] );
        }
}