自己一直想做一个和windows资源管理器一样的程序，所以看了一下如何列举系统的所有进程。主要用到几个函数
CreateToolhelp32Snapshot，Process32First，Process32Next和一个结构体PROCESSENTRY32。其中用法可以看百度百科或MSDN

#include <windows.h> 
#include <tlhelp32.h> 
#include <tchar.h> 
#include <stdio.h> 
#include<iostream> 
using namespace std; 
int main() 
{ 
    HANDLE hProcessSnap; 
    HANDLE hProcess; 
    PROCESSENTRY32 pe32;//用来存储进程的相关信息 
    DWORD dwPriorityClass;// 
   
    //建立进程快照 
    hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0);//获得系统进程的快照 
   
    if(hProcessSnap == INVALID_HANDLE_VALUE) 
    { 
        cout<<"快照创建失败"<<endl; 
        return 0; 
    } 
    pe32.dwSize = sizeof(PROCESSENTRY32); 
    if(Process32First( hProcessSnap, &pe32) == NULL) 
    { 
        cout<<"error"<<endl; 
        CloseHandle(hProcessSnap); 
   
    } 
    int i = 0; 
    do{ 
        cout<<"------------"<<i++<<"个进程------------------------"<<endl; 
        //cout<<" name : "<<pe32.szExeFile<<endl; 
        _tprintf( TEXT("\nPROCESS NAME: %s"), pe32.szExeFile ); 
        cout<<endl; 
        cout<< "Process ID = "<< pe32.th32ProcessID <<endl; 
        cout<< "Thread count = "<<pe32.cntThreads <<endl;  
        cout<< "Parent process ID = "<< pe32.th32ParentProcessID <<endl;;  
        cout<< "Priority base = "<< pe32.pcPriClassBase <<endl;  
    }while( Process32Next( hProcessSnap, &pe32) ); 
    return 0; 
   
} 
 

当然，上面程序是我从一个程序中摘出来的，这是源程序，忘了引用的哪了，如果作者看到，请告知引用地址。

这个程序实现了对系统进程，单个进程和线程的快照，主要还是拿几个函数，有时间的话做一个可视化的，和大家分享

#include <windows.h> 
#include <tlhelp32.h> 
#include <tchar.h> 
#include <stdio.h> 
// Forward declarations: 
BOOL GetProcessList( ); 
BOOL ListProcessModules( DWORD dwPID ); 
BOOL ListProcessThreads( DWORD dwOwnerPID ); 
void printError( TCHAR* msg ); 
void main( ) 
{  
    GetProcessList( ); 
} 
BOOL GetProcessList( ) 
{  
    HANDLE hProcessSnap;  
    HANDLE hProcess;  
    PROCESSENTRY32 pe32; //用来存放快照进程信息的一个结构体 
    DWORD dwPriorityClass; // Take a snapshot of all processes in the system.  
    hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );  
    /*
    CreateToolhelp32Snapshot函数为指定的进程、进程使用的堆[HEAP]、模块[MODULE]、线程[THREAD]）建立一个快照[snapshot]。 　　
    HANDLE WINAPI CreateToolhelp32Snapshot( 　　DWORD dwFlags, //用来指定“快照”中需要返回的对象，可以是TH32CS_SNAPPROCESS等 　　
                                  DWORD th32ProcessID //一个进程ID号，用来指定要获取哪一个进程的快照，当获取系统进程列表或获取当前进程快照时可以设为0 　　); 
    */ 
    if( hProcessSnap == INVALID_HANDLE_VALUE )  
    {  
        printError( TEXT("CreateToolhelp32Snapshot (of processes)") );  
        return( FALSE );  
    } // Set the size of the structure before using it.  
    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  
        ( FALSE );  
    } // Now walk the snapshot of processes, and  
    // display information about each process in turn  
    do { 
        printf( "\n\n=====================================================" );  
        _tprintf( TEXT("\nPROCESS NAME: %s"), pe32.szExeFile );  
        printf( "\n-----------------------------------------------------" ); // Retrieve the priority class.  
        dwPriorityClass = 0;  
        hProcess = OpenProcess( PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID );  
        /*
        OpenProcess 函数用来打开一个已存在的进程对象,并返回进程的句柄。　　
        1.函数原型 　　HANDLE OpenProcess( 　　DWORD dwDesiredAccess, //渴望得到的访问权限(标志) 　　
                                         BOOL bInheritHandle, // 是否继承句柄 　　
                                         DWORD dwProcessId// 进程标示符 　　); 
        */ 
        if( hProcess == NULL ) 
            printError( TEXT("OpenProcess") );  
        else {  
            dwPriorityClass = GetPriorityClass( hProcess );  
            if( !dwPriorityClass )  
                printError( TEXT("GetPriorityClass") );  
            CloseHandle( hProcess );  
        }  
        printf( "\n Process ID = 0x%08X", pe32.th32ProcessID );  
        printf( "\n Thread count = %d", pe32.cntThreads );  
        printf( "\n Parent process ID = 0x%08X", pe32.th32ParentProcessID );  
        printf( "\n Priority base = %d", pe32.pcPriClassBase );  
        if( dwPriorityClass )  
            printf( "\n Priority class = %d", dwPriorityClass ); // List the modules and threads associated with this process  
        //ListProcessModules( pe32.th32ProcessID );  
        //ListProcessThreads( pe32.th32ProcessID ); 
    } while( Process32Next( hProcessSnap, &pe32 ) ); 
    CloseHandle( hProcessSnap );  
    return( TRUE ); 
} 
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 ); 
} 
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 ); 
    } // Now walk the thread list of the system, 
    // and display information about each thread  
    // associated with the specified process  
    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 ); 
} 
void printError( TCHAR* msg ) 
{  
    DWORD eNum;  
    TCHAR sysMsg[256];  
    TCHAR* p;  
    eNum = GetLastError( );  
    FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, eNum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language  
        sysMsg,256, NULL ); // Trim the end of the line and terminate it with a null  
    p = sysMsg; 
    while( ( *p > 31 ) || ( *p == 9 ) )  
        ++p;  
    do { 
        *p-- = 0; 
    } while( ( p >= sysMsg ) && ( ( *p == '.' ) || ( *p < 33 ) ) ); // Display the message  
    _tprintf( TEXT("\n WARNING: %s failed with error %d (%s)"), msg, eNum, sysMsg ); 
}