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Код


#include <windows.h>
#include <tlhelp32.h>
#include "options.h"
LONG WINAPI WndProc(HWND, UINT, WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    memset(&w,0,sizeof(WNDCLASS));
    w.style = CS_HREDRAW | CS_VREDRAW;
    w.lpfnWndProc = WndProc;
    w.hInstance = hInstance;
    w.hCursor = LoadCursor(NULL, IDC_ARROW); 
    w.hbrBackground = bg_color;
    w.lpszClassName = "My Class";
    RegisterClass(&w);
    hwnd =         CreateWindow("My Class", "Процессы в системе",WS_VISIBLE,300, 200, 410, 310, NULL, NULL, hInstance, NULL);
    PList =         CreateWindow("ListBox", NULL, LBS_STANDARD|WS_CHILD|WS_BORDER|WS_VISIBLE, 10,10,300,288,hwnd,(HMENU) IDC_PList,hInstance,NULL);
    RefreshP =     CreateWindow("Button","Обновить",WS_CHILD|WS_BORDER|WS_VISIBLE,315,10,80,20,hwnd,(HMENU) IDC_RefreshP,hInstance,NULL);
    ExitB =     CreateWindow("Button","Выход",WS_CHILD|WS_BORDER|WS_VISIBLE,315,35,80,20,hwnd,(HMENU)IDC_ExitB,hInstance,NULL);
    PId =         CreateWindow("STATIC","ID процесса",WS_CHILD|WS_VISIBLE|WS_BORDER,315,60,80,16,hwnd,NULL,hInstance,NULL);
    Static_TID = CreateWindow("STATIC","Потоки",WS_CHILD|WS_VISIBLE|WS_BORDER,315,80,80,16,hwnd,NULL,hInstance,NULL);
    HFONT hf=CreateFont(-10, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "Tahome");
    SendMessage(PId, WM_SETFONT, (WPARAM)hf, 0);
    SendMessage(Static_TID, WM_SETFONT, (WPARAM)hf, 0);
    SendMessage(PList, WM_SETFONT, (WPARAM)hf, 0);
    SendMessage(ExitB, WM_SETFONT, (WPARAM)hf, 0);
    SendMessage(KillP, WM_SETFONT, (WPARAM)hf, 0);
    SendMessage(RefreshP, WM_SETFONT, (WPARAM)hf, 0);
    GetSystemProcessList();    
    CloseHandle(hSnapshot);
    ShowWindow(hwnd,nCmdShow);
    UpdateWindow(hwnd);
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

LONG WINAPI WndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{
    if (HWND(lparam)==PList)
    {
       switch (HIWORD(wparam))
       {
           case LBN_SELCHANGE:
           {
                if (LOWORD (wparam) >= 1);
                {
                    itemIndex = SendMessage(PList,LB_GETCURSEL,0,0);
                    SendMessage (PList, LB_GETTEXT, itemIndex, (LPARAM) CurrentWord);
                    hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
                    Entry.dwSize = sizeof(Entry);    
                    Process32First(hSnapshot, &Entry);
                    do {
                    if (strcmp(CurrentWord,Entry.szExeFile)==0)
                    {
                        PRID=Entry.th32ProcessID;
                        itoa(PRID,char_pid,10);
                        SetWindowText(PId,char_pid);
                        PRID=Entry.cntThreads;
                        itoa(PRID,char_pid,10);
                        SetWindowText(Static_TID,char_pid);
                        break;
                    }
                    } while (Process32Next(hSnapshot, &Entry ) );
                }
           }
       }
    }
    switch (Message){
    case WM_COMMAND:
        switch(wparam)
        {
            case IDC_RefreshP:
            {
                GetSystemProcessList();
                return 0;
            }
            case IDC_ExitB:
            {
                PostQuitMessage(0);
            }    
        } return 0;
    case WM_DESTROY: 
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, Message, wparam, lparam);
    }
    return 0;
}

Код


// ID Кнопок и элементов программы
#define IDC_RefreshP    101
#define IDC_ExitB        102
#define IDC_PList        103
#define IDC_Pid            104
#define MAX_WORD_LEN 200
// Окна
HBRUSH            bg_color=(HBRUSH)CreateSolidBrush((RGB(149,177,188)));
                                // Цвет формы
MSG                msg;            // Сообщения
WNDCLASS        w;                // Класс окна
HWND            hwnd,            // Главное окно
                PList,            // ListBox - список процессов
                RefreshP,            // Кнопка для обновления списка процессов
                KillP,            // Кнопка убить процесс
                ExitB,            // Выход
                PId,                // ID процесса
                Static_TID;
// Переменные для получения списка процессов
static UINT        itemIndex;
static char        CurrentWord[MAX_WORD_LEN];
int                PRID;
char                char_pid[100];
HANDLE            hSnapshot;
PROCESSENTRY32    Entry;
// эта функция вызывается для каждого процесса в перечислении
void GetSystemProcessList()
{
    SendMessage(PList,LB_RESETCONTENT,NULL,NULL);
    hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    Entry.dwSize = sizeof(Entry);    
    Process32First(hSnapshot, &Entry);
    do {
    SendMessage(PList,LB_ADDSTRING,0,(LPARAM)Entry.szExeFile);
    } while (Process32Next(hSnapshot, &Entry ) );
}