Progress Bar Control Example

To create a progress bar control specify PROGRESS_CLASS as the window class and register the class by specifying the ICC_PROGRESS_CLASS bit flag in the accompanying INITCOMMONCONTROLSEX structure.

#include <windows.h>
#include <commctrl.h>
#pragma comment(lib, "comctl32.lib")

#define ID_TIMER 2
#define ID_BUTTON 100

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void CreateControls(HWND);

HWND hwndPrgBar;
HWND hbtn;

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PWSTR lpCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
    WNDCLASS wc = {0};
    wc.lpszClassName = TEXT("Progress bar");
    wc.hInstance = hInstance;
    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
    wc.lpfnWndProc = WndProc;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    RegisterClass(&wc);

    hwnd = CreateWindow(
        wc.lpszClassName,
        TEXT("Progress Bar"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        100, 100, 260, 170,
        NULL, NULL, hInstance, NULL);

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
                         WPARAM wParam, LPARAM lParam)
{
    static int c = 0;
    switch (msg)
    {
    case WM_CREATE:
        CreateControls(hwnd);
        return 0;
        
    case WM_TIMER:
        SendMessage(hwndPrgBar, PBM_STEPIT, 0, 0);
        c++;
        if (c >= 100)
        {
            KillTimer(hwnd, ID_TIMER);
            SetWindowText(hbtn, TEXT("Start"));
            EnableWindow(hbtn, TRUE);
            c = 0;
        }
        return 0;

    case WM_COMMAND:
        if ((HWND)lParam == hbtn)
        {
            if (c == 0)
            {
                c = 1;
                SendMessage(hwndPrgBar, PBM_SETPOS, 0, 0);
                EnableWindow(hbtn, FALSE);
                SetWindowText(hbtn, TEXT("In Progress"));
                SetTimer(hwnd, ID_TIMER, 5, NULL);
            }
        }
        return 0;

    case WM_DESTROY:
        KillTimer(hwnd, ID_TIMER);
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}

void CreateControls(HWND hwnd)
{
    // Load the progress bar common control.

    INITCOMMONCONTROLSEX icex;
    icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
    icex.dwICC = ICC_PROGRESS_CLASS;
    InitCommonControlsEx(&icex);

    // Create progress bar.

    hwndPrgBar = CreateWindowEx(
        0,
        PROGRESS_CLASS,
        NULL,
        WS_CHILD | WS_VISIBLE | PBS_SMOOTH,
        30, 20, 190, 25,
        hwnd,
        NULL,
        NULL,
        NULL);

    // Create button.

    hbtn = CreateWindow(
        TEXT("BUTTON"),
        TEXT("Start"),
        WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
        85, 90, 85, 25,
        hwnd,
        (HMENU)ID_BUTTON,
        NULL,
        NULL);

    // Set progress bar range.

    SendMessage(hwndPrgBar,
                PBM_SETRANGE,
                0,
                MAKELPARAM(0, 100));

    // Set step increment.

    SendMessage(hwndPrgBar,
                PBM_SETSTEP,
                1,
                0);
}