Tooltip Control Example demo

To create a tooltip control specify TOOLTIPS_CLASS as the window class and register the class by specifying the ICC_WIN95_CLASSES bit flag in the accompanying INITCOMMONCONTROLSEX structure.

#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <commctrl.h>

#pragma comment(lib,"comctl32.lib")

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

HWND hwndTip;
HWND hButton;

int WINAPI WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow)
{
    MSG msg;
    WNDCLASS wc;
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL,IDC_ARROW);
    wc.hbrBackground =
        GetSysColorBrush(COLOR_3DFACE);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = TEXT("TooltipClass");

    RegisterClass(&wc);

    CreateWindow(
        wc.lpszClassName,
        TEXT("Tooltip Demo"),
        WS_OVERLAPPEDWINDOW |
        WS_VISIBLE,
        100,
        100,
        250,
        150,
        NULL,
        NULL,
        hInstance,
        NULL);

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

LRESULT CALLBACK WndProc(
    HWND hwnd,
    UINT msg,
    WPARAM wParam,
    LPARAM lParam)
{
    switch(msg)
    {
    case WM_CREATE:
    {
        INITCOMMONCONTROLSEX iccex;
        // Load tooltip common control
        iccex.dwSize =
            sizeof(INITCOMMONCONTROLSEX);
        iccex.dwICC =
            ICC_WIN95_CLASSES;
        InitCommonControlsEx(&iccex);

        // Create button
        hButton =
        CreateWindowEx(
            0,
            TEXT("BUTTON"),
            TEXT("Tooltip test"),
            WS_CHILD |
            WS_VISIBLE |
            BS_PUSHBUTTON,
            10,
            10,
            150,
            30,
            hwnd,
            NULL,
            NULL,
            NULL);

        // Create tooltip window
        hwndTip =
        CreateWindowEx(
            WS_EX_TOPMOST,
            TOOLTIPS_CLASS,
            NULL,
            WS_POPUP |
            TTS_NOPREFIX |
            TTS_ALWAYSTIP,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            hwnd,
            NULL,
            NULL,
            NULL);

        // Describe the control that receives tooltip
        TOOLINFO toolInfo;
        ZeroMemory(
            &toolInfo,
            sizeof(TOOLINFO));
        toolInfo.cbSize =
            sizeof(TOOLINFO);
        toolInfo.uFlags =
            TTF_IDISHWND |
            TTF_SUBCLASS;
        toolInfo.hwnd =
            hwnd;
        toolInfo.uId =
            (UINT_PTR)hButton;
        toolInfo.lpszText =
            TEXT("This is a tooltip");
            
        // Attach tooltip to button
        SendMessage(
            hwndTip,
            TTM_ADDTOOL,
            0,
            (LPARAM)&toolInfo);
        break;
    }

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