This example shows a typical use of the WinMessageBox function when debugging an application. The C run-time function sprintf is used to format the body of the message. In this case, it converts the coordinates of the mouse pointer (retrieved with the WinQueryPointerPos function) into a string. The string is then displayed by calling WinMessageBox.

#define INCL_WINDIALOGS         /* Window Dialog Mgr Functions  */
#define INCL_WINPOINTERS        /* Window Pointer Functions     */
#include <os2.h>

CHAR szMsg[100];        /* message                              */
POINTL ptl;             /* message data                         */
HWND   hwndClient;      /* client window handle                 */

WinQueryPointerPos(HWND_DESKTOP, &ptl);
sprintf(szMsg, "x = ld   y = ld", ptl.x, ptl.y);
WinMessageBox(HWND_DESKTOP,
    hwndClient,                /* client-window handle  */
    szMsg,                     /* body of the message   */
    "Debugging information",   /* title of the message  */
    0,                         /* message box id        */
    MB_NOICON | MB_OK);        /* icon and button flags */