Accessing the Pen API from Applications - Microsoft Windows Pen API Programmer's Reference (penapi.hlp)

Microsoft Windows Pen API
Programmer's Reference

Accessing the Pen API from Applications

As Figure 1.5 shows, applications that accept user input are divided into two categories: pen-aware and pen-unaware applications. A pen-unaware application, as the name implies, is written to expect input only through the keyboard or mouse, unaware of the existence of Windows pen services. However, if a pen device is present, Windows 95 supports its use both as a mouse and for text entry with a pen-unaware application. For details about how Windows allows the use of a pen with an application not written to accept pen input, see "Pen-Unaware Applications" in Chapter 2, "Starting Out with System Defaults."

The Pen API is designed for small handheld systems with limited memory and power, so its API consists of 16-bit functions. Therefore, Windows provides a thunk layer for 32-bit applications to call through to the API. The thunk layer automatically converts 32-bit function parameters and structure data to 16-bit equivalents. The application must ensure its data will fit into the smaller sizes before calling into the Pen API. See Appendix B for information about using the 32-bit API.

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