Compaq iPAQ h3760 Datenblatt PDF herunterladen (Seite 18)

ENEE408G Fall 2003 (Update 09/23/2003)

Mobile Computing and Pocket PC Programming

Microsoft Win32 API. Those API’s are a collection of dynamic-link libraries

(DLLs

) containing many procedures used by Windows-based desktop platforms.

With these DLLs, we can expand the eVB capability, such as displaying windows and

graphics, managing memory and power, and accessing persistent storage, which

cannot be done by built-in controls.

Windows CE platform SDK for Pocket PC provides a text file, Winceapi.txt, that

contains predefined declarations for many of the Windows CE API procedures

commonly used in eMbedded Visual Basic applications. To call those functions, we

should follow the syntax:

[Scope] Declare Function|Sub {FunctionName} Lib “{Library File Name}” _

[Alias “Library Function Name”] _

({Function Parameter List}) As {Function Return}

We can use the convenient API Viewer to use those Constants, Declares, or Types

from this file.

(1) First, we run an API Viewer from Start

Programs

408g

Microsoft

eMbedded Visual Tools

Tools

Api Text Viewer.

DLL is an executable file that contains one or more exportable functions. In other words, another

executable files (EXE or DLL) can call those functions. In general, DLLs have much simpler structure

than EXE files, since DLLs do not have graphical interfaces or Windows message processors. However,

we cannot use eMbedded Visual Basic to create our own DLLs. We can make API calls from eVB, instead.

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Compaq iPAQ h3760 Datenblatt Seite 18