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WindowsCE.[Essential Windows CE Application Programming].Jon Wiley & Son.zip

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<B>Essential Windows CE Application Programming</B>
<FONT SIZE="-1">
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<I>(Publisher: John Wiley & Sons, Inc.)</I>
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Author(s): Robert Burdick
<BR>
ISBN: 0471327476
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Publication Date: 03/01/99
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<P><BR></P>
<P><FONT SIZE="+1"><B>Flash Card APIs</B></FONT></P>
<P>There are some additional functions provided by Windows CE for enumerating flash cards and files on flash cards. Use of these functions is very similar to their file system API counterparts.
</P>
<P><FONT SIZE="+1"><B><I>Enumerating Flash Cards</I></B></FONT></P>
<P>The first set of flash card API functions is used to enumerate flash cards or other mountable file systems attached to a device.
</P>
<P>The first of these functions is <I>FindFirstFlashCard</I>. This function is used to find the first flash card (or other mountable file system) on a device:</P>
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<PRE>
  FindFirstFlashCard(lpFindFlashData);
</PRE>
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<P>The only parameter to this function is a pointer to a WIN32_FIND_ DATA structure. This function is analogous to <I>FindFirstFile</I>. The difference is that instead of returning WIN32_FIND_DATA information about the first specified file or directory, it returns information about the first flash card it finds.</P>
<P>The most important piece of information <I>FindFirstFlashCard</I> returns is the object identifier of the flash card. This value is returned in the <I>dwOID</I> member of the <I>lpFindFlashData</I> parameter.</P>
<P>Also like <I>FindFirstFile</I>, <I>FindFirstFlashCard</I> returns a search handle that can be used to perform searches for additional flash cards. Additional flash cards can be found with subsequent calls to <I>FindNextFlashCard</I>:</P>
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<PRE>
  FindNextFlashCard(hFlashCard, lpFindFlashData);
</PRE>
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<P><I>hFlashCard</I> is the search handle returned by <I>FindFirstFlashCard</I>. <I>lpFindFlashData</I> is a WIN32_FIND_DATA structure pointer containing information about the next flash card.</P>
<P>Note that it is not common for a Windows CE&#150;based device to contain more than one flash card.</P>
<P>Flash card search handles, like file search handles, are closed with the <I>FindClose</I> function.</P>
<P><FONT SIZE="+1"><B><I>Searching for Flash Card Files</I></B></FONT></P>
<P>The second set of flash card API functions is used to enumerate files and directories stored on flash cards.
</P>
<P><I>FindFirstProjectFile</I> is the same as <I>FindFirstFile</I> except that it can be made to look for files on a specified mountable file system:</P>
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<PRE>
  FindFirstProjectFile(lpFileName, lpFindFileData,
    dwOidFlash, lpszProj);
</PRE>
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<P>The first two parameters of this function are the same as in <I>FindFirstFile.</I> They contain the file or directory name to search for and the returned WIN32_FIND_DATA, respectively.</P>
<P><I>dwOidFlash</I> identifies the storage card to search on. This value is obtained by a previous call to <I>FindFirstFlashCard</I> or <I>FindNextFlashCard</I>. This parameter can be set to zero, in which case the main device file system is searched instead of a mountable file system. <I>FindFirstProjectFile</I> can thus be used just like <I>FindFirstFile</I> on devices that include mountable file systems. In fact, it is recommended that on devices such as the Palm-size PC, <I>FindFirstProjectFile</I> be used exclusively.</P>
<P>The final parameter, <I>lpszProj</I>, indicates the folder to start the search in. If NULL, the search starts with the \My Documents folder.</P>
<P><I>FindFirstProjectFile</I> returns a search handle, just like <I>FindFirstFile</I>. This search handle is used to perform subsequent searches with the <I>FindNextProjectFile</I> function:</P>
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<PRE>
  FindNextProjectFile(hHandle, lpFindProjData);
</PRE>
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<P>The parameters and behavior of this function are the same as <I>FindNextFile</I>.</P>
<H3><A NAME="Heading14"></A><FONT COLOR="#000077">Concluding Remarks</FONT></H3>
<P>That&#146;s it for the Windows CE file system. You should now be able to add file support to your Windows CE applications in order to store and retrieve data. But more often you will want to store and organize information in a more structured format than a simple flat data file. For this purpose, Windows CE provides a simple database technology. Windows CE databases are the subject of the next chapter.
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