Compaq iPAQ h3760 Datenblatt PDF herunterladen (Seite 73)

ENEE408G Fall 2003 (Update 09/23/2003)

Mobile Computing and Pocket PC Programming

(1) WinCE uses Unicode by which each character is represented by 2 bytes. The

easiest way to convert char to Unicode is to use the _T() function. For

example, to convert “filenamein” to Unicode, you can simply use

_T(“filenamein”). To declare a Unicode array, you should use TCHAR

instead of char.

(2) You also can convert string between ANSI character and Unicode by calling

C run-time functions.

(i) mbstowcs - Convert a multi-byte (ANSI) string to wide character string

(Unicode)

(ii) wcstombs - Convert a wide character string to multi-byte string

A small example is listed in the below table.

WCHAR szwcBuffer[100];

Char szBuffer[100];

Char* lpszConvert = “ANSI string to convert”;

WCHAR* lpszwcConvert = _T(“Unicode string to convert”);

Int nChars;

nChars = mbstowcs(szwcBuffer, lpszConvert, 100);

nChars = wcstombs(szBuffer, lpszwcConvert, 100);

(e) Q: How can I detect the events of hardware control buttons, such as navigation

buttons, on the Pocket PC front panel?

A: Hardware control buttons are treated as keyboard keys. Pressing a hardware

control keys results in WM_KEYDOWN and WM_KEYUP messages as well as a

WM_CHAR message if the virtual key matches a Unicode character. Here is an

example using WM_KEYDOWN. Click View Æ ClassWizard from eVC menu

bar, double click WM_KEYDOWN in the messages list box. You can edit codes

by pressing “Edit Code”.

void CHardwareKeyDemoDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)

{

// TODO: Add your message handler code here and/or call default

switch(nChar){

case VK_LEFT:

MessageBox(_T("Left navigation key is pressed"));

break;

case VK_RIGHT:

MessageBox(_T("Right navigation key is pressed"));

break;

case VK_UP:

MessageBox(_T("Up navigation key is pressed"));

break;

case VK_DOWN:

MessageBox(_T("Down navigation key is pressed"));

break; }

CDialog::OnKeyDown(nChar, nRepCnt, nFlags);

}

(f) Q: How can I debug programs?

A: Under Windows Programming environment, we do not have a command

prompt window to print out data using printf or cout. There are several ways

to debug Windows programs.

1 2 ... 68 69 70 71 72 73 74 75

Kommentare zu diesen Handbüchern

Keine Kommentare

Compaq iPAQ h3760 Datenblatt Seite 73

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein Compaq iPAQ h3760