font_showxbf.c

ucgui在windows下的演示程序

/*
*********************************************************************************************************
*                                             uC/GUI V4.04
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : FONT_ShowXBF.c
Purpose     : Shows how to use (E)xternal (B)inary (F)onts
----------------------------------------------------------------------
*/

#include <windows.h>

#include "GUI.h"
#include "EDIT.h"

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _GetFileName
*
* Purpose:
*   Returns the file name of the XBF file to be used
*/
static void _GetFileName(char * pPath, unsigned MaxSize) {
  WM_HWIN hWin;
  
  /* Set default value on first call */
  if (!strlen(pPath)) {
    strcpy(pPath, "Sample\\GUI\\FONT_ShowXBF\\ExtBinFont.xbf");
  }
  /* Display small hint */
  GUI_SetFont(&GUI_Font10_ASCII);
  GUI_DispStringHCenterAt("Please enter the file name of the XBF-file:", 160, 80);
  /* Create edit widget */
  hWin = EDIT_Create(10, 120, 300, 20, 0, MaxSize, 0);
  EDIT_SetText(hWin, pPath);
  WM_SetFocus(hWin);
  /* Wait until GUI_KEY_ENTER has been pressed */
  while (GUI_GetKey() != GUI_KEY_ENTER) {
    GUI_Delay(100);
  }
  /* Get filename from EDIT widget */
  EDIT_GetText(hWin, pPath, MaxSize);
  /* Create edit widget */
  WM_DeleteWindow(hWin);
  /* Clear screen */
  GUI_ClearRect(0, 40, 319, 239);
}

/*********************************************************************
*
*       _cbGetData
*
* Purpose:
*   Callback function for getting font data
*
* Parameters:
*   Off      - Position of XBF file to be read
*   NumBytes - Number of requested bytes
*   pVoid    - Application defined pointer
*   pBuffer  - Pointer to buffer to be filled by the function
*
* Return value:
*   0 on success, 1 on error
*/
static int _cbGetData(U32 Off, U16 NumBytes, void * pVoid, void * pBuffer) {
  DWORD NumBytesRead;
  HANDLE hFile;

  hFile = *(HANDLE *)pVoid;
  /* Set file pointer to the requested position */
  if (SetFilePointer(hFile, Off, 0, FILE_BEGIN) == 0xFFFFFFFF) {
    return 1; /* Error */
  }
  /* Read font data */
  if (!ReadFile(hFile, pBuffer, NumBytes, &NumBytesRead, 0)) {
    return 1; /* Error */
  }
  if (NumBytesRead != NumBytes) {
    return 1; /* Error */
  }
  return 0; /* Ok */
}

/*********************************************************************
*
*       _ShowXBF
*
* Purpose:
*   Small sub routine which creates (and selects) a XBF font,
*   shows 'Hello world!' and waits for a keypress
*/
static void _ShowXBF(void * pVoid) {
  GUI_FONT     Font;
  GUI_XBF_DATA XBF_Data;

  /* Create XBF font */
  GUI_XBF_CreateFont(&Font,             /* Pointer to GUI_FONT structure in RAM */
                     &XBF_Data,         /* Pointer to GUI_XBF_DATA structure in RAM */
                     GUI_XBF_TYPE_PROP, /* Font type to be created */
                     _cbGetData,        /* Pointer to callback function */
                     pVoid);            /* Pointer to be passed to GetData function */
  /* Show 'Hello world!' */
  GUI_DispStringHCenterAt("Hello world!", 160, 80);
  /* Display hint */
  GUI_SetFont(&GUI_Font13_ASCII);
  GUI_DispStringHCenterAt("Press any key to continue...", 160, 120);
  /* Wait for pressing a key */
  while (!GUI_GetKey()) {
    GUI_Delay(100);
  }
  /* Delete XBF font and clear display */
  GUI_XBF_DeleteFont(&Font);
  GUI_ClearRect(0, 40, 319, 239);
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  char acPath[_MAX_PATH] = {0};
  HANDLE hFile;

  /* Initialize GUI */
  GUI_Init(); 
  GUI_SetFont(&GUI_Font24_ASCII);
  GUI_DispStringHCenterAt("External binary font sample", 160, 5);
  while (1) {
    /* Get font file name... */
    _GetFileName(acPath, sizeof(acPath));
    /* ...and open the file */
    hFile = CreateFile(acPath, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
    if (hFile != INVALID_HANDLE_VALUE) {
      /* On success call demo routine */
      _ShowXBF(&hFile);
      CloseHandle(hFile);
    } else {
      /* On error show message box */
      GUI_MessageBox("File not found!", "Error", GUI_MESSAGEBOX_CF_MODAL);
      GUI_ClearRect(0, 40, 319, 239);
    }
  }
}

/*************************** End of file ****************************/