HI i used xbf file from sd card, used open file and reference FONT_ShowXBF.c(From segger.com/emwin-samples.html )

my code :

/**XBF**/
static int _cbGetData(U32 Off, U16 NumBytes, void * pVoid, void * pBuffer) {
unsigned long NumBytesRead;
FILE *hFile;
U32 fpos;

hFile = (FILE *)pVoid;
if ( fseek(pVoid, (long )Off, SEEK_CUR ))
{
return 1; /* Error */
}

if (ftell (pVoid) == 0xFFFFFFFF) {
return 1; /* Error */
}

fread (&pBuffer, sizeof(NumBytes), NumBytesRead, hFile);

return 0; /* Ok */
}

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("中文", 160, 80);
/* Display hint */
GUI_SetFont(&GUI_Font13_ASCII);
GUI_DispStringHCenterAt("Press any key to continue...", 160, 120);

/* Delete XBF font and clear display */
GUI_XBF_DeleteFont(&Font);
}
main{

FILE *fin;
fin = fopen ("M:\\cht.bdf","r");
if (fin != NULL)
{
_ShowXBF(&fin);
fclose (fin);
}else{
printf ("\nFile not found!\n");
fclose (fin);
}
}

but it run in _cbGetData will be crash ,but if i del all code in _cbGetData

ex:
static int _cbGetData(U32 Off, U16 NumBytes, void * pVoid, void * pBuffer) {
unsigned long NumBytesRead;
FILE *hFile;
U32 fpos;


return 0; /* Ok */
}

it will not crash

i use cortex m3 EA-board lpc1788 EVB

Can you help me ,please
thank you

Dear Adrian Thank you
can you provide advicewhich file system for help me to Solve this question.

Best regards,

gary.chen

HI Adrian

i will sent maill to info@segger.com
by the way ,can you give me _cbGetData sample or example code ?
static int _cbGetData(U32 Off, U16 NumBytes, void * pVoid, void * pBuffer)

Best regards,

gary.chen

Hi Adrian
thank you ....