Sprintf_s error function

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I have this raw code:

BOOL							bRet, bEsisPrinter;
	BYTE							*pchTesto, *pchBuffOut;
	CHAR							chBarcode[256];
	TCHAR                           chDriverName[256], chDoc[256];
	size_t							nLenBarcode;
	int                             nbytes;
	WORD                            buffLen, *pLen;
	DWORD                           cbNeeded;
	FILE                            *fp;
	HDC                             hdc;
	HANDLE                          han;
	DEVMODE                         DM;
	DOCINFO                         infsta;
	PRINTER_INFO_2                  *pprint;


<pre>WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, szBarcode, -1, chBarcode, 256, NULL, NULL);
#else
			_tcscpy_s(chBarcode, 256, szBarcode);
#endif
			nLenBarcode = strlen(chBarcode);
		{
			nbytes = strPathZebra.size();

			if (nbytes > 0)
			{
				//pchTesto = (BYTE *)calloc(nbytes + 1, sizeof(BYTE));
				CT2A temp(cs); // convert from CString to CT2A
				pchTesto = (BYTE *)(char *)temp;
				//BYTE *p = (BYTE*)(const char*)cs;
				pchBuffOut = (BYTE *)calloc(nbytes + nLenBarcode + 3, sizeof(BYTE));
				//pchTesto = pByte;
				//nbytes = (int)fread(pchFile, sizeof(unsigned char), nbytes + 1, fp);

				if (nbytes > 0)																		// Ho letto il file testo
				{
					sprintf_s((char *)pchBuffOut + 2, nbytes + nLenBarcode + 1, (char *)pchTesto, chBarcode);

I have an error with the function sprintf_s : Incorrect format specifier

What I have tried:

I tried to search on internet but I didn't find solution..

Posted 23-May-23 23:31pm

Member 14594285

Updated 24-May-23 0:12am

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2 solutions

Solution 1

You have not included a format string in your call to sprintf_s; see sprintf_s, _sprintf_s_l, swprintf_s, _swprintf_s_l | Microsoft Learn[^].

Posted 24-May-23 0:05am

Richard MacCutchan

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Member 14594285 24-May-23 6:13am

in place to (char*) pTesto?

Richard MacCutchan 24-May-23 7:00am

OK, What is contained in that string?

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Andre Oosthuizen · Accepted Answer · 2023-05-24T00:12:00

The format specifier does not match the type of the argument you're giving to it.

Format specifier %s is used to print a null-terminated string. Your chBarcode variable is declared as a CHAR array, and pchTesto is a BYTE pointer. It seems that you want to concatenate the chBarcode string to the pchTesto string - Standard C Library/Functions/printf [^].

Try the adding '%s' to your code -

sprintf_s((char *)pchBuffOut + 2, nbytes + nLenBarcode + 1, "%s%s", (char *)pchTesto, chBarcode);