How can I get byte pointers to give CString values ?

[SherTeks]

I have this code snippet which writes an encrypted value of a string into a file (KEY_FILE -- #defined as C:\xyz.txt) ;

BYTE *pbBlob;
DWORD cbBlob;

:
:
:

if (!CryptExportKey(hSessionKey, hKey, SIMPLEBLOB, 0, NULL, &cbBlob))
{
dwResult = GetLastError();
MessageBox("Error CryptExportKey() failed.", "Information", MB_OK);
return;
}
if (!CryptExportKey(hSessionKey, hKey, SIMPLEBLOB, 0, NULL, &cbBlob))
{
dwResult = GetLastError();
MessageBox("Error CryptExportKey() failed.", "Information", MB_OK);
return;
}
if ((pbBlob = (BYTE *) LocalAlloc(LMEM_ZEROINIT,cbBlob)) == NULL)
{
dwResult = ERROR_NOT_ENOUGH_MEMORY;
MessageBox("Error LocalAlloc() failed.", "Information", MB_OK);
return;
}
if (!CryptExportKey(hSessionKey, hKey, SIMPLEBLOB, 0, pbBlob, &cbBlob))
{
dwResult = GetLastError();
MessageBox("Error CryptExportKey() failed.", "Information", MB_OK);
return;
}

if(hSessionKey != 0)
CryptDestroyKey(hSessionKey);

hSessionKey = 0;

FILE *fp = fopen(KEY_FILE, "w+b");
if (fp) {
fwrite(pbBlob, 1, cbBlob, fp);
fclose(fp);
}

I find a junk value written by the above code in "C:\xyz.txt" which is like :  h ¤ zÛ³Wp <ø®lŒoWP¸"Ç^1iM€ÌygUjŽæ#Eì}ÔKËëü’²ôâ  äÃr[X>¾U Since, the file contained  h ¤ zÛ³Wp <ø®lŒoWP¸"Ç^1iM€ÌygUjŽæ#Eì}ÔKËëü’²ôâ  äÃr[X>¾U string, I was expecting pbBlob to point to the above content ie.  h ¤ zÛ³Wp <ø®lŒoWP¸"Ç^1iM€ÌygUjŽæ#Eì}ÔKËëü’²ôâ  äÃr[X>¾U But when I debug, the following line fwrite(pbBlob, 1, cbBlob, fp) shows me the value of pbBlob = "||" and cbBlob = 76 What is the problem here. How can I get the junk value in a CString ? Will some kind of casting help ?

[SandipG]

Go to memory address pointed by pbBlob and have a look at the contents. Watch window will not show you full contents. and dont compare it with the contents of notepad. Open the file in VC++ IDE it will show you all hex as well as text data then compare it.

Regards, Sandip.

[RockyJames]

Enable dispaly unicode strings settings in the IDE.

[SandipG]

Is this option avaialbe in VC++6.0. Thanks a lot.

Regards, Sandip.

[RockyJames]

yes it is available.

[SherTeks]

The following code snippet worked out for me in getting the junk value (stored in the file) into a CString value.

	CString	csEncryptedString(\_T(""));
	char \*pEncryptedString = new char;

	for (INT i = 0; i < (int)cbBlob; i++)
	{
		if (pbBlob\[i\] == '\\0')
		{
			pEncryptedString\[i\] = '-';
		}
		else
		{
			pEncryptedString\[i\] = pbBlob\[i\];
		}
	}
	pEncryptedString\[cbBlob + 1\] = '\\0';

	csEncryptedString = pEncryptedString;

Thanks all for your various suggestions and support. Any other efficient code is always welcome.