C / C++ / MFC

jeron1 wrote:

Not sure what 'wasted space in a file' is though.

Asmo'a wrote:

I'm making a huge assignment and a part of it want me
to see the wasted space in a file

Nelek wrote:

And why is that slack space there?

#define IsBadReadPtr(x) ((x) == NULL)
#define IsBadWritePtr(x) ((x) == NULL)

BOOL IsBadReadPointerCheck(char *p, size_t size)
{
	MEMORY_BASIC_INFORMATION mbi;
	for (void *pStop = p + size; p < pStop;p =p+mbi.RegionSize)
	{
		if(!VirtualQuery(p,&mbi,sizeof(mbi)))
		{
			return FALSE;
		}
	}
	return TRUE;
}

BOOL IsBadWritePointer(char *p, size_t size)
{
	BOOL bRet = FALSE;
	void *pStop = p+size;
	MEMORY_BASIC_INFORMATION mbi;
	for(p;p < pStop;++p))
	{
		if(VirtualQueryEx(GetCurrentProcess(),(LPVOID)p,&mbi,sizeof(MEMORY_BASIC_INFORMATION)))
		{
			if(!(((mbi.Protect & PAGE_READWRITE) == PAGE_READWRITE) || ((mbi.Protect & PAGE_EXECUTE_READWRITE) == PAGE_EXECUTE_READWRITE)))
			{
				return TRUE;
			}
		}
	}
	return bRet;
}

MEMORY_BASIC_INFORMATION mbi;
if(VirtualQueryEx(GetCurrentProcess(),(LPVOID)pInstructions,&mbi,sizeof(MEMORY_BASIC_INFORMATION)))
{
	if(mbi.Protect & PAGE_EXECUTE_READ && mbi.State & MEM_COMMIT && mbi.AllocationProtect & PAGE_EXECUTE_WRITECOPY && mbi.Type & MEM_IMAGE)
	{
		(*this.*MemberFunction)(val);
		return TRUE;
	}
}

gabbana wrote:

wfile = _wfopen(L"ReadMe.txt",L"rb");

wfile = _wfopen(L"ReadMe.txt", L"r");

gabbana wrote:

gg = (wchar_t*)malloc(sizeof(char)*num);

gg = (wchar_t*)malloc(sizeof(wchar_t)*num+1);
gg[num] =  '\0'; // so that MessageBox() will not fail

<br />
	 wchar_t *gg;<br />
<br />
	FILE *wfile;<br />
	wfile = _wfopen(L"ReadMe.txt",L"r");<br />
	fseek(wfile,0,SEEK_END);<br />
	int num = ftell(wfile);<br />
	fseek(wfile,0,SEEK_SET);<br />
<br />
	gg = (wchar_t*)malloc(sizeof(wchar_t)*num+1);<br />
	fread(gg,sizeof(wchar_t),num,wfile);<br />
	fclose(wfile);<br />
	<br />
	gg[num] =  '\0'; // so that MessageBox() will not fail<br />
	MessageBox(NULL,gg,L"file",0);<br />

char *gg = (char *) malloc(sizeof(char) * num + 1);
...
USES_CONVERSION;
LPWSTR lp = A2W(gg);
 
MessageBox(NULL, lp, _T("file"), MB_OK);