Re: Reading a file.
- From: "Bruce Eitman [eMVP]" <bruce.eitman.nospam@xxxxxxxxxxxxxxxxxxx>
- Date: Fri, 27 Jun 2008 16:04:45 -0400
Just to be more clear. ReadFile() reads what you wrote to the file, it does
not process the data to interpret the data. So if ReadFile() reads a 0x39,
then that is what is stored in the file.
--
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT EuroTech DOT com
My BLOG http://geekswithblogs.net/bruceeitman
EuroTech Inc.
www.EuroTech.com
"Bruce Eitman [eMVP]" <bruce.eitman.nospam@xxxxxxxxxxxxxxxxxxx> wrote in
message news:OLLR7qI2IHA.2188@xxxxxxxxxxxxxxxxxxxxxxx
No, your intrepetation of what is happening must be wrong.
Again, how did you write the file? If you open the file in an editor, and
you see a 9, then you did not write a 0x09, you wrote a 0x39
--
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT EuroTech DOT com
My BLOG http://geekswithblogs.net/bruceeitman
EuroTech Inc.
www.EuroTech.com
"ashishedn" <ashishedn@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:CA7247F3-89CA-4648-BF19-555C5AFAF367@xxxxxxxxxxxxxxxx
Problem is when i am reading a file through "readfile" function,it is
being
read in character format.Suppose a value "9" is read,then it would get
stored
in memory as "0x39" and i would be getting "0011 1001" instead of "0000
1001".
so the question is whether with "readfile" function a value could be read
in
decimal format?
"Bruce Eitman [eMVP]" wrote:
You may have said something before, just not clear enough for the rest
of to
understand what your problem is, and you still haven't done a very good
job
of it.
Could it be that you saved the file with something like "%X", data? And
so
now you need to convert it?
As I stated before: Then explain better what you expect and what is
actually happening.
--
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT EuroTech DOT com
My BLOG http://geekswithblogs.net/bruceeitman
EuroTech Inc.
www.EuroTech.com
"ashishedn" <ashishedn@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:50323539-6D7B-45E0-B096-7DAB20E80E65@xxxxxxxxxxxxxxxx
That i have already tried.what is happening,if i fill data to the
buffer
as
integers then it is showing correct value.However,if data filled to
the
buffer is character values, then in memory ASCII values are displayed.
But,for our main application, in both the cases(defining buffer as set
of
integers/characters) ASCII values are coming.Therefore,i can't get
correct
bitwise information as told earlier.
"Bruce Eitman [eMVP]" wrote:
Huh?
What is the problem? Reduce this a little, I suspect that it has
nothing
to
do with "reading a file".
What happens if you take a array and fill it with hard coded data,
then
do
the operation? Doing so might help you understand what is going on,
and
certainly would help me understand.
Then explain better what you expect and what is actually happening.
--
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT EuroTech DOT com
My BLOG http://geekswithblogs.net/bruceeitman
EuroTech Inc.
www.EuroTech.com
"ashishedn" <ashishedn@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:C59D4C87-F2BA-405A-AC4A-2FE26532C29D@xxxxxxxxxxxxxxxx
Hi,
I am trying to read data from a file to a buffer.Then, i want to
store
bitwise information of a particular byte to a different array.
Problem in doing so is, in memory, ASCII value of a character is
getting
stored and right shifting that value would't give the correct
bitwise
information.
Pl. help.
Code written for that is.
#include "stdafx.h"
bool hw[4][8][8];
int WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
unsigned char inBuffer[256];
unsigned char i,j,k;
DWORD noofbytes = 0x00000001,nBytesRead;
HANDLE hservice = CreateFile(L"\\hi.txt",GENERIC_READ,0,NULL,
OPEN_EXISTING,0,NULL);
DWORD d = GetLastError();
if(hservice != INVALID_HANDLE_VALUE)
{
DWORD dwPtr = SetFilePointer(hservice,0x00,NULL,FILE_CURRENT);
if(dwPtr == 0xFFFFFFFF)
{
printf("Pointer set error = %ul\n",GetLastError());
// return 0;
}
else
{
BOOL bResult =
ReadFile(hservice,&(inBuffer[i]),noofbytes,&nBytesRead,NULL);
DWORD d = GetLastError();
if(bResult && (nBytesRead == 0x01))
printf("Read Value = %x\n",inBuffer[i]);
else
printf("Error in Reading = %ul\n",d);
}
}
else
printf("Error in opening the file = %ul",d);
for(k=0;k<8;k++)
{
// printf("value of in Buffer = %d\n",inBuffer[j]);
if(inBuffer[0]>>k & 0x01)
hw[0][0][k] = TRUE;
else
hw[0][0][k] = FALSE;
printf("Value of hw[0][0][%d] = %d\n",k,hw[0][0][k]);
}
return 0;
}
.
- References:
- Reading a file.
- From: ashishedn
- Re: Reading a file.
- From: Bruce Eitman [eMVP]
- Re: Reading a file.
- From: ashishedn
- Re: Reading a file.
- From: Bruce Eitman [eMVP]
- Re: Reading a file.
- From: ashishedn
- Re: Reading a file.
- From: Bruce Eitman [eMVP]
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