C / C++ / MFC

13-Mar-07 1:27

Hi all,

I'm trying to append data to a file. I have tried the following without success:

HANDLE hFile;
char buffer[BUFSIZE];
DWORD dwBytesWritten;
DWORD nNumberOfBytesToWrite;
BOOL fSuccess;

hFile = CreateFile(TEX("C:\\testing.txt"),
		GENERIC_WRITE,
		0,
		NULL,
		OPEN_ALWAYS,
		FILE_ATTRIBUTE_NORMAL,
		NULL);

sprintf(buffer,"%s",tcpClass.transRequest);//transRequest contains the data (characters)

fSuccess = WriteFile(hFile,
	buffer,
	strlen(buffer)+1,
	&dwBytesWritten,
	NULL);

The problem is that the data doesn't append to the end of the file.
for example:
example1
example2
example3
...

Can anyone please help me.
Many Thanx
Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

James R. Twine13-Mar-07 1:42

13-Mar-07 1:42

Try using the SetFilePosition(...) function to set the "file pointer", which is the location you are reading/writing from, to the end of the file before writing to it.

Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Programm3r13-Mar-07 1:49

13-Mar-07 1:49

dwPtr = SetFilePointer (hFile, lDistance, NULL, FILE_END) ;

Yes, this would work. Would the SetFilePointer() function be used to replace the \r\n ??

Thanx for the response.
Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

James R. Twine13-Mar-07 1:58

13-Mar-07 1:58

   No. The \r\n just indicates (in a MSDOS-style text file) the end of a line. That has nothing to do with where in the file you are currently writing at.

   Think of the file like a piece of paper - after getting it, you have to decide where to start writing on it. You can either write on top of other stuff that is already there, or move to the end where there is empty space.

   Peace!

Programm3r13-Mar-07 2:08

13-Mar-07 2:08

Thank you very much James ... Helps alot Smile | :)

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Programm3r13-Mar-07 1:46

13-Mar-07 1:46

This works .... Jig | [Dance]

hFile = CreateFile(TEXT("C:\\testing.txt"),
			FILE_APPEND_DATA,
			FILE_SHARE_READ,
			NULL,
			OPEN_ALWAYS,
			FILE_ATTRIBUTE_NORMAL,
			NULL);

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Stephen Hewitt13-Mar-07 2:14

Stephen Hewitt

13-Mar-07 2:14

Why go to the trouble of using CreateFile directly? Using the standard library it's as simple as this:

// AppendFile.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include <fstream>
 
int main()
{
	using namespace std;
 
	ofstream of("C:\\Users\\Steve\\out.txt", ios::out | ios::app);
	of << "Appended me\n";
 
	return 0;
}

Steve

Programm3r13-Mar-07 2:17

problem with setting pch file

13-Mar-07 2:17

That would work, didn't think of that. Thank you very much Steve.

Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

amitmistry_petlad 13-Mar-07 1:17

amitmistry_petlad

13-Mar-07 1:17

I have made the new project from the existing one, now when I compiled the project it gives the
link error.
fatal error C1083: Cannot open include file: 'stdafx.h': No such file or directory
so for
I have set the project property to use precompile header but then it gives the same error for
.pch file.
what should I do to run my application.

Amit Mistry - petlad -Gujarat-India

Re: problem with setting pch file

Paresh Chitte13-Mar-07 1:21

Paresh Chitte

13-Mar-07 1:21

Clean and rebuild the project.

Regards,

Paresh.

Re: problem with setting pch file

James R. Twine13-Mar-07 1:39

current system time in ms

13-Mar-07 1:39

   You are missing one or more required files.

   Having an error about a missing PCH file is due to a build issue. Missing an .H file is a missing file.

   Peace!

GPU & CUDA

A_Fa13-Mar-07 0:52

A_Fa

13-Mar-07 0:52

Hi All .

In GPU & CUDA programming : What is difference between shader clock and core clock ?
thanks .

Re: GPU & CUDA

C^hris L^osinger13-Mar-07 4:15

C^hris L^osinger

13-Mar-07 4:15

different parts of the GPU run at different clock speeds.

the core clock controls the basic functions. the memory clock regulates memory access. the shader clock controls the speed of the shading section.

Google should be able to tell you more.

image processing toolkits | batch image processing | blogging

sulabh_expert@rediffmail.com13-Mar-07 0:33

sulabh_expert@rediffmail.com

13-Mar-07 0:33

i want to retrieve my current system time in milli sec

Can anybody tell me how to do it??????

Thanks in advance

toxcct13-Mar-07 0:37

toxcct

13-Mar-07 0:37

time() ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Paresh Chitte13-Mar-07 0:41

Paresh Chitte

13-Mar-07 0:41

Try SYSTEMTIME.

Regards,

Paresh.

James R. Twine13-Mar-07 0:54

13-Mar-07 0:54

   Depends on what you are really asking... What do you mean by "System Time"? Do you mean the current time as far as the system is concerned? Or do you need to know how long the system has been running?

   Do you also need millsecond resolution (where you need a feature that has millisecond resolution), or just need the results in milliseconds (where you can simply multiply a seconds value by 1000)?

   Either way, a simple search in MSDN will provide useful results.

   Peace!