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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/registry.asp
All about windows registry and how to use.
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this is a simple question, i think there is probably a simple answer. im a newb with c
i looked on google but couldnt find out what my problem was.
i have this code
for(i=0; i < something; i++) {
sprintf(filename, "%i", i);
f = fopen(filename, "w");
}
how can i make it open files like
filename1
filename2
filename3
filename4
...etc?
thanks.
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I hope this can do it:
sprintf(filename,"filename%i",i);
this is this.
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Write a routine that does the following: for a given value N, create and initialize an N*N matrix. deduce the initialization algorithm from the following examples.
Example1: N=2
1 2
4 3
Example2:N=3
1 2 3
8 9 4
7 6 5
Example3: N=4
1 2 3 4
12 13 14 5
11 16 15 6
10 9 8 7
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I doubt this is even remotely optimized, but here is a qad solution:
#define UP (UCHAR)0
#define DOWN (UCHAR)1
#define LEFT (UCHAR)2
#define RIGHT (UCHAR)3
UCHAR **Matrix( UCHAR n )
{
UCHAR **Result = new UCHAR *[n];
for ( UCHAR i = 0; i < n ; i++ )
{
Result[i] = new UCHAR[n];
memset( Result[i], 0, sizeof(UCHAR)*n );
}
UCHAR r, c;
UCHAR Dir;
UCHAR cc;
r = 0;
c = 0;
i = 1;
Dir = RIGHT;
while ( true )
{
cc = Result[c][r];
if ( cc != 0 )
{
if ( Dir == RIGHT )
{
if ( Result[c-1][r+1] == 0 )
{
Dir = DOWN;
c--;
r++;
}
else
{
break;
}
}
else
if ( Dir == DOWN )
{
if ( Result[c-1][r-1] == 0 )
{
Dir = LEFT;
c--;
r--;
}
else
{
break;
}
}
else
if ( Dir == LEFT )
{
if ( Result[c+1][r-1] == 0 )
{
Dir = UP;
r--;
c++;
}
else
{
break;
}
}
else
if ( Dir == UP )
{
if ( Result[c+1][r+1] == 0 )
{
Dir = RIGHT;
c++;
r++;
}
else
{
break;
}
}
}
Result[c][r] = i;
switch ( Dir )
{
case RIGHT:
if ( c == n - 1 )
{
r++;
Dir = DOWN;
}
else
{
c++;
}
break;
case DOWN:
if ( r == n - 1 )
{
c--;
Dir = LEFT;
}
else
{
r++;
}
break;
case LEFT:
if ( c == 0 )
{
r--;
Dir = UP;
}
else
{
c--;
}
break;
case UP:
if ( r == 0 )
{
c++;
Dir = RIGHT;
}
else
{
r--;
}
break;
}
i++;
}
for ( r = 0; r < n; r++ )
{
for ( c = 0; c < n; c++ )
{
printf( "%3u ", Result[c][r] );
}
printf( "\n" );
}
return Result;
}
int main(int argc, char* argv[])
{
Matrix( 5 );
return 0;
}
viola.
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Hi I was reading Modern C++ Design by Andrei Alexandrescu. The author mentions an interesting technique in chapter 2 where you can use template specialization to select between the overloaded functions. To try it out I had written the following code
template <int v="">
struct Int2Type
{
enum { value = v };
};
enum { SimpleDispatch = 1, ComplexDispatch = 2 };
class Dispatcher
{
private:
int m_iDispatchType;
protected:
void DoDispatch(Int2Type<simpledispatch>)
{
AfxMessageBox("Simple Dispatch called");
}
void DoDispatch(Int2Type<complexdispatch>)
{
AfxMessageBox("Complex Dispatch called");
}
public:
Dispatcher() : m_iDispatchType(SimpleDispatch)
{}
Dispatcher(int iDispatchType):
m_iDispatchType(iDispatchType)
{}
void DoDispatch()
{
DoDispatch(Int2Type<m_idispatchtype>()); -------- [1]
switch(m_iDispatchType)
{
case SimpleDispatch:
DoDispatch(Int2Type<simpledispatch>());
break;
case ComplexDispatch:
DoDispatch(Int2Type<complexdispatch>());
break;
}
}
};
unfortunately unless I comment out line marked [1] the class does not compile, to make the class compile I had to use to switch alternative. So my question is why can't I write a above code. In the book the author has taken a bool variable example which is passed as a template variable.
I am missing something here? Doesn't the use of switch makes the code behave like the standard way, I mean If I have to use switch then I do not need template specialization here.
Any help is appriciated.
Thanks
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Yep I am using VC++ 6.0.
Did microsoft fixed it in VC++ 7.0 or VC++ 7.1 ??
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Hello!
I'm working on ARM embedded device. I have Flash device mapped into memory space trough which I controll it. I have the following problem:
I have to write some 32bit data to some address in memory. When I write to the location that is not modulo of number 4, I get exception;
example:
0x01000000 - ok
0x01000001 - exception
0x01000002 - exception
0x01000003 - exception
0x01000004 - ok
How to overcome this? Is it possible to write 32 bit data in atomic way and not first upper and then lower 2 bytes?
Rostfrei
-- modified at 3:30 Thursday 20th October, 2005
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pragma pack 1 ? Haven't really thought this thru, but worth trying ~
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Can software agent be written in VB.net to control consumption of computer energy such as monitors,i.e.putting monitor in sleep mode or stand by?
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I create a server to listen the TCP command , such as HTTP command GET/POST etc.
However , I do not want to parse the command text.
How to know the client , such as IE, has completed transfering the command?
Thanks!
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According to the HTTP spec, the request is finished with an empty line, so you have to wait for a double line feed.
POST is more complicated, your server has to use the return code "100 Continue" (unless the client is HTTP/1.0) and then you'll get the POST data, though many clients send it directly and don't wait for/require the 100-Continue.
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Hello,
Can anybody help me in determining lan connectivity.
I want that whenever my lan cable is unplugged my program should be
get a notification.
With Rgds
VC++
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WebConn error LNK2019: unresolved external symbol __imp__InternetOpenA@20 referenced in function _main
My program "WebConn" keeps getting this error when ever I use items in the wininet.h class.
I'm using Visual Studio .Net 2003, C++.
Any help would be great!
Brad
<br />
#define WINVER 0x0400<br />
#include "stdafx.h"<br />
#include <windows.h><br />
#include <wininet.h><br />
<br />
int main()<br />
{<br />
HINTERNET hInternetRoot;<br />
hInternetRoot = InternetOpen("My Agent", INTERNET_OPEN_TYPE_PROXY, "127.0.0.1", "<local>",0);<br />
<br />
return 0;<br />
}<br />
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link Wininet.lib in project settings
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Hi fellows
I have the jpeglib.h included in my code to do some works with images.
When I compile, the compiler show the following message:
[Link error] undefined reference to jpeg_destroy_decompress(jpeg_decompress_struct*)
There are a lot of messages like this, all of them are Link error problems.
The jpeglib.h lies in the include folder of my Dev C++ with the jerror.h, jconfig.h.
What's going on?
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Hello,
I am making a virtual disk driver based on filedisk,
it is working very well under winxp but when i unmount the drive it doesn't disappear, instead it appears with a question mark
however it formats with all file systems under winxp.
on win 2000, it formats only under NTFS, not fat and fat32.
can u please help me with these 2 problems,
i mean the question mark under xp and the format problem under win2k
thanks in advance
Ahmed Abbas
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Where can you create your virtual drive?
ps: This question supposted to be under "Operating Systems / SysAdmin" not in C++/CLI aka managed c++
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Hi fellows
Someone knows how can I convert a BYTE to an integer?
Thanks
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You should be able to use
BYTE myByte = 4;
int myInt = (int) myByte;
There is probably some newfangled way to do this, but C-style casting usually works for me.
C++ can use cooler casting operators, just google "c++ casting." But in this case C++ casting is probably unnecessary.
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if it's a BYTE *, then int n = (int)*myBytePtr; should do it.
Christian Graus - Microsoft MVP - C++
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