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I'm working with "bsearch", a binary sort program. I am experimenting a bit for the sake of learning. I have replaced all of the "int" prototypes with "double" to enable decimals. For some reason I get the follwing error message when I compile. I'm sure it's a simple mistake, but I can't find it.
Compiling...
jjjmn.cpp
C:\Program Files\Microsoft Visual Studio\MyProjects\Exodus\jjjmn.cpp(20) : error C2664: 'bsearch' : cannot convert parameter 5 from 'double (const void *,const void *)' to 'int (__cdecl *)(const void *,const void *)'
None of the functions with this name in scope match the target type
Error executing cl.exe.
pppp.exe - 1 error(s), 0 warning(s)
below is the program...
----------------------------------------------------
/* bsearch example */
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
double values[] = { 10.1, 20.4, 25.6, 40.3, 90.7, 100.4 };
double compare (const void * a, const void * b)
{
return ( *(double*)a - *(double*)b );
}
double main ()
{
double * pItem;
double x;
cout<<"enter your number when ready.";
cin>>x;
double key = x;
pItem = (double*) bsearch (&key, values, 6, sizeof (double), compare);
if (pItem!=NULL)
printf ("%d is in the array",*pItem);
else
printf ("%d is not in the array",key);
return 0.0;
}
-------------------------------------------------------
thanks
VC++ 6.0
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You're a little confused on how the compare function is used by bsearch. The compiler is complaining becuase your compare function is returning a double, not an int. You can not change the return type to double, rather change your compare function to something like :
int compare( const void *a, const void *b )
{
if( *(double*)a < *(double*)b ) return(-1);
if( *(double*)a > *(double*)b ) return( 1);
return(0);
}
...cmk
Save the whales - collect the whole set
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DaveE9th wrote:
I'm working with "bsearch", a binary sort program.
Searching and sorting are completely different things. bsearch() searches, and qsort() sorts.
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Hi all !
Does anyone know how to block outgoing connection ??
I need some info to make firewall
Thanks
Good luck VitSoft
My Home
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how can i free memory use by a static linked dll-function. The problem:
i call dynamic an dll function(1). This function call an static linked dll function(2). Now when I try to free the dynamic libary (FreeLibary) I get an errorcode (GetLastError = 6). I think there is a problem with the linked function....
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Error 6 = ERROR_INVALID_HANDLE.
Do you have something like:
HMODULE hModule = LoadLibrary(...);
if (NULL != hModule)
{
fp = GetProcAddress(hModule, ...);
if (NULL != fp)
(fp)(function params here);
FreeLibrary(hModule);
}
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Yes, in my application i use a dynamic call like yours....
But in my dll (first dll) i use a static linked dll (second dll, called from first dll)
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It helps to use common terminology when describing a problem. Implicit linking is done at link time. Explicit linking is done at run time via LoadLibrary(), GetProcessAddress(), and FreeLibrary(). In the case of the latter, be aware of a hazard (from MSDN):
If the DLL has a DllMain() entry point function, the operating system calls the function in the context of the thread that called LoadLibrary(). The entry-point function is not called if the DLL is already attached to the process because of a previous call to LoadLibrary() with no corresponding call to the FreeLibrary() function. Explicit linking can cause problems if the DLL is using a DllMain() function to perform initialization for each thread of a process because threads existing when LoadLibrary() (or AfxLoadLibrary()) is called will not be initialized.
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AnTri wrote:
static linked dll-function
That's the problem. You can free DLL's that you load with LoadLibrary by using FreeLibrary, but libraries that are implicitly loaded (e.g., you don't call LoadLibrary, you just have your DLL linked into your application) are, AFAIK, always loaded.
"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity." - Albert Einstein
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hi,
i started a little project and have little knowledge of c++ yet.
can someone explain me the basic steps to get access to the memory area of a certain process and write a few bytes, please?
i'm on win2000 here, but it would be nice if it works in w9x, too.
So, how do i get the base address of a process memory area?
i hope the memory i want to write is not protected, but i'll see.
thx in advance,
raffa
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Some ideas off the top of my head: You can use memory mapped files or DDE or pipes or GlobalAlloc with the GMEM_SHARE flag or use Atoms or window messages.
onwards and upwards...
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Take a look at this article:
http://www.codeproject.com/csharp/minememoryreader.asp
It's c#, but it uses win32 api.
regards
modified 12-Sep-18 21:01pm.
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thank you very much, thats the information i didnt find.
(searching the msdn can be pain in the arse 
so back to work...
:up:
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anyone know where I can find some coded audio wave compression algorithms? I'm looking to implement a wave compression program and I've found a couple of algorithms, but I'm trying to find a coded example so that I have something to work from.
It should include Predictor, Rice coding, and Lossless compression.
any suggestions are greatly appreciated. thanks!
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Now i have the task to transfer document to PDF. For i should use the Chinese or Japanese font in the PDF, what should i do?
I look up the PDF Reference from Adobe website, but about the font using in the PDF i still do no know very well, especially the Chinese or Japanese font, did everybody know where have the correspoing article or material i could refer to?
Welcome any suggestion!
Thk u for ur help
Good Luck
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As a native english speaker I have no idea what you are asking please revise your question. Do you need to create a pdf file from some other format? Are you trying to change the font in an existing PDF file? Do you have a copy of Adobe PDF Writer??
John
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Looks like he wants to find out how to use Chinese/Japanese characters in PDF files, if they are supported, etc.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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I got brain cramp reading his question trying to guess what he was asking for. I thhought if he could explain it better someone would be able to answer...
jdunlap wrote:
if they are supported
I know they are supported. I have seen PDFs with Japanese fonts.
John
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Sorry for my poor english.
My question:
1. I need to write the code to transfer document to pdf.
2. And in our documents, need display Chinese or Japanese font
3. I need help, how can i implement the Chinese or Japanese font in PDF,such as Shift-jis charset.
Good Luck
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hello friends,
Can any one tell me how can i programatically get the
SERVICE PACK installed on the Operating System.
I am working in VC6.0 enviroment.
i mean i want to know which is Service pack is installed for eg service pack 6a on NT4
Please Please
if anyone can help me....
Thanx in Advance
TAKE CARE
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http://www.naughter.com/dtwinver.html[^]
[EDIT]
I know it is not clearly stated but it will also determine the service pack #. Run winver32.exe to see the result. The test program is in test.cpp.
[/EDIT]
John
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Call GetVersionEx() and look at the szCSDVersion member of the OSVERSIONINFO struct. It will be set to "Service Pack n"
--Mike--
"I'm working really, really fast at the moment, so a 3 minute outage becomes, due to time dilation, a 5 minute outage."
-- Chris Maunder, relativistic system administrator
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
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Hi, everyone!
In a C style project, I think the advantage of a global static function
is its speed. But does it have any limitations? (Thread safety?)
If it does not have any limitations, I will define all of my global functions
and global variables as static.
Can anyone give me some advice of using global static function and global
static variable? Both advantage and limitations.
Thanks in advance,
George
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George2 wrote:
advantage of global static function
is its speed
How do you know that?
From what I understand there is no difference in "C" whatsoever between global and static, except for linking.
In "C++" static is a tricky thing because of the order or instantiation etc for the variable. However "good" "C++" should not use global variables, or functions, so static is the only other way to go.
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