Solved

::shm_open()

Posted on 2009-05-03
3
965 Views
Last Modified: 2012-05-06
Hi,

I stuck up with 1 problem where i have to convert Unix code to Windows Code
Please help me to get replacement for following api in to Win32(Windows)

::shm_open() - is, POSIX shared memory objects created .


Thanks...
0
Comment
Question by:palhade
  • 2
3 Comments
 
LVL 12

Accepted Solution

by:
rajeev_devin earned 500 total points
ID: 24292852
You can use the function CreateFileMapping

Check this link
http://msdn.microsoft.com/en-us/library/aa366551(VS.85).aspx
0
 
LVL 86

Expert Comment

by:jkr
ID: 24296632
A little mroe details and sample code (also attached below) here: http://msdn.microsoft.com/en-us/library/aa366551(VS.85).aspx ("Creating Named Shared Memory")

Also take a look at the article at http://www.codeproject.com/KB/threads/sharedmemipc.aspx ("Interprocess Communication using Shared Memory") which cokmes wit hfull source code and explains that issue in detail.
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
 
#define BUF_SIZE 256
TCHAR szName[]=TEXT("Global\\MyFileMappingObject");
TCHAR szMsg[]=TEXT("Message from first process.");
 
int _tmain()
{
   HANDLE hMapFile;
   LPCTSTR pBuf;
 
   hMapFile = CreateFileMapping(
                 INVALID_HANDLE_VALUE,    // use paging file
                 NULL,                    // default security 
                 PAGE_READWRITE,          // read/write access
                 0,                       // max. object size 
                 BUF_SIZE,                // buffer size  
                 szName);                 // name of mapping object
 
   if (hMapFile == NULL) 
   { 
      _tprintf(TEXT("Could not create file mapping object (%d).\n"), 
             GetLastError());
      return 1;
   }
   pBuf = (LPTSTR) MapViewOfFile(hMapFile,   // handle to map object
                        FILE_MAP_ALL_ACCESS, // read/write permission
                        0,                   
                        0,                   
                        BUF_SIZE);           
 
   if (pBuf == NULL) 
   { 
      _tprintf(TEXT("Could not map view of file (%d).\n"), 
             GetLastError()); 
 
	   CloseHandle(hMapFile);
 
      return 1;
   }
 
   
   CopyMemory((PVOID)pBuf, szMsg, (_tcslen(szMsg) * sizeof(TCHAR)));
    _getch();
 
   UnmapViewOfFile(pBuf);
 
   CloseHandle(hMapFile);
 
   return 0;
}
 
--------------------------------->8-------------------------------
 
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
 
#define BUF_SIZE 256
TCHAR szName[]=TEXT("Global\\MyFileMappingObject");
 
int _tmain()
{
   HANDLE hMapFile;
   LPCTSTR pBuf;
 
   hMapFile = OpenFileMapping(
                   FILE_MAP_ALL_ACCESS,   // read/write access
                   FALSE,                 // do not inherit the name
                   szName);               // name of mapping object 
 
   if (hMapFile == NULL) 
   { 
      _tprintf(TEXT("Could not open file mapping object (%d).\n"), 
             GetLastError());
      return 1;
   } 
 
   pBuf = (LPTSTR) MapViewOfFile(hMapFile, // handle to map object
               FILE_MAP_ALL_ACCESS,  // read/write permission
               0,                    
               0,                    
               BUF_SIZE);                   
 
   if (pBuf == NULL) 
   { 
      _tprintf(TEXT("Could not map view of file (%d).\n"), 
             GetLastError()); 
 
	  CloseHandle(hMapFile);
 
      return 1;
   }
 
   MessageBox(NULL, pBuf, TEXT("Process2"), MB_OK);
 
   UnmapViewOfFile(pBuf);
 
   CloseHandle(hMapFile);
 
   return 0;
}

Open in new window

0
 
LVL 86

Expert Comment

by:jkr
ID: 24316774
???
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An Outlet in Cocoa is a persistent reference to a GUI control; it connects a property (a variable) to a control.  For example, it is common to create an Outlet for the text field GUI control and change the text that appears in this field via that Ou…
IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use while-loops in the C programming language.
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question