内存映射怎么可以跨用户共享使用？

[xuxingok]

需要内存映射给不同的用户共同使用，可是不行~
hMapping=CreateFileMapping((HANDLE)0xFFFFFFFF,NULL,PAGE_READWRITE,0,0x100,"MYSHARE");
lpData=(LPSTR)MapViewOfFile(hMapping,FILE_MAP_ALL_ACCESS,0,0,0);
有什么好办法啊
谢谢！

[healer_kx]

marK，跨用户哎~

[zyq5945]

Terminal Services: The name can have a "Global\" or "Local\" prefix to explicitly create the object in the global or session namespace. The remainder of the name can contain any character except the backslash character (\). Creating a file mapping object in the global namespace requires the SeCreateGlobalPrivilege privilege. For more information, see Kernel Object Namespaces.

hMapping=CreateFileMapping((HANDLE)0xFFFFFFFF,NULL,PAGE_READWRITE,0,0x100,"Global\\MYSHARE"); 

[yangyang__]

用一个真实的文件作为后存存储器,而不是用页交换文件(0xFFFFFFFF).

HANDLE hFile=CreateFile(...);
if(hFile!=0xFFFFFFFF)
{
   hMapping=
       CreateFileMapping((HANDLE0xFFFFFFFF,NULL,PAGE_READWRITE,0,0x100,"MYSHARE"); 
   lpData=(LPSTR)MapViewOfFile(hMapping,FILE_MAP_ALL_ACCESS,0,0,0);
}

楼主试试行不行,我没有亲自动手实验过,不保证一定可行.

[yangyang__]

上面代码错了,直接拷了楼主的了,忘了改了,不好意思.
应该这样:

HANDLE hFile=CreateFile(...);
if(hFile!=0xFFFFFFFF)
{
   hMapping=CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,0x100,"MYSHARE"); 
   lpData=(LPSTR)MapViewOfFile(hMapping,FILE_MAP_ALL_ACCESS,0,0,0);
}

[wangk]

A.使用全局名称
B.设置所有用户可用的安全属性（CreateFileMapping的第二个参数）

[oyljerry]

采用Global全局属性...

[MoXiaoRab]

#2很强大

[havedown]

支持6楼。

[xuxingok]

[Quote=引用 5 楼 wangk 的回复:]
A.使用全局名称
B.设置所有用户可用的安全属性（CreateFileMapping的第二个参数）
[/Quote]

能说详细些吗
第二个参数怎么写？

[rendao0563]

#include <windows.h>
#include <stdio.h>
#include <conio.h>

#define BUF_SIZE 256
TCHAR szName[]=TEXT("Global\\MyFileMappingObject");
TCHAR szMsg[]=TEXT("Message from first process");

void main()
{
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 || hMapFile == INVALID_HANDLE_VALUE)
{
printf("Could not create file mapping object (%d).\n",
GetLastError());
return;
}
pBuf = (LPTSTR) MapViewOfFile(hMapFile, // handle to map object
FILE_MAP_ALL_ACCESS, // read/write permission
0,
0,
BUF_SIZE);

if (pBuf == NULL)
{
printf("Could not map view of file (%d).\n",
GetLastError());
return;
}


CopyMemory((PVOID)pBuf, szMsg, strlen(szMsg));
getch();

UnmapViewOfFile(pBuf);

CloseHandle(hMapFile);
}

[rendao0563]

#include <windows.h> 
#include <stdio.h> 
#include <conio.h> 

#define BUF_SIZE 256 
TCHAR szName[]=TEXT("Global\\MyFileMappingObject"); 
TCHAR szMsg[]=TEXT("Message from first process"); 

void main() 
{ 
  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 || hMapFile == INVALID_HANDLE_VALUE) 
  { 
      printf("Could not create file mapping object (%d).\n", 
            GetLastError()); 
      return; 
  } 
  pBuf = (LPTSTR) MapViewOfFile(hMapFile,  // handle to map object 
                        FILE_MAP_ALL_ACCESS, // read/write permission 
                        0,                  
                        0,                  
                        BUF_SIZE);          

  if (pBuf == NULL) 
  { 
      printf("Could not map view of file (%d).\n", 
            GetLastError()); 
      return; 
  } 

  
  CopyMemory((PVOID)pBuf, szMsg, strlen(szMsg)); 
  getch(); 

  UnmapViewOfFile(pBuf); 

  CloseHandle(hMapFile); 
} 

[rendao0563]

#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <windows.h>

#define BUF_SIZE 256
TCHAR szName[]=TEXT("Global\\MyFileMappingObject");

void main()
{
   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) 
   { 
      printf("Could not open file mapping object (%d).\n", 
             GetLastError());
      return;
   } 
 
   pBuf = MapViewOfFile(hMapFile,    // handle to mapping object
               FILE_MAP_ALL_ACCESS,  // read/write permission
               0,                    
               0,                    
               BUF_SIZE);                   
 
   if (pBuf == NULL) 
   { 
      printf("Could not map view of file (%d).\n", 
             GetLastError()); 
      return;
   }

   MessageBox(NULL, pBuf, TEXT("Process2"), MB_OK);

   UnmapViewOfFile(pBuf);

   CloseHandle(hMapFile);
}

[蒋晟]

http://topic.csdn.net/t/20020813/13/936659.html

[xuxingok]

谢谢大家！
问题解决!

[jasonM2008]

来MARK此贴！