Why this error? The Shared memory is set to 0-CodePudding

No problem when the Shared memory size set to 1024, when set to 10 * 1024 in meset error here, why?

CodePudding user response:

The

refer to the original poster ForgetTomorrow response:

No problem when the Shared memory size set to 1024, when set to 10 * 1024 in meset error here, why?

Debugging found only 4 * 1024 size, again big

CodePudding user response:

According to the integer times of system page 1, 2 the returned handle & amp; Buffer pointer to determine whether effective

SYSTEM_INFO sysInfo.
GetNativeSystemInfo (& amp; The sysInfo);
Int BUF_SIZE=102400 * sysInfo. DwPageSize;

CodePudding user response:

refer to the second floor zgl7903 response:

1 integer times to deal with according to the system page 2 the returned handle & amp; Buffer pointer to determine whether effective

SYSTEM_INFO sysInfo.
GetNativeSystemInfo (& amp; The sysInfo);
Int BUF_SIZE=102400 * sysInfo. DwPageSize;

To the 4096 crash

CodePudding user response:

Windows system has to the Shared memory size limit? I can only be set to 1 KB, greater than 1 KB access errors

CodePudding user response:

 


Int Test () 
{
Int iErr=0; 

TCHAR szName []=TEXT (" Global \ \ MyFileMappingObject "); 

SYSTEM_INFO sysInfo. 
GetNativeSystemInfo (& amp; The sysInfo); 
Int BUF_SIZE=102400 * sysInfo. DwPageSize; 

HANDLE hMapFile=NULL; 
LPVOID pbufs=NULL; 

Do 
{
HMapFile=CreateFileMapping (
INVALID_HANDLE_VALUE,//use the paging file 
NULL,//the default security 
PAGE_READWRITE,//read/write access 
0,//Max. Object size 
BUF_SIZE,//buffer size 
SzName);//the name of the mapping object 

If (hMapFile!=NULL) 
{
Printf (" CreateFileMapping % d (bytes) ok \ n ", BUF_SIZE); 
} 
The else 
{
IErr=GetLastError (); 
Printf (" Could not create the file mapping object (% d). \ n ", iErr); 
break; 
} 

Pbufs=MapViewOfFile (hMapFile,//handle to the map object 
FILE_MAP_ALL_ACCESS,//read/write permission 
0, 0, 0); 

If (pbufs==NULL) 
{
IErr=GetLastError (); 
Printf (" Could not map to the view of the file (% d). \ n ", iErr); 
break; 
} 

For (LONG I=0; i{
((BYTE *) pbufs) [I]=(BYTE) I; 
} 

Printf (" Write done \ n "); 

_getch (); 

} while (0); 

If (pbufs!=NULL) 
{
UnmapViewOfFile (pbufs); 
Pbufs=NULL; 
} 

If (hMapFile!=NULL) 
{
The CloseHandle (hMapFile); 
HMapFile=NULL; 
} 

Return iErr; 
}