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All I know is that ‘malloc’ use to only allocate memory from the heap and MS’s older version of ‘new’ use to get the actual memory by calling ‘malloc’ before calling the C++ constructor. MS’s newest OS may not work that way any more, but testing it by allocating really huge amounts of memory may give you the answer.
May be you should check if ‘Jeffrey Rickter’ has written a new book that covers that, or may be one of his articles in MSJ mag.
Good Luck!
(There seem to be some network problems – I tried to post this 3 times, so far)
INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra
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I think that you can't be sure of that: it is the operating system that decide to store temporary part of the virtual memory on the HDD to free some resources. Probally you can't bypass that mechanism, I don't know any function to mark the pages of memory as "sensitive" and leave they on the RAM.
Sorry
Cheers,
Russell
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John R. Shaw wrote: do not know about managed code, but in unmanaged code ‘new’ and ‘malloc’ would not normally allocate virtual memory, although that may have changed. Dig through the docs and code to find out.
new and malloc do allocate virtual memory and have done since memory virtualisation was introduced.
Steve
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Hello!
seach for the concepts like RamFS, RAM disk....
http://www.superspeed.com/desktop/ramdisk.php
sanket patel
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THANK YOU ALL, FOR YOUR REPLY, I will try to find out more about ramfs,virtuallock, AWE - alocatephysicalpage
REGARDS
marcelse
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REPLY TO ALL:
Solution is AWE .... Address Windowing Extensions
it can allocate physical RAM and then map it to use...
not so straightforward but, I hope it will fit my needs..
THANKS
marcelse
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I am creating few keys in registry through MFC. Everything works well in some systems but in some systems it doesn't create, what could be the problem??
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peace of code and enumeration of system will be helpfully 
Best regards,
Baron
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But I can create registry entries manually but unable to create through code in some systems
If Admin privilages would be the problem how do i give permission to create registry entries through code?
The code what i have written is:
DWORD dwMaxLength = MAX_COMPUTERNAME_LENGTH + 1;
char szComputerName[MAX_COMPUTERNAME_LENGTH + 1];
GetComputerName(szComputerName, &dwMaxLength);
HKEY hHeadKey;
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Database", 0, KEY_QUERY_VALUE,&hHeadKey) == ERROR_SUCCESS)
TRACE("Key exists in registry");
else if (RegConnectRegistry(szComputerName,HKEY_LOCAL_MACHINE,&hHeadKey) == ERROR_SUCCESS)
{
HKEY hSubKey1, hSubKey2;
if (RegCreateKeyEx(hHeadKey,"SOFTWARE\\Database",0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&hSubKey1,NULL) == ERROR_SUCCESS)
{
CString str = "SOME TEXT";
RegSetValueEx(hSubKey1,"Key1",0,REG_SZ,(const unsigned char *)(LPCSTR)str,str.GetLength() + 1);
}
if (RegCreateKeyEx(hHeadKey,"SOFTWARE\\Database",0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&hSubKey2,NULL) == ERROR_SUCCESS)
{
CString str = "SOME TEXT";
RegSetValueEx(hSubKey2,"Key2",0,REG_SZ,(const unsigned char *)(LPCSTR)str,str.GetLength() + 1);
}
}
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Change KEY_ALL_ACCESS on KEY_WRITE. In some OS like Win2000 it was help
Best regards,
Baron
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Thank you Baron I'll check it.
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The user running your application doesn't have permission to create registry entries, would be my guess.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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But I can create registry entries manually but unable to create through code in some systems
If Admin privilages would be the problem how do i give permission to create registry entries through code?
The code what i have written is:
DWORD dwMaxLength = MAX_COMPUTERNAME_LENGTH + 1;
char szComputerName[MAX_COMPUTERNAME_LENGTH + 1];
GetComputerName(szComputerName, &dwMaxLength);
HKEY hHeadKey;
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Database", 0, KEY_QUERY_VALUE,&hHeadKey) == ERROR_SUCCESS)
TRACE("Key exists in registry");
else if (RegConnectRegistry(szComputerName,HKEY_LOCAL_MACHINE,&hHeadKey) == ERROR_SUCCESS)
{
HKEY hSubKey1, hSubKey2;
if (RegCreateKeyEx(hHeadKey,"SOFTWARE\\Database",0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&hSubKey1,NULL) == ERROR_SUCCESS)
{
CString str = "SOME TEXT";
RegSetValueEx(hSubKey1,"Key1",0,REG_SZ,(const unsigned char *)(LPCSTR)str,str.GetLength() + 1);
}
if (RegCreateKeyEx(hHeadKey,"SOFTWARE\\Database",0,NULL,REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL,&hSubKey2,NULL) == ERROR_SUCCESS)
{
CString str = "SOME TEXT";
RegSetValueEx(hSubKey2,"Key2",0,REG_SZ,(const unsigned char *)(LPCSTR)str,str.GetLength() + 1);
}
}
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I haven't dug very deep into your code, but everyone of the registry functions returns an error code; use it, it would probably tell you what the error is.
Use the TRACE macro to know where it fails and what the error code is. For your own convenience I suggest you also use ::FormatMessage(...) and write the system error message instead of a hex number. See here[^].
Are you able to connect to the remote registry where it doesn't work and what OS version is running on the remote system?
OT: please use the <pre> tags when you're posting code.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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Thank you for the suggestion.
The OS where I am creating registry entries is Windows NT.
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requesting the regsam=KEY_ALL_ACCESS will fail if your user is not an administrator.
This behavior is modified on Vista but that's a story for another day...
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Hello,
Suppose I have
vector<CString>StringVector
vector<int>IntVector
If I have above strutures in my program then do I need to worry that CString will take up variable number of bytes for each member of the vector and it may cause problems while accessing data in the vector
As otherwise each member in the IntVector is going to take up equal number of bytes so accessing member from IntVector is fine.
Please tell me whether I should take care while making a vector of CStrings .
Prithaa
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prithaa wrote: Please tell me whether I should take care while making a vector of CStrings
Use 'iterator's for accessing the objects stored in the vector and forget about the difficulties in accessing those..
Do your Duty and Don't expect the Result
Rate this Post, if I helped You
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No, you don't have to worry about that because the CString object contain a pointer to the real buffer array.
But I'm wondering why you are using CString with the STL ? Why don't you use std::string to keep consistent ?
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because std::vector is better than MFC's containers maybe ?! 
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toxcct wrote: because std::vector is better than MFC's containers maybe ?!
Yes, but I said: Why don't you use std::string to keep consistent ?
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because CString is easier to use than std::string ? 
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Errr... Well, I don't have anything more to add 
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Cedric Moonen wrote: Errr... Well, I don't have anything more to add
thanksfully, cause i didn't have further arguments either
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