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The whole statement is unreasonable, because it pretends to invalidate the C++ polymorphism because of, general classes cannot exploit polymorphism from a given one without modifications (i.e. deriving from).
But I have to admit, it is not crystalline concept (it simply express author's point of view...)
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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Thanks CPallini,
Do you mean modify the derived class to declare it to inherit from some specific base class? In this senses, we can say it "modifies" something, or in other words, if we can not modify like this, we can not use polymorphism?
regards,
George
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Hi Everyone,
I write one ActiveX controls.but i dont know how to make that activex control in a single file.Like VB we have Option Make an Ocx file in file menu. so in VC++ also do we have any option to make an activeXcontrol like that. Please REPLY ME SOON.
THANKS IN ADVANCE,
savitri.
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savitri wrote: I write one ActiveX controls.but i dont know how to make that activex control in a single file.Like VB we have Option Make an Ocx file in file menu. so in VC++ also do we have any option to make an activeXcontrol like that
Did you choose the project option for creating an ActiveX control. If yes, than when you compile your code a .ocx file would be generated as output.
savitri wrote: Please REPLY ME SOON.
I hope this solution helps you and was posted SOON.
Somethings seem HARD to do, until we know how to do them.
 _AnShUmAn_
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savitri wrote: Please REPLY ME SOON.
Please hold your breath until I get back to you.
Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP
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Hello,
Using below code i am trying to authorize user "Valid\User1" to create COM object of "TestServiceSecurity" from a remote machine.
This code is working fine that is it not throwing any kind of error but still it is not giving autorization to "User1".
Can anybody help me with this?
Thanks in advance.
*************************************************************************************************************************
BOOL bDaclPresent = FALSE;
BOOL bDaclDefaulted = FALSE;
DWORD dwError = 0;
DWORD dwSize = 0;
EXPLICIT_ACCESS ea;
PACL pacl = NULL;
PACL pNewAcl = NULL;
PSECURITY_DESCRIPTOR psd;
SC_HANDLE schManager = NULL;
SC_HANDLE schService = NULL;
SECURITY_DESCRIPTOR sd = {0};
SERVICE_STATUS_PROCESS ssp;
DWORD dwBytesNeeded;
PSID sid;
schManager = OpenSCManager(0, 0, SC_MANAGER_CONNECT);
if (schManager == NULL)
DisplayError(GetLastError(), TEXT("OpenSCManager"));
schService = OpenService(schManager , "TestServiceSecurity",SC_MANAGER_ALL_ACCESS);
if (schService == NULL)
DisplayError(GetLastError(), TEXT("OpenService"));
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY, dwSize);
// Get the current security descriptor.
BOOL bResult = QueryServiceObjectSecurity(schService, DACL_SECURITY_INFORMATION, psd, 0, &dwSize);
if (!bResult)
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY, dwSize);
if (psd == NULL){
DisplayError(0, TEXT("HeapAlloc"));
// note HeapAlloc does not support GetLastError()
}
bResult = QueryServiceObjectSecurity(schService, DACL_SECURITY_INFORMATION, psd, dwSize, &dwSize);
if(!bResult)
DisplayError(GetLastError(), TEXT("QueryServiceObjectSecurity"));
}
else
DisplayError(GetLastError(), TEXT("QueryServiceObjectSecurity"));
}
// Get the DACL.
bResult = GetSecurityDescriptorDacl(psd, &bDaclPresent, &pacl, &bDaclDefaulted);
if (!bResult)
DisplayError(GetLastError(), TEXT("GetSecurityDescriptorDacl"));
// Build the ACE.
BuildExplicitAccessWithName(&ea, TEXT("Valid\\User1"), COM_RIGHTS_EXECUTE,
SET_ACCESS, NO_INHERITANCE);
dwError = SetEntriesInAcl(1, &ea, pacl, &pNewAcl);
if (dwError != ERROR_SUCCESS)
DisplayError(dwError, TEXT("SetEntriesInAcl"));
//AddAccessAllowedACEToACL(
bool bIsValidACL = IsValidAcl(pacl);
// Initialize a NEW Security Descriptor.
bResult = InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION);
if (!bResult)
DisplayError(GetLastError(), TEXT("InitializeSecurityDescriptor"));
// Set the new DACL in the Security Descriptor.
bResult = SetSecurityDescriptorDacl(&sd, TRUE, /*pNewAcl*/NULL, FALSE);
if (!bResult)
DisplayError(GetLastError(), TEXT("SetSecurityDescriptorDacl"));
// Set the new DACL for the service object.
bResult = SetServiceObjectSecurity(schService, DACL_SECURITY_INFORMATION, &sd);
if (!bResult)
DisplayError(GetLastError(), TEXT("SetServiceObjectSecurity"));
// Close the handles.
bResult = CloseServiceHandle(schManager);
if (!bResult)
DisplayError(GetLastError(), TEXT("CloseServiceHandle"));
bResult = CloseServiceHandle(schService);
if (!bResult)
DisplayError(GetLastError(), TEXT("CloseServiceHandle"));
// Free buffers.
LocalFree((HLOCAL)pNewAcl);
HeapFree(GetProcessHeap(), 0, (LPVOID)psd);
void DisplayError(DWORD dwError, LPTSTR pszAPI)
{
LPVOID lpvMessageBuffer;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL, dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpvMessageBuffer, 0, NULL);
//Now display this string.
_tprintf(TEXT("ERROR: API = %s.\n"), pszAPI);
_tprintf(TEXT(" error code = %u.\n"), dwError);
_tprintf(TEXT(" message = %s.\n"),
(LPTSTR)lpvMessageBuffer);
// Free the buffer allocated by the system.
LocalFree(lpvMessageBuffer);
ExitProcess(dwError);
}
*************************************************************************************************************************
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Hai all,
my application should share same registry entry for diffrent users of same privilage In Vista. Please let me know if you have any idea.
regards
vicky00000
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store it under LOCALMACHINE in the registry and add a new usergroup that you put all the users you want to be able to read/write the registry keys it into that usergroup and then set the ACL for that registry entrie so that that group has full access to it.
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hi,is there a tool which can monitor the specified IO data translation?
I need a tool which can monitor the data translation between one program and the CDROM,not only the action but also the data they exchange each other.
thanks
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Hi, all
<br />
CString cstr = "abcd";<br />
<br />
LPTSTR p = cstr.GetBuffer();<br />
<br />
p[2] = 'r';<br />
<br />
<br />
I want to change 'c' to 'r' in cstr.
How to do?
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hanlei0000000009 wrote: // cstr is abcd, but not is abrd
CString cstr = "abcd";<br />
cstr.SetAt( 2,'r');
hanlei0000000009 wrote: I want to change 'c' to 'r' in cstr.
But your purpose is to replace the c with r, you can use the Replace function..
CString cstr = "abcd";<br />
cstr.Replace( 'c','r');
modified on Thursday, March 27, 2008 11:37 PM
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You rarely need to use GetBuffer(). The CString class has most functions you need, including SetAt()...
CString cstr = _T("abcd");
cstr.SetAt(2, _T('r'));
If you insist on using GetBuffer(), remember:
"If you use the pointer returned by GetBuffer to change the string contents, you must call ReleaseBuffer ..."
CString cstr = _T("abcd");
LPTSTR p = cstr.GetBuffer();
p[2] = _T('r');
cstr.ReleaseBuffer();
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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Someone said to me that in the next version of MFC, this function would be renamed to GetBufferIReallyKnowWhatImDoing()
Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP
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..and they will also add the method PlzGetBuf, always throwing by design.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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CPallini wrote: ..and they will also add the method PlzGetBuf, always throwing by design.
One more GiveMeBufOtherwiseOsama
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You/codeProject$$>
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CPallini wrote: PlzGetBuf
Does it take a boolean parameter too? PlzGetBuf(BOOL bUrgent) 
Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP
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Rajesh R Subramanian wrote: Does it take a boolean parameter too? PlzGetBuf(BOOL bUrgent)
Actually it does, however it is optional:
PXSTR PlzGetBuf(BOOL bUrgent = TRUE);
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
|
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|
|
Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP
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i will take ReleaseBuffer revenge!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You/codeProject$$>
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I have to make a login screen for my application. and how do i do validation for this? the application that i am planning to do is an MDI. now the first thing when the exe is called the login screen should appear. so where should i call this dialog box?
if somebody can give me a link tht will lead to an example that would help me a lot.
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Chandrasekharanp wrote: where should i call this dialog box?
It could be the first window you create and show, or you could create your "main" window
hidden and show the dialog after creating the main window.
Same as creating any window - you control when windows are created and made visible.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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ok.. let me make it more clear..
when u click the exe the first screen tat will appear will be the login screen.. once the login and password is right the applications first window appears..
i hope its clear.. and i could not find any articles with login and password examples.
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That's clear.
What's not clear to me is what you're having trouble with.
You can pop up a modal dialog when your app starts running.
If the login fails you exit the app or loop and show the dialog again.
If the login succeeds, create the MDI window.
That's one way to do it. FWIW, that's what I do in my apps.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: You can pop up a modal dialog when your app starts running.
that is my requirement.. how do i do that?
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