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The code below is a similar method, but a little more efficient, since it only calls new twice, and it only calls delete twice.
It calls new once to create the array of pointers, and then it calls new a second time to create a single block array of the target type.
The the for loop assigns different sections of the block of array to each pointer in the pointer array.
<br />
template < typename T ><br />
T **Allocate2DArray( int nRows, int nCols)<br />
{<br />
T **ppi;<br />
T *pool;<br />
T *curPtr;<br />
<br />
ppi = new T*[nRows];<br />
<br />
pool = new T [nRows * nCols];<br />
<br />
curPtr = pool;<br />
for( int i = 0; i < nRows; i++)<br />
{<br />
*(ppi + i) = curPtr;<br />
curPtr += nCols;<br />
}<br />
return ppi;<br />
}<br />
<br />
template < typename T ><br />
void Free2DArray(T** Array)<br />
{<br />
delete [] *Array;<br />
delete [] Array;<br />
}<br />
<br />
int main()<br />
{<br />
double **d = Allocate2DArray<double>(10000, 10000);<br />
d[0][0] = 10.0;<br />
d[1][1] = 20.0;<br />
d[9999][9999] = 2345.09;<br />
Free2DArray(d);<br />
}<br />
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
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I found a page on here and interpreted the help into my program and came up with this. Tell me if this is okay...
CClass ** list = (CClass **) malloc(sizeof(CClass) * AmountOfPointers);
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That still doesn't work. A single malloc allocates a single block of memory. The fact that you are casting the pointers to the right type doesn't change that fact.
What you are asking for is this:
list[]:
+-----+ +-----------+
| [0] |-->| CClass[0] |
+-----+ +-----------+
| [1] |-->| CClass[1] |
+-----+ +-----------+
| [2] |-->| CClass[2] |
+-----+ +-----------+
| [.] |-->| CClass[.] |
+-----+ +-----------+ The code you are using is creating this:
+-----------+
-->| CClass[0] |
+-----------+
| CClass[1] |
+-----------+
| CClass[2] |
+-----------+
| CClass[.] |
+-----------+ Now, if all you really need is an array of CClass objects, the following will work:
CClass *list = (CClass *)malloc(sizeof(CClass) * AmountOfObjects); although, as I mentioned in my earlier message, this isn't a good idea since it doesn't call the CClass constructors.
Software Zen: delete this;
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Two problems:
An array of CClass* is typed as CClass** (note two asterisks).
You can't use the unsized array notation, you can only use that if you have an array initializer.
The correct code is:
CClass** lst = (CClass**) malloc ( sizeof(CClass*) * AmountOfPointers );
--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD
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Hi all,
I got a AES impelmentation code in VC++ and have some doubts, which I cannot sort out.
Will you plssssssssss let me know if u are familiar with both the AES algorithm and VC++.
So that I can forward my doubts along with the programme.
Thx...
Vendy
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hi,,
oh ok.
There is an implementation of the AES algorithm in the below link. If u download it..
http://www.thecodeproject.com/cpp/aes.asp
in Table.h
(1.) Why have they used s boxes in ‘int’s? why not
const int CRijndael::SBox[256] rather than ---const char CRijndael::SBox[256] and replace the negative values with positive?
(2.) What does
const int CRijndael::sm_T1[256] …. const int CRijndael::sm_T8[256] tables correspond to?
(3.) and const int CRijndael::sm_U1[256]…const int CRijndael::sm_U4[256] tables correspond to
(4.) also const int CRijndael::sm_shifts[3][4][2] tables correspond to?
tnx
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Friends,
I developed an application in VC++ using MFC. I like to launch it at startup. The two methods i know for this purpose are:
1) Placing shortcut in startup folder.
2) Registry enrry: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Are there other methods you know for this purpose ??
Imtiaz
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Place a shortcut to the application in the user's Startup group. Under Windows NT/2000/XP, there are two Startup groups, one for the individual user and one for 'All Users'.
Software Zen: delete this;
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Imtiaz Murtaza wrote:
Are there other methods you know for this purpose ??
See the MSDN article Q179365.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Hi,
I've got a .net dll registered for COM, which fires events. Is there any possible way to handle events fired from that dll?
Thanks in advance for any help or clue.
i.chen
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Hi.
Does anybody know how to make a executable VC++ file
with a built in dll hook?
cause i get tired of using a loader, so i wanna try this.
greetz
DP
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thnx for your reply.
i want to hook my DLL into another application.
the dll itselfs works, so i use an injector.
the problem is i want to do this in one exe which "contains" my dll, so i don't need the loader.
greetz
DP
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I would like to make a DLL with template functions and classes. How this can be done?
Thank you
DO!
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templates can be defined only in h file, so they can not be in dll.
this is c++ syntax, no other choices.
includeh10
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Templates are used by the compiler to "copy and paste" the code for datatypes that are used with a particular function. By the time it becomes a dll, there is no more need for the template.
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Hi!
I want to start/stop windows service from my C++ program. How do I do that? I searched google but found nothing 
Thanks!
Regards,
Iliya Yordanov
www.csharp-home.com - C# Resources
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To start a service, use the StartService API function. To stop, pause, or continue it, use the ControlService API function.
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I am very sorry because my english is too bad!!!
I need some code optimizer (can check and warn about run-time error in my source code).
Thank you very much!
maiquan
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Doesn't the normal Visual Studio debugger/compiler do the job?
Joel Holdsworth
Wanna give me a job this summer?
Check out my online CV and project history[^]
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Hi,
After many years, I've started developing C++ app to log into another server and perform some tasks. I'm getting the error 1314 (A required privilege is not held by the client), when I execute LogonUser function. Before I'm getting error 1300 (Not all privileges referenced are assigned to the caller), when I execute AdjustTokenPrivileges. I'm thinking that this error 1300 is triggering the error 1314. How can I get rid of these errors? FYI, I'm trying to log into my local machine with the local username/password (LOGIN/PASSWORD). This is a Win 2k pro machine, which is not part of any domain. I'm observing all these error codes while stepping thru the code in MS Visual env.
Last point is, LookupPrivilegeValue is returning an error code of 997 (Overlapped I/O operation is in progress). Could this also be causing the current problem?
Any help or pointer in resolving my current issue is greatly appreciated. Have a nice day & week ahead!
Code snippet:
char *szUserName = (char*)malloc(65);
char *szDomain = (char*)malloc(65);
char *szPassword = (char*)malloc(65);
strcpy(szUserName, "LOGIN");
strcpy(szDomain, ".");
strcpy(szPassword, "PASSWORD");
DWORD dwSize = 50+1;
char szUser[50+1]={0};
PROFILEINFO MyProfile = {0};
LUID Luid;
//The following stmt is throwing error 997 (Overlapped I/O operation is in progress)
if(!LookupPrivilegeValue(NULL, SE_TCB_NAME, &Luid))
{
OutputDebugString("LookupPrivilegeValue failed.\n");
iLastError = GetLastError();
goto Exit;
}
HANDLE hProcToken;
if(!OpenProcessToken(
GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY|TOKEN_DUPLICATE,
&hProcToken))
{
OutputDebugString("OpenProcessToken failed.\n");
iLastError = GetLastError();
goto Exit;
}
TOKEN_PRIVILEGES TokenPriv;
TokenPriv.PrivilegeCount = 1;
TokenPriv.Privileges[0].Luid = Luid;
TokenPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
//The following stmt is throwing error 1300 (Not all privileges referenced are assigned to the caller)
if(!AdjustTokenPrivileges(
hProcToken,
FALSE,
&TokenPriv,
0,
NULL,
NULL))
{
OutputDebugString("AdjustTokenPrivileges failed\n");
iLastError = GetLastError();
goto Exit;
}
// Log on as user with valid credentials for accessing the Exchange server.
//The following stmt is throwing error 1314 (A required privilege is not held by the client)
if (!LogonUser(
szUserName,
szDomain,
szPassword,
LOGON32_LOGON_SERVICE,
//LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,
&hToken))
{
OutputDebugString("LogonUser failed.\n");
iLastError = GetLastError();
goto Exit;
}
Thanx,
harish
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Hi,
It's probably stupid question,but how can i change the tabs order in my dialog?
Regards,
Eli
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In the dialog editor, just press Ctrl+D, and the current tab order is displayed with each control having a numeric label. Just click on each control in the order you want to change the order.
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