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Show us the code for the wrapper. That's probably where your problem is.
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I wrote a template class that represents objects list. This is its header:
<pre>template< class T, char* filename >
class obj_list
{
public:
obj_list();
virtual ~obj_list();
void addObject(T *object);
T getObjectAt(int i);
void saveObjects();
int getNumOfObjects();
void close_file();
private:
CObList objects;
POSITION pos;
CFile objects_file;
int numOfObjects;
};</pre>
When I want to create an object of the type of this class, by writing this line:
<pre>obj_list<user_info,"user_list.dat"> users</pre>
I get this error message:
c:\my documents\tel_op3\tel_op3\info_dlg.h(19) : error C2964: invalid expression as template parameter
that point on that line
and that error message:
c:\my documents\tel_op3\tel_op3\obj_list.h(13) : error C2973: 'obj_list' : invalid template argument 'filename'
that point on the first line in the header (the one that conation '{')
The template class passes the compile without any error message.
What is wrong and how can i fix it?
Thanks in advance,
Chen.
-- modified at 6:18 Wednesday 31st August, 2005
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use the [Modify][^] link at the bottom of your post to edit it, and the, uncheck the 'Do not treat <'s as HTML tags' check box.
moreover, put the code inside a <pre></pre> block to let us benefit of the indentation...
TOXCCT >>> GEII power
[toxcct][VisualCalc]
-- modified at 6:13 Wednesday 31st August, 2005
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I can't get my delegate/event to work. It keeps giving me a compiler error of 'the specified function does not match the delegate type'. This is what I have:
...
public delegate void MessageReceivedEventHandler(MessageDetails^ Message);
...
ref class CodeProject<br />
{<br />
public:<br />
event MessageReceivedEventHandler^ MessageReceived;
...
...
CodeProject^ m_codeProject;<br />
m_codeProject->MessageReceived += gcnew MessageReceivedEventHandler(&NS::MessageReceived_Message);
...
private: System::Void MessageReceived_Message(MessageDetails^ Message);
It seems that everything is fine but it won't compile. Please help.
Thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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Is void the same as System::Void ? I doubt it.
Christian Graus - Microsoft MVP - C++
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actually it is the same when it comes to managed but I found the answer. It turns out that when I add a new event I have to pass in the class that's calling the event:
...
m_codeProject->MessageReceived += gcnew MessageReceivedEventHandler(this, &NS::MessageReceived_Message);
...
thanks!
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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hi all
i wanted to know how to implement an undo for my application?
do i have to store for every change the whole data???
if yes what if the data is too huge ??
if no , how?
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very good article Nemanja Trifunovic
" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "
- Words from Nelson Mandela
Thanks & Regards,
Gopalakrishnan
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Does anyone know a free C++ .NET complete tutorial in English or Italian? Note that I already develop with the other .NET languages...
Thanks for sugestions.
[ITA] Tozzi ha ragione: Gaia si sta liberando di noi.
[ENG] Tozzi is right: Gaia is obliterating us.
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The website doesn't work!!! 
[ITA] Tozzi ha ragione: Gaia si sta liberando di noi.
[ENG] Tozzi is right: Gaia is obliterating us.
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Now it works! Thanks
[ITA] Tozzi ha ragione: Gaia si sta liberando di noi.
[ENG] Tozzi is right: Gaia is obliterating us.
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I'm writing a project and in that project I have a class named user_info that represent
information about users. I have another class named user_list, that represent a list of
users, and use CObLis. The information that I place in the list I want to save on disk,
so i use for that serialization. The problem is that when I want to save the information,
than the program crash.
This is the header of user_info:
#include <iostream.h>
// replace with #define _CONSOLE when compiling for Windows NT
#define _DOS
#include <afx.h>
class user_info : public CObject
{
DECLARE_SERIAL(user_info)
public:
user_info();
user_info(CString suser_name,CString spassword,int suser_id,CString sname,CString sfamily_name,int suser_type,int scity_id,int sarea_id,int sonline=0);
virtual ~user_info();
// user_info() {}
user_info( const user_info &s ) // copy ctor
{ user_name = s.user_name;
password = s.password;
user_id = s.user_id;
family_name = s.family_name;
user_type = s.user_type;
city_id = s.city_id;
area_id = s.area_id;
online = s.online;
}
user_info& operator=( const user_info &s ) // assignment operator
{ user_name = s.user_name;
password = s.password;
user_id = s.user_id;
family_name = s.family_name;
user_type = s.user_type;
city_id = s.city_id;
area_id = s.area_id;
online = s.online;
return *this;
}
CString get_user_name();
CString get_password();
int get_user_id();
CString get_name();
CString get_family_name();
int get_user_type();
int get_city_id();
int get_area_id();
int get_statuse();
void test_list();
void Serialize (CArchive& ar);
private:
CString user_name;
CString password;
int user_id;
CString name;
CString family_name;
int user_type;
int city_id;
int area_id;
int online;
};
This is the implication of the Serialize method in the user_indo.cpp file:
IMPLEMENT_SERIAL(user_info, CObject, 0)
void user_info::Serialize(CArchive& ar)
{
CObject::Serialize (ar);
if (ar.IsStoring())
ar << user_name << password << user_id << name << family_name << user_type << city_id << area_id << online;
else
ar >> user_name >> password >> user_id >> name >> family_name >> user_type >> city_id >> area_id >> online;
}
This is the implication of the constructor of user_list:
user_list::user_list()
{
char* FileName="user_list.dat";
user_list::numOfUsers =0;
if (users_file.Open (FileName, CFile::modeRead))
{
CArchive ar (&users_file, CArchive::load); // construct
users.Serialize (ar);
ar.Close(); // destruct
users_file.Close();
}
}
This is the method that save the information to the disk:
void user_list::saveUsers()
{
char* FileName="user_list.dat";
user_info* user;
if (users_file.Open (FileName,
CFile::modeCreate | CFile::modeWrite))
{
CArchive ar (&users_file, CArchive::store); // constr
users.Serialize (ar);
ar.Close();
users_file.Close();
}
pos = users.GetHeadPosition();
do
{
if (pos == NULL) break;
user = (user_info*)users.GetNext(pos);
delete user;
} while (true);
users.RemoveAll();
}
The program crash at this method at the line ' users.Serialize (ar);'.
Can any one tell me what could be the problem?
Thanks in advance,
Chen
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Hi All:
This is a newb question for OpenGl but I don't see an OpenGl section so I did what was closest. I have OpenGl ES that I am going to be running on a PocketPc. I'm writing it in C++ and I am sure it has a lot of similarites to the normal OpenGl. Does anyone know how to import models (i.e people, cars, etc.) into an OpenGl environment? Also, how does one do large terrains in an openGl environment?
Sincere regards,
Did I post well? Rate it! Did I post badly? Rate that too!
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Hello all,
i've a problem to calling this SIMD(in c++) instruction from the VB6,i've upgrade my visual studio from to SP5.when i'll try to calling this function from vb, the application is shutdown and when i debug this message appear :
" unhandled exception in VB6.EXE(f.dll): 0XC0000005 : Access Violation".
is it the way i call the dll is wrong or i must use another method to calling this function from vb. thanks.
void _stdcall ssetest(float *arr1,float *arr2,float *result,int size)
{
int i;
int loop;
loop=size/4; //long number= 32bit
__m128* Rslt = (__m128*) result;
__m128* a1= (__m128*) arr1;
__m128* a2= (__m128*) arr2;
for(i=0;i
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Hello,
How can I convert const char* to LPCTSTR?
I tried to use WideCharToMultiByte so that I could have a LPCWSTR then convert to LPCTSTR but
the value of LPCWSTR(pdbfilename) on watch during breakpoint at line 9 is "???". (see code below)
1 HANDLE
2 fCreate(const char *fname, UInt32 access, UInt32 shared, UInt32 create, UInt32 attrib, Err *r_)
3 {
4 Err r = errNone;
5 HANDLE handle = NULL;
6 LPSTR holder=(LPSTR)fname;
7 LPCWSTR pdbfilename;
8 WideCharToMultiByte(CP_OEMCP, WC_DEFAULTCHAR,pdbfilename, -1,holder,strlen(fname),NULL, NULL);
9 handle = CreateFile(pdbfilename, access, shared, NULL, create, attrib, NULL);
10 if(handle == INVALID_HANDLE_VALUE)
r = ERR_FILE_CREATEOPENFAILED;
11 if(r_ != NULL)
12 *r_ = r;
13 return handle;
14 }
Is there something wrong with my WideCharToMultiByte API call?
Is there other way to convert const char* to LPCTSTR?
Thanks and more power.
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I thought LPCTSTR WAS a char * ? Anyhow, the easiest way to convert is to use the _bstr_t class, which is a string class that returns wide and narrow strings automagically.
Christian Graus - Microsoft MVP - C++
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Hi Christian,
Actually, the function belongs to a library and so the library is restricted to plain C so that it will be portable because I'am developing under Pocket PC environment.
Let me rephrase the question, on EVC4 LPCTSTR is unsigned short*, my first parameter (fname) is const char*, so how can i convert const char* to unsigned short*?
Thanks a lot Christian,
Fjlv2005
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OK, if you want to do it in C, _bstr_t won't help, it's a class. However, it just calls the API function that you're trying to call now, anyhow. You could check it's source to see if it differs from your syntax.
Christian Graus - Microsoft MVP - C++
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Ok I'll just check the API.
Thanks and Have a nice day.
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Have a look at the macros like A2CT, use MSDN "String Conversion Macros".
That was VC6, with VC7 their name has changed a bit (to A2CTEX or something).
----------------------
~hamster1
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Hi everybody,
Since I have no experience in C++ I request your help. I created a C# app that will be installed from a CD-ROM; I used the .NET bootstrapper plug in to install the framework if it hasn't been installed yet.
I need to provide an autorun for the CD-ROM; but... the CD will not only be used for the installation of the program, but also for the normal use of the program. So I need the autorun to check whether the application has been installed, if not than run setup.exe; if yes, don't do any autorun.
Can somebody point me to some freeware program that does this for me, or to some other good resources (keeping in mind that I don't really know C++).
Thanks a lot.
Gidon
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You can add to cd a file autorun.inf
file looks like:
[autorun]
open=edgeofchaos.exe
icon=edgeofchaos.exe,0
You can change, and you can try to write your ouwn program, to check if it is installed, if not then run setup.exe
or just use this autorun maker
http://www.indigorose.com/ams/index.php[^]
ps: Managed c++ has a little difrance than C#, if you program MC++ you can easly turn to C#
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