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I included the header file of the template class in the header of the class that use it, adding it to the cpp file doesn't help
(i get the same error messages). Details: I wrote a template class that represent a list of objects. this it's definition:
<code>template< class T >
class obj_list
{
public:
obj_list();
virtual ~obj_list();
void addObject(T *object);
T getObjectAt(int i);
void saveObjects();
int getNumOfObjects();
void close_file();
void setFilename(char *fileName);
private:
char* file_name;
CObList objects;
POSITION pos;
CFile objects_file;
int numOfObjects;
};</code> It's implication came in the same header file (i heard that when i writing a template class I need to put the definition and
implication in the header file). I have a class named info_dlg, and in it's header file I create a variable of the type of
obj_list, by writing this line:
obj_list<user_info> user_s();
(user_info is a class that hold information about a user). In the cpp of info_dlg, I have some methods that in them I try
to use some of obj_list's methods, but i get error messages like that:
C:\My Documents\tel_op3\tel_op3\info_dlg.cpp(14) : error C2228: left of '.setFilename' must have class/struct/union type
C:\My Documents\tel_op3\tel_op3\info_dlg.cpp(21) : error C2228: left of '.saveObjects' must have class/struct/union type
C:\My Documents\tel_op3\tel_op3\info_dlg.cpp(41) : error C2228: left of '.addObject' must have class/struct/union type
I hope this is enough details, and you could help me.
Chen
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Hi, Does any one know of a tool that can be used to extract/copy public members of a class(and possibly certain specified protected/prvte members) into a new class declaration(with same class name) in a new header file, given a header file with declaration of the existing class.
For example:
Given .h file with a class declaration below:
---file classA.h----
classA{
public:
void a1();
void a2(int n);
protected:
void a3();
int m_n;
};
---file classA.h----
Want a new .h file with the following class declaration:
---file classA_r.h----
classA{
public:
void a1();
void a2(int n);
};
---file classA_r.h----
We need such a tool so that when we provide the header files of classes in our library to the clients, we want to hide any protected/prvt members and show only the public members they need. We can do this by hand but if there is a tool it will be greatly helpful to create large number of new modified header files from existing ones. Preferably the tool should work with/in VisualStudio.NET 2003 IDE and preferably free.
Thanks
-- modified at 11:02 Thursday 1st September, 2005
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Grettings all,
Another GDI+ question...
GDIPen is used to draw path. Lets say I have 2 paths on canvas and i would like to cmbine them.
I create regions from paths, then combine regions. The result is displayed with a filled region. I originally used GDIPen, but th result is filled now ( which is not something I would like to happen). Can someone advise if there is a better way to get the result I need?
Thanks in advance
Sincerely,
Max Pastchenko
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Hi,
I got some unexpected trouble when I tried to write a managed wrapper around a native dll.
This is what I did:
1) wrote a wrapper in C++/CLI and compiled it into dll file (with /clr switch)
2) created project in C# and added reference to a wrapper
3) in C# I created instances of some classes from my wrapper, everything compiled fine
4) when I ran C# project I got FileLoadException saying: A procedure imported by [assembly name] could not be loaded.
Any ideas what might cause FileLoadException?
This is a simplified C++/CLI code which I used for testing and got the same problem as described above:
<br />
<br />
#pragma once<br />
<br />
#include <irrlicht.h><br />
#pragma comment(lib, "Irrlicht.lib")<br />
<br />
<br />
using namespace System;<br />
using namespace irr;
<br />
<br />
namespace test<br />
{<br />
public ref class Class1<br />
{<br />
public:<br />
<br />
void Foo(void)<br />
{<br />
System::Console::WriteLine("blah blah blah");<br />
}<br />
<br />
void Bar()<br />
{<br />
IrrlichtDevice * dev = createDevice(); <br />
}<br />
<br />
};<br />
}<br />
--
moose
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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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