Re: Inner or nested classes - C / C++ / MFC Discussion Boards

Re: Microsoft Visual C ++ for Windows64-bit (no PreRelease)

Mike Dimmick23-Jan-04 0:47

23-Jan-04 0:47

I don't think there's even a pre-release. For the moment, you need to use the compiler from the Driver Development Kit[^].

Re: Microsoft Visual C ++ for Windows64-bit (no PreRelease)

hvladimir23-Jan-04 2:34

hvladimir

23-Jan-04 2:34

You are mistaken. Pre-release exists.

PKZIP error

JensB22-Jan-04 23:38

JensB

22-Jan-04 23:38

Hi
I have a problem with PKZIP using MFC.
I run the PKZIP program but it gives me an error:
PKZIP: <e7> Can't create: PKBACK# 001

I have looked into 'E7' ... not enough permittions put i have all permittions to write in the needed folder.

Any ideas?
Jens

Re: PKZIP error

Steve S23-Jan-04 0:23

Steve S

23-Jan-04 0:23

Are you using spanning?
Normally PKZIP labels the media it uses as it progresses.

Steve S

Re: PKZIP error

JensB23-Jan-04 1:25

JensB

23-Jan-04 1:25

yes i use -span indeed

can i send you a print screen of the error to your email address if your willing to give it to me ?

Greetings
Jens

Re: PKZIP error

Steve S23-Jan-04 6:40

Steve S

23-Jan-04 6:40

No point. The error message is concise and accurate, and unless it displays an error code wouldn't give me any more information.

How are you exec-ing PKZIP from within your app?
(Source more useful than a screen dump;))

Steve S

Inner or nested classes

conrad Braam22-Jan-04 23:20

conrad Braam

22-Jan-04 23:20

GURU's only! Eek! | :eek:

I have a class "hidden" inside my main class, a kind of inner class if U like.

class a : public CObject<br />
{<br />
   DECLARE_DYNCREATE(a)<br />
public:<br />
   a();<br />
<br />
   class b : public CObject<br />
   {<br />
      DECLARE_DYNCREATE(b)<br />
   public:<br />
      b();<br />
   };<br />
};<br />

But the IMPLEMENT_DYNAMIC macro expansion baffles the compiller's brain

<br />
IMPLEMENT_DYNCREATE(a, CObject)<br />
IMPLEMENT_DYNCREATE(b, CObject)<br />

with the following messages:
error C2653: 'b' : is not a class or namespace name
error C2061: syntax error : identifier 'b'

I have tried everything but write my own body for CreateObject() so I can get runtime class info, doing

IMPLEMENT_DYNCREATE(a::b, CObject)<br />

Seems logical, but does not hel, since a is nit a namespace or so the compiller says. Frown | :(

Conrad - conradb@adroit.co.za
Always do badly to start off, that way when you get the hang of it suddenly, everyone is surprised.

Re: Inner or nested classes

conrad Braam18-Feb-04 22:57

conrad Braam

18-Feb-04 22:57

I have since tried.....

<br />
typedef a::b NestedBase;<br />
<br />
IMPLEMENT_DYNCREATE(a, CObject)<br />
<br />
//from #define RUNTIME_CLASS(class_name) ((CRuntimeClass*)(&class_name::class##class_name))<br />
#define MYRUNTIME_CLASS(class_name) ((CRuntimeClass*)&a::b::b())<br />
<br />
// from _IMPLEMENT_RUNTIMECLASS<br />
#ifdef _AFXDLL<br />
<br />
   #define MY_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew) \<br />
	   CRuntimeClass* PASCAL class_name::_GetBaseClass() \<br />
		   { return RUNTIME_CLASS(base_class_name); } \<br />
         CRuntimeClass* class_name::GetRuntimeClass() const \<br />
         { return MYRUNTIME_CLASS(class_name); } <br />
//   	AFX_COMDAT AFX_DATADEF CRuntimeClass class_name::class##class_name = { \<br />
//   		#class_name, sizeof(class class_name), wSchema, pfnNew, \<br />
//   			&class_name::_GetBaseClass, NULL }; <br />
<br />
#else<br />
   #define MY_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, pfnNew) \<br />
	   CRuntimeClass* PASCAL class_name::_GetBaseClass() \<br />
		   { return RUNTIME_CLASS(base_class_name); } \<br />
         CRuntimeClass* class_name::GetRuntimeClass() const \<br />
         { return MYRUNTIME_CLASS(class_name); } <br />
<br />
#endif<br />
<br />
<br />
// from IMPLEMENT_DYNCREATE, just calls MY_IMPLEMENT_RUNTIMECLASS instead<br />
#define MYIMPLEMENT_DYNCREATE(class_name, base_class_name) \<br />
	CObject* PASCAL class_name::CreateObject() \<br />
		{ return new class_name; } \<br />
	MY_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 0xFFFF, \<br />
		class_name::CreateObject)<br />
<br />
<br />
<br />
MYIMPLEMENT_DYNCREATE(NestedBase, CObject)   <br />

...
but to no avail, since I cannot get the last bit of my MY_IMPLEMENT_RUNTIMECLASS macro to work (commented out)

hELP hELP HeLP HElp.

Conrad - conradb@adroit.co.za
Always do badly to start off, that way when you get the hang of it suddenly, everyone is surprised.

List Control header changed WM

nurpinar22-Jan-04 22:22

nurpinar

22-Jan-04 22:22

I have a list control with LVS_EX_HEADERDRAGDROP property.
Which Window Message or Control Notification Message is related when there is a change detected in HEADER order? OnColumnClick doesnt handle.
Thanks in advance

how to write a CString object into a file?

P_JAYAPRAKASH22-Jan-04 21:18

P_JAYAPRAKASH

22-Jan-04 21:18

Hai
i would like to know how to write a CString object into file;
Please help me!!

Thanks

JP

Re: how to write a CString object into a file?

alex.barylski22-Jan-04 22:13

alex.barylski

22-Jan-04 22:13

You can use MFC serialization or you can do it directly using MFCC File object

CFile myFile('test.dat', CFile::modeWrite);

CString buff;
buff = "This is some text";

myFile.Write(buff, buff.GetLength());

p.s- you can also use Windows SDK functions or the CRT functions so your code works on all platforms (most anyways)

HTH

Cheers Smile | :)

The word of the day is legs, let's go back to my house and spread the word Poke tongue | ;-P

Re: how to write a CString object into a file?

P_JAYAPRAKASH22-Jan-04 23:10

P_JAYAPRAKASH

22-Jan-04 23:10

hi
Thanks for ur reply.Did u check this code,since it is not working.

Thanks
JP

Re: how to write a CString object into a file?

alex.barylski22-Jan-04 23:19

alex.barylski

22-Jan-04 23:19

Typically code I write here on CP is psuedo code, just to get you started on the right direction, I hardly never test code.

try this instead:

CFile myFile('test.dat', CFile::modeWrite);
CString buff;
buff = "This is some text";
myFile.Write(buff.GetBuffer(buff.GetLength()), buff.GetLength());

The word of the day is legs, let's go back to my house and spread the word Poke tongue | ;-P

Re: how to write a CString object into a file?

Abhishek Srivastava22-Jan-04 23:28

Abhishek Srivastava

22-Jan-04 23:28

Try to write like this!

CFile myFile('test.dat', CFile::modeWrite);<br />
CString buff;<br />
buff = "This is some text";<br />
myFile.Write(str.operator LPCTSTR(),buff.GetLength());

Abhishek Srivastava
Software Engineer (VC++)
India ,Noida
Mobile no 9891492921 Smile | :)

Re: how to write a CString object into a file?

P_JAYAPRAKASH23-Jan-04 3:05

P_JAYAPRAKASH

23-Jan-04 3:05

hi
Thanks for ur solution!!

But if u use above code..it is not giving any error while executing..but this writes our data with some junk value...So we can't retrieve it properly.

Cheers
JP Smile | :)

Transparency of an object.

swarnamanoo22-Jan-04 20:52

swarnamanoo

22-Jan-04 20:52

I developed a drawing application which draws colored rectangles,circles etc...when i place one object on other i need to see the beneath object and must change the transparency level from full transparent to opaque with the same color of the object...how can i do it...?

Re: Transparency of an object.

alex.barylski22-Jan-04 22:16

alex.barylski

22-Jan-04 22:16

AlphaBlend() API or you will have to write you own or find pre-written code to do it for you.

There is probably something available here on CP under bitmap section if you look hard.

Cheers Smile | :)

The word of the day is legs, let's go back to my house and spread the word Poke tongue | ;-P

OnQueryDragIcon

monrobot1322-Jan-04 20:46

monrobot13

22-Jan-04 20:46

I see this function in almost all wizard generated code and (maybe I'm a fool for asking), but what does this function do? I see the comments that say "The system calls this function to obtain the cursor to display while the user drags the minimized window". I've been using Windows for a while, but I've yet to be able to "drag" a minimized window. I'm thinking that a "minimized window" is one that's been minimized to the taskbar, and if that's correct how do you drag it?

Thanks.

- monrobot13

Re: OnQueryDragIcon

Mike Dimmick23-Jan-04 0:39

Mike Dimmick

23-Jan-04 0:39

Left-overs from Windows 3.x. Basically irrelevant now, I believe.

Re: OnQueryDragIcon

Michael Dunn23-Jan-04 4:44

Michael Dunn

23-Jan-04 4:44

Before Win 95, there was no Taskbar. Minimized apps became icons at the bottom of the screen, and you could move them around if you felt like it. WM_QUERYDRAGICON was sent when you started to drag an icon.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
"Linux is good. It can do no wrong. It is open source so must be right. It has penguins. I want to eat your brain."
-- Paul Watson, Linux Zombie

Re: OnQueryDragIcon

monrobot1323-Jan-04 7:50

monrobot13

23-Jan-04 7:50

Ah, that would explain it. Would it be safe to remove the function then if I know for a fact that application wont be run on anything below Windows 95?

Thanks.

- monrobot13

Re: OnQueryDragIcon

Michael Dunn23-Jan-04 13:04

Michael Dunn

23-Jan-04 13:04

Yes, terminate it Wink | ;)

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
You cannot stop me with paramecium alone!

Re: OnQueryDragIcon

monrobot1323-Jan-04 20:26

monrobot13

23-Jan-04 20:26

Awesome. Thanks for the help Mike.

- monrobot13

Design question (Model-View

Jerome Conus22-Jan-04 20:36

Jerome Conus

22-Jan-04 20:36

Hi !

I've a class CModel containing a list a CPlane objects. The CPlane class has a method called changeOrigin(). The third class CModelViewer is a class displaying the CModel object as a treelist : the CModel object is displayed and the user can expand the CModel and see the list of CPlane contained in the CModel. When the user right-click on a CPlane, he/she can change the origin of the CPlane.

My question is, according to good design rules, how am I supposed to change the origin of the selected CPlane ? Should I change it in the CModelViewer, directly calling the changeOrigin() method of CPlane (but with this way, CModel won't know than one of its CPlane has changed), or should I implement a changePlaneOrigin() in the CModel class, call it from CModelViewer and let CModel change the origin of it's underlying CPlane ? (but with this way, each time I add a method in the CPlane class which would change the state of the CPlane object, I would have to add it in the CModel as well).

I hope I made myself clear enough and I'm looking forward to reading your suggestions !

Thanks !
Jerome

PS: Here is how the class would look :

class CModel
{
public:
CModel();
~CModel();

CPlane[10] m_PlaneList;
};

class CPlane
{
public:
CPlane();
~CPlane();

void setOrigin(Position NewOrigin);
private:
Position m_Origin;
};

Re: Design question (Model-View

CodeBrain23-Jan-04 1:29

CodeBrain

23-Jan-04 1:29

If CModelViewer is a view for the CModel class it would be a good idea to do call a change method of CModel. In general it's not a good idea to make the CPlane array public in the CModel class.

An other solution may be that CPlane has also a view, e.g. CPlaneView. This view (and controller) would be a knot (item) in you CModelViewTree. Of course with this simple implementation CModel won't be informed if one of its CPlane objects changed. You may want to use the observer design pattern to inform CModel that a CPlane object has been changed.

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