C / C++ / MFC

11-Jul-12 3:07

Don't use more than 8 characters for the name and 3 for the extension.

Re: how to get a short file name before file creation?

pasztorpisti11-Jul-12 10:37

pasztorpisti

11-Jul-12 10:37

Great wisdom speaks, I didn't see the tree from the forest. Big Grin | :-D

Re: how to get a short file name before file creation?

Richard MacCutchan11-Jul-12 22:54

11-Jul-12 22:54

pasztorpisti wrote:
Great wisdom speaks

Not really, I was being facetious.

Re: how to get a short file name before file creation?

David Crow11-Jul-12 3:13

David Crow

11-Jul-12 3:13

Le@rner wrote:

i want to get short file name or short path name before file creation please help me how can i do this?

Are you looking for GetTempFileName()?

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Re: how to get a short file name before file creation?

jschell11-Jul-12 8:37

jschell

11-Jul-12 8:37

DavidCrow wrote:
Are you looking for GetTempFileName()?

How would one use that to produce a file name based on a long file name? That is what the OP is asking.

Re: how to get a short file name before file creation?

David Crow11-Jul-12 9:50

David Crow

11-Jul-12 9:50

jschell wrote:

How would one use that to produce a file name based on a long file name? That is what the OP is asking.

Since he is already using GetShortPathName() to produce a short file name based on a long file name, I'm not real sure what he is asking.

Re: how to get a short file name before file creation?

jschell12-Jul-12 10:19

jschell

12-Jul-12 10:19

DavidCrow wrote:
Since he is already using GetShortPathName() to produce a
short file name based on a long file name,

No that isn't what the OP says.

Re: how to get a short file name before file creation?

Le@rner31-Jul-12 1:28

Le@rner

31-Jul-12 1:28

thanks

Pure virtual methods

Rocky65110-Jul-12 23:12

Rocky651

10-Jul-12 23:12

Hello,
I develop add-ons for MS Flight Simulator and I use the poorly documented SDK for this. The SDK provides a .h file in which an interface class is defined (with pure virtual methods only), something like this:

C++

class IPanelCCallback {
public:
	virtual IPanelCCallback* QueryInterface (PCSTRINGZ pszInterface) = 0;
	virtual bool  ConvertStringToProperty (PCSTRINGZ keyword, SINT32* pID) = 0;
	virtual bool  ConvertPropertyToString (SINT32 id, PPCSTRINGZ pKeyword) = 0;
};

In my code, I use this interface like this:

C++

IPanelCCallback* pCallBack = panel_get_registered_c_callback("fs9gps");
...
SINT32 id;
pCallBack->ConvertStringToProperty(propertyName, &id);

Everything works fine, but I don't understand why... I thought the linker would stop with an "undefined symbol" error because the IPanelCCallback methods, such as ConvertStringToProperty, are declared as pure virtual but defined nowhere, and I don't use any library for linking. With such an interface class, I thought I would have to defined a subclass of IPanelCCallback and define the ConvertStringToProperty method. My code works, so I shouldn't complain, but I would like to know more about the use of interface classes, this is a subject I don't know much.

Any information is greatly welcome !!

Thank you,
Eric

Re: Pure virtual methods

pasztorpisti11-Jul-12 0:27

pasztorpisti

11-Jul-12 0:27

The essence of virtual functions/methods is that you don't know and don't have to know what is the actual implementation of the given function. This can be used to design code that uses polymorphism (object oriented programming), or to hide actual implementation from the user (this is probably what happens in your case).

The interface is implemented by the flight simulator. They have a class that implements that interface and that class is already compiled to the flight simulator. You dont need the source of that implementation either. That interface is just an instruction to your compiler, it tells your compiler how to call the already compiled implementation (binary) inside the flight simulator. Maybe you should look up some tutorials on how virtual functions work in c++ (vtables), its useful to know how things work in detail.

Re: Pure virtual methods

jschell11-Jul-12 8:40

jschell

11-Jul-12 8:40

Simplifying the previous answer a bit.

You think that pCallBack is a IPanelCCallback.

It isn't. It is some other class.

That class is derived from IPanelCCallback so your code works.

STL Containers store a copy?

piul9-Jul-12 22:49

piul

9-Jul-12 22:49

Hello!
My question is, do STL containers store a copy or they keep the object itself? Hence, can I insert a local variable into a container?

C++

typedef struct{
  int number;
  string name; } myData;
class myClass{
  void InsertData(myData &a);
  void oneFunction ();
  void otherFunction ();
  collection <myData> m_memberCollection;
};
void oneFunction() {
  myData localData;
  localData.name = "Paul";
  InsertData(localData);
}
void myClass::InsertData (myData &a){
  a.number = 5;
  m_memberCollection.push_back(a);
}
void otherFunction (){
  printf ("%s %d", m_memberCollection[0].name.c_str(), m_memberCollection[0].number);
}

Or do I need to use a collection of the type collection<*myData>?

Richard MacCutchan9-Jul-12 23:07

9-Jul-12 23:07

piul wrote:
Or do I need to use a collection of the type collection<*myData>?

That would be a collection of pointers, which would probably lead to memory leaks and/or loss of information. Your original code takes copies of the objects and adds them to the collection, so the data is retained.

piul9-Jul-12 23:20

piul

9-Jul-12 23:20

thanks!

Aescleal10-Jul-12 7:11

Aescleal

10-Jul-12 7:11

Not particularly pertinent to the question but just a quick note... You don't need to write typedef structs in C++ the way you do in C to introduce a new type. Instead you can just write:

C++

struct myData
{
    // Members
};

and it'll do almost the same thing as your typedef (try adding some member functions to see what the difference is).

Stefan_Lang10-Jul-12 23:10

Stefan_Lang

10-Jul-12 23:10

I wonder how many people will catch that hint, so here goes:

The only difference is that the typedef'd struct is unnamed, so you cannot add a constructor or destructor! You could fix that by adding a name explicitely:

C++

typedef struct myData_struct {
 ...
} myData;

But of course then you wouldn't need the typedef at all since myData would be synonymous to myData_struct.

Richard MacCutchan11-Jul-12 3:05

11-Jul-12 3:05

Absolutely right, but for those of us with K&R hardwired into the brain it's a tough habit to kick.

Process

sarfaraznawaz9-Jul-12 21:25

sarfaraznawaz

9-Jul-12 21:25

hi
i am calling the video player exe in my application that will show preview for the user.
now the problems is that i want to disable the child window or window untill this exe run.after completion of preview the window should enable .

C++

Here is my code :
void CPreview::OnpreviewBtnClk()
{
	::MessageBox(m_hWnd,_T("here is the preview "),_T("INFORMATION"),MB_ICONINFORMATION);
	
	TCHAR szCmdline[MAX_PATH];
	CString szWindowTitle = _T("rs-mplayer");
	VERIFY(::GetModuleFileName(AfxGetApp()->m_hInstance, szCmdline, _MAX_PATH));			
	szCmdline [StrRChr (szCmdline, NULL, _T('\\')) - szCmdline] = _T('\0');
	_tcscat_s(szCmdline, _T("\\rs-mplayer.exe /"));

 	ShellExecute(NULL,_T("open"),szCmdline,NULL,sourceFileName,SW_SHOWNORMAL);
 	
//	ProcessID = GetProcessId(szWindowTitle);
 
 	Sleep(500);
 
 	CWnd *pOtherWnd = CWnd::FindWindow(NULL, szWindowTitle);
 	h_Rs_playerProcessId  =pOtherWnd;
 
 	if (pOtherWnd)
 	{
		//ProcessID = GetProcessId(pOtherWnd);
		
 		MYDATA      m_mydata;
 		wcscpy(m_mydata.m_pName,sourceFileName);
 		m_mydata.m_bNameLength = (BYTE)sourceFileName.GetLength();
 		m_mydata.m_ullNodeSize =   m_li64FileSize.QuadPart;
 
 		COPYDATASTRUCT cpd;
 		cpd.dwData = 1;
 		cpd.cbData = sizeof(MYDATA);
 		cpd.lpData = (void*)&m_mydata;
		//GetProcessTimes(h_Rs_playerProcessId,);
 
 		copyDataResult = pOtherWnd->SendMessage(WM_COPYDATA,
 			(WPARAM)AfxGetApp()->m_pMainWnd->GetSafeHwnd(),
 			(LPARAM)&cpd);
 
 	} 
 	ProcessID;
	
	
	// PreviewFile(szCmdline, sourceFileName, szWindowTitle,  m_li64FileSize.QuadPart);
	<pre><pre>

}

Please reply me soon
got struct from past two days
Best Regards
sarfaraz

Code-o-mat9-Jul-12 23:21

Code-o-mat

9-Jul-12 23:21

1. Instead of ShellExecute, use CreateProcess[^]. This will give you a handle to the process in the struct specified for lpProcessInformation.
2. Use EnableWindow[^] to disable whatever you wish to disable.
3. Run a timer with SetTimer[^], e.g. let it run every 5 seconds.
4. In the timer function, use WaitForSingleObject[^] with the handle of the process and a timeout of zero. When this gives you WAIT_OBJECT_0, it means that the process has exited. If it did not, do nothing special.
5. If the process DID exit (you got the event signalled in step 4), then kill the timer with KillTimer[^], use EnableWindow to re-enable what you need and don't forget to close the handles you got in that structure in step 1.

Wouldn't this work for you?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

sarfaraznawaz11-Jul-12 2:27

sarfaraznawaz

11-Jul-12 2:27

while(pOtherWnd!=0)
    {
        pOtherWnd = CWnd::FindWindow(NULL, szWindowTitle);
         //WaitForSingleObject(h_Rs_playerProcessId,INFINITE)
         CPreview::EnableWindow(FALSE);
        if(pOtherWnd == NULL)
        {
            CPreview::EnableWindow(TRUE);
       
            break;
        }
        sleepmode=5000;
        Sleep(sleepmode);
}<pre<pre> lang="c++"></

i got the pOtherWnd is handle
i set the timer sleepmode in sleep(sleepmode)
its working fine after some time the window will strat not responding ..

i have added the code with respect to the earlier code which i had posted .
i tried with waitsingleobject by getting the handle og main window even though its not working
help me out this
Best
Regards
sarfaraz

Code-o-mat11-Jul-12 3:12

Code-o-mat

11-Jul-12 3:12

Noone said you should use WaitForSingleObject with the window handle, of coure that doesn't work. And your aproach is wrong because while you are running this while loop -i assume you do this in the main GUI thread- your application is not processing any incoming messages, thus it will not respond.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<