C / C++ / MFC Discussion Boards

Re: Let me rephrase my question

risingtechie1-Dec-06 5:50

risingtechie

1-Dec-06 5:50

Thanks too you also Chris. Very thorough.

Re: Sockets Programming Question

Roger Stoltz1-Dec-06 2:42

Roger Stoltz

1-Dec-06 2:42

This use of the struct keyword is a relic from C where it is a part of the type name.
In C++ it's perfectly legal to omit the struct keyword.

E.g. for C

struct MyStruct
{
    int nFirst;
    int nSecond;
};

int main( int argc, char* argv[] )
{
    struct MyStruct theStruct; /* Quite allright! */
    MyStruct theStructCopy;    /* Unknown type! */
}

and for C++

struct MyStruct
{
    int nFirst;
    int nSecond;
};

int main( int argc, char* argv[] )
{
    struct MyStruct theStruct; /* Quite allright since it's compatible backwards */
    MyStruct theStructCopy;    /* Also allowed  */
}

--
Roger

"It's supposed to be hard, otherwise anybody could do it!" - selfquote

"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

Re: Sockets Programming Question

risingtechie1-Dec-06 2:48

risingtechie

1-Dec-06 2:48

Makes perfect sense now. Thank you Roger.

How to create icons from a font?

Manfred Staiger1-Dec-06 1:20

Manfred Staiger

1-Dec-06 1:20

The icons on the windows system menu are made from the true type font Marlett. Does anybody know how I can use these icons? Are they created from the font at runtime (how?), or are they allocated as icons in a ressource (which?).

Re: How to create icons from a font?

peterchen1-Dec-06 3:53

peterchen

1-Dec-06 3:53

Neither-Nor

see MSDN: DrawFrameControl, if should be the DFCS_CAPTIONCLOSE, DFCS_CAPTIONMAX etc. uState values

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Re: How to create icons from a font?

Manfred Staiger1-Dec-06 4:03

Manfred Staiger

1-Dec-06 4:03

Thanks, thats seems to be the solution.

Is wchar_t only for unicode?

Atul231-Dec-06 1:18

Atul23

1-Dec-06 1:18

Hi
I want application to convert unicode enabled. so for this i am converting all datatype to wide characters.if i used only widecharacter datatypes then Is they applicable for both unicode and ASCII.

Re: Is wchar_t only for unicode?

Christian Graus1-Dec-06 1:26

Christian Graus

1-Dec-06 1:26

I suspect you want TCHAR.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Is wchar_t only for unicode?

James R. Twine1-Dec-06 4:03

James R. Twine

1-Dec-06 4:03

   The wchar_t type can be used by both ANSI and Unicode applications, just like int and double can be.

   But what exactly do you mean by "Unicode enabled"? Do you mean that you want the application to support Unicode text, but still run on ANSI-only systems like Win 9x/me, or you want to write a native Unicode application, that only uses the Unicode APIs, and not the ANSI ones?

   Any application, regardless of an ANSI or a Unicode build, can manipulate both Unicode and ANSI data, and can even make calls to both versions of API functions. For example:

MessageBoxA( NULL, "ANSI", "MessageBox", MB_OK );
<code>MessageBoxW( NULL, L"Unicode", L"MessageBox", MB_OK );</code>

   When developers talk about a Unicode application, they generally mean a Unicode build of the application, which means that it is linked against the Unicode Windows API libraries, and will not run an an ANSI-only system.

   There is no such thing as a TCHAR application. There is TCHAR-based code can be used to create both both ANSI and Unicode builds. TCHAR and TCHAR-based identifiers/names like _tcscpy(...) get converted to the character type for the build being done.

   For example, for an ANSI build, TCHAR becomes char, _tcscpy(...) becomes strcpy(...) and MessageBox(...) becomes MessageBoxA(...).

   For a Unicode build, TCHAR becomes wchar_t, _tcscpy(...) becomes wcscpy(...) and MessageBox(...) becomes MessageBoxW(...).

   Peace!

-=- James

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Problem in returning value from the dll exported function

DattaK1-Dec-06 1:12

DattaK

1-Dec-06 1:12

Hi all,

I have a C function in my dll workspace. This function is exported from the dll. I want to return value from the function. The value is of enum type. The declaration and the defination of this enum type variable is in some different .h file. so how should i export this function and get the return value.

I have exported the function by using the following statement.

__declspec(dllexport) rs_result rdiff_sig(const char *BasisPath, const char *SigPath);

i am getting error messages and they are :

error C2146: syntax error : missing ';' before identifier 'rdiff_sig'
error C2501: 'rs_result' : missing storage-class or type specifiers
fatal error C1004: unexpected end of file found

How should i solve this issue.

Please help me.

Thanks

Datta

Re: Problem in returning value from the dll exported function

Cedric Moonen1-Dec-06 1:56

Cedric Moonen

1-Dec-06 1:56

If you return an enum, the program using the dll needs to know what it is, so you need to include the header file containing the declaration of the enum in your program also.

Cédric Moonen
Software developer

Charting control [v1.1]

Re: Problem in returning value from the dll exported function

DattaK1-Dec-06 2:10

DattaK

1-Dec-06 2:10

Yes i included the .h file and it worked.

Thanks

Problem in exporting a dll function

DattaK1-Dec-06 1:11

DattaK

1-Dec-06 1:11

Hi all,

I have a win32 dll workspace. In this workspace i have most of the files as .c files. I want to export one of the function from this dll. The function is a static function. so for that function if i export it in this way

__declspec(dllexport) static rdiff_sig(const char *BasisPath, const char *SigPath);

i am getting one error message as below.

error C2201: 'rdiff_sig' : must have external linkage in order to be exported/imported

What should i do to solve this problem.

Thanks

Datta K.

Re: Problem in exporting a dll function

Cedric Moonen1-Dec-06 2:00

Cedric Moonen

1-Dec-06 2:00

I'm not an expert in C programming but I think that declaring a global function as static means that it is only accessible from within that file. Did you try what your compiler told you ? That is specify the function as extern (put the keyword extern in front of it) ?

Cédric Moonen
Software developer

Charting control [v1.1]

caption buttons

radhika281-Dec-06 0:12

radhika28

1-Dec-06 0:12

I want the caption bar buttons(i.e,mim,max,and close) to be removed completely.Is it possible.

Re: caption buttons

toxcct1-Dec-06 0:14

toxcct

1-Dec-06 0:14

remove them from the system menu of your application...

You don't know where to start ? ask a good friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: caption buttons

radhika281-Dec-06 0:26

radhika28

1-Dec-06 0:26

Thanks.I have another question can we replace these by bitmap buttons with same features.Because i have added gradient color to the title bar and now look of these buttons is not good on the title bar.so only i want to remove these buttons.And i want to add bitmap buttons in their place.Is my approach good or can we modify look of existing buttons on the title bar.

Re: caption buttons

David Crow1-Dec-06 3:20

David Crow

1-Dec-06 3:20

See if either of these two articles help:

http://support.microsoft.com/kb/q99046/[^]

http://www.codeproject.com/dialog/gradienttitlebar.asp?df=100&forumid=1240&exp=0&select=1064919[^]

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Exe's GUI not visible in Remote Access

nsurendran30-Nov-06 23:34

nsurendran

30-Nov-06 23:34

Hi,
From a CPP program, I am creating a service. And from that service I am invoking an exe with CreateProcess function. The problem here is that, when that service is started locally then the exe's GUI is visble. But if the service is started from the machine thru remotedesktop connection, the exe's GUI is not visible. But I can see the exe process in task manager.

Please help me in this regards.

Thanks in advance.

Surendran

Re: Exe's GUI not visible in Remote Access

Galatei1-Dec-06 0:37

Galatei

1-Dec-06 0:37

Hi,

If it is a service, then it is executed in local session, which is different from the one that you're operating.
You have to attach your service desktop to the one you're going to display GUI on. AFAIK, there's no way to attach your GUI to something like "global" desktop so it would be visible for all. Only one desktop can be attached at once.

I suggest, creating GUI as client app and use IPC to speak with your service. This way, your GUI may have access to the service from multiple desktops at once. use sockets, shared memory or pipes for IPC (shmem or pipe should be created in global namespace).

Regards

problem invoking method of active-x control

pv_pravin30-Nov-06 23:11

pv_pravin

30-Nov-06 23:11

sir,
I want to invoke active-x control method.
The object for which is getting created on use of methods(CoGetClassObject , RequestLicKey ,CreateInstanceLic), but i couldn't able to invoke methods of Active-x control.
Here is the code which explains the problem. please suggest me for further action.

void CContainerView::OnRButtonDown(UINT nFlags, CPoint point)
{
IClassFactory* pclsf;
IClassFactory2* pclsf2;
IUnknown* pUnk;
ICalendar* pmydll;

BSTR lickey;

//for mmcontour clsid
static CLSID const clsid = { 0x621464c0, 0x5e90, 0x4da2, { 0x9a, 0x6b, 0x9b, 0x7f, 0xdd, 0x31, 0x91, 0x98 } };

//get the IClassFactory Interface pointer
IDispatch *pDisp = NULL;
HRESULT hr = CoGetClassObject(clsid,CLSCTX_INPROC_SERVER,NULL,
IID_IClassFactory,(void**)&pclsf);

hr = pclsf->QueryInterface(IID_IClassFactory2, (void**)& pclsf2);

if (FAILED(hr))
pclsf->Release();

IMmContrs *pObj;

//To get License key
hr = pclsf2->RequestLicKey(20,&lickey);

//To create instance of object using License key
HRESULT hr2 = pclsf2->CreateInstanceLic(NULL,NULL, IID_IOleObject ,
lickey, (void **)&pObj);

TRY
{
BOOL blTitle;
//Getting Following Error on Execution of methods in MMContour :
//Unhandled exception at 0x78303ba4 (mfc80d.dll) in Container.exe: //0xC0000005: Access violation reading location 0x00000000.
blTitle=pObj->AboutBox();
}
CATCH_ALL(e)
{
THROW_LAST();
}
END_CATCH_ALL
//finally
//{
pclsf2->Release();
}

waiting for your reply.

regards,
praveen A.
praveena@navayuga.co.in

praveen kumar agarwal.

Re: problem invoking method of active-x control

Galatei1-Dec-06 0:33

Galatei

1-Dec-06 0:33

Hi,

It seems that pObj is not created.
Are you certain that this ActiveX control does contain runtime license key? You should check for its availability with GetLicInfo. One of the members of LICINFO structure, fRuntimeKeyAvail, does specify if such license can be obtained, by using RequestLicKey. If there's no runtime license, you have to provide license key, manually.

Also, check hr2 for errors, when creating instance.

Regards

Re: problem invoking method of active-x control

pv_pravin1-Dec-06 18:16

pv_pravin

1-Dec-06 18:16

I am able to get license key. the active-x control is getting instantiated. But problem is with invoking method/properties of the control. I get access violation error.

regarding hr2, it is returning S_OK.

Thanks & Regards,
Praveen A.

using an ADT object [modified]

Spherelin30-Nov-06 22:54

Spherelin

30-Nov-06 22:54

I am working on a C++ class project in MSVC. I have declared:

class Node
{
private:
.
.
.

public
.
.
.
};

now in a separate file, I want to declare:

class Employee
{
private:
Node alphabetagamma; // for example
.
.

public:
.
.
.

};

When I do this I get compile time errors indicating that the compiler does not recognize "Node" as a type of object. I am including the header files correctly in my implementation (.cpp) files. What am I forgetting?

Thanks,
Geoff Cry | :((

-- modified at 5:02 Friday 1st December, 2006

Re: using an ADT object

Cedric Moonen30-Nov-06 23:12

Cedric Moonen

30-Nov-06 23:12

Spherelin wrote:
I am including the header files correctly in my implementation (.cpp) files

If you declare an instance of Node in your header file, then you need of course to include the header file of Node in thie file also (otherwise, the class Node is not recognized).

Cédric Moonen
Software developer

Charting control [v1.1]

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