C / C++ / MFC Discussion Boards

Re: Opening a USB keyboard when Windows already has it open? [modified]

plineaRenade27-Jan-07 10:10

27-Jan-07 10:10

I have about the same problem.
Did you find a solution yet?

Allso, I'm searching how you can capture the barcode-imput while you don't allow it to be send to the active application (normally, when you have e.g. word open, the barcode-number is send as trext to the screen). I want the barcode number to be available without it being send to Word...

How can I do that?

Thanks.

-- modified at 2:41 Sunday 28th January, 2007

Missing Virtual Functions in Properties/Overrides

bob1697213-Sep-06 7:52

bob16972

13-Sep-06 7:52

Environment is Visual C++ 2003 Standard Edition.

According to MSDN concerning the Properties view in Visual Studio Link[^]

Overrides

Lists all virtual functions for the selected class
and allows you to add or delete overriding functions.

However, I have a class that derives from a class that derives from CObject. The object that derives from CObject has mostly virtual functions. However, if I click on any class, I cannot see those virtual functions in my properties view/overrides section. I only see the overrides for CObject regardless of the class selected.

Is it incorrect to expect my derived class' virtual functions to appear in the overrides section?

Re: Missing Virtual Functions in Properties/Overrides

prasad_som13-Sep-06 19:18

prasad_som

13-Sep-06 19:18

Seems like, it shows overridables from MFC classes only. But not mentioned in its description.

Prasad
Notifier using ATL

Re: Missing Virtual Functions in Properties/Overrides

bob1697214-Sep-06 3:21

bob16972

14-Sep-06 3:21

That appears to be the way it's behaving. Frown | :(

I am holding out hope that I'm not doing something right but it's becoming apparent that it's designed to only show their stuff.

Anyway, Thanks for the reply

C++ createProcess wceload on PocketPC [modified]

sMaggi13-Sep-06 6:41

sMaggi

13-Sep-06 6:41

Some of our users do not have a desktop computer, so myApp installs itself on the PocketPC using Autorun.exe. Currently I have a CF1 (compact framework) install program. I am upgrading myApp to CF2 so I need to write a C++ app to install the CF2 CAB file, then call my CF1 based install app to finish the program installation.

I have created a VS 2005 Wind32 Smart Device Project console program for autorun.exe. The return value from CreateProcess is 0, the lastError value is 87. Any help would be appreciated.

void _tmain( VOID )
{
STARTUPINFO si;
PROCESS_INFORMATION pi;

LPTSTR szCmdline=_tcsdup(TEXT("\"wceload \\2577\\NETCFv2.ppc.armv4.cab\""));

ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
ZeroMemory( &pi, sizeof(pi) );

BOOL res=CreateProcess( NULL, // No module name (use command line)
szCmdline, // Command line
NULL, // Process handle not inheritable
NULL, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
NULL, // Use parent's environment block
NULL, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi ); // Pointer to PROCESS_INFORMATION structure

int lastError;

// Start the child process.
if( !res)
{
lastError = GetLastError()
printf( "CreateProcess failed (%d).\n", GetLastError() );
return;
}

// Wait until child process exits.
WaitForSingleObject( pi.hProcess, INFINITE );

// Close process and thread handles.
CloseHandle( pi.hProcess );
CloseHandle( pi.hThread );
}

-- modified at 13:04 Wednesday 13th September, 2006

image as background in ListView

Sigmac13-Sep-06 6:23

Sigmac

13-Sep-06 6:23

Hallo, insted of my previes questien, can any one tell me a way to put image as background in a ListView in Bordlan c++??

Sorry for bad english!
Greatings
Sigmac

Re: image as background in ListView

Michael Dunn13-Sep-06 7:37

Michael Dunn

13-Sep-06 7:37

You can do that with LVM_SETBKIMAGE

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: image as background in ListView

Sigmac13-Sep-06 8:45

Sigmac

13-Sep-06 8:45

Ok, thansk, but i have no eksperiens in coding beyond drag drop element, i have fount this code on the Net Perform() is it whit this?
And how?

Greatings
Sigmac
Sorry for bad english

Re: image as background in ListView

Sigmac13-Sep-06 11:16

Sigmac

13-Sep-06 11:16

I have solved the problem.

in event CustomDraw in ListView1

Graphics::TBitmap *pBitmap = new Graphics::TBitmap();
try{
pBitmap->LoadFromFile("ikke-navngivet.bmp");
Canvas->Draw(0,0,pBitmap);
pBitmap->TransparentMode = tmAuto;
Canvas->Draw(50,50,pBitmap);
}
catch (...){
ShowMessage("Could not load or display bitmap");
}
ListView1->Canvas->StretchDraw(ARect,pBitmap)
delete pBitmap;

Gratings
Sigmac
Sorry for bad english

CScrollView to BitMap File

georgekjolly13-Sep-06 5:16

georgekjolly

13-Sep-06 5:16

Hi all,

I have a class inherited from CScrollView, and I have drawn
some lines,circle and text on it using it's device context.

Now What I want to do is to save all these pictures as a single bitmap file , How can I achieve it ,

Please Help me

Thanks in Advance

George K Jolly

Re: CScrollView to BitMap File

Hamid_RT14-Sep-06 8:53

Hamid_RT

14-Sep-06 8:53

Do you want to save shapes on device context in a graphic file like bmp,right?

WhiteSky

Re: CScrollView to BitMap File

georgekjolly14-Sep-06 22:36

georgekjolly

14-Sep-06 22:36

Yes

Re: CScrollView to BitMap File

Hamid_RT15-Sep-06 1:22

Hamid_RT

15-Sep-06 1:22

If you have a hbitmap handle one easy way is use CImage class you attach this handle to this class and use of CImage::Save for save graphic file(bmp/jpg,etc)

WhiteSky

Using .obj created in VC++ in MASM

Piteco13-Sep-06 4:52

Piteco

13-Sep-06 4:52

Hello guys Big Grin | :-D

I have a question: remember SpecialFX? Great water effect in images Big Grin | :-D

....

Well, i wanna put this effects in my source in MASM (Macro Assembler).

Is possible using .obj? How can i call function? mangled names?

Tnx a lot.

Could anyone expain the "Static" to me

bloodwinner13-Sep-06 4:27

bloodwinner

13-Sep-06 4:27

I checked msdn, and got this
"Objects and variables declared as static retain their values for the duration of the program’s execution"....

but still don't know what is exactly the difference between declaring "int a" and "static int a", what is the difference when using them?

Re: Could anyone expain the "Static" to me

led mike13-Sep-06 4:33

led mike

13-Sep-06 4:33

One difference is that a static variable is assigned a memory address before the applications code executes. A local variable is not pushed onto the stack until that function is entered.

led mike

Re: Could anyone expain the "Static" to me

toxcct13-Sep-06 4:35

toxcct

13-Sep-06 4:35

int i
your variable will be created when the execution reaches this line, and it will be destroyed when leaving the scope.

static int i
your variable will be created when the program starts (whereever the statement is placed) and will be destroyed when the program exits.

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Could anyone expain the "Static" to me

bloodwinner13-Sep-06 5:01

bloodwinner

13-Sep-06 5:01

again, I am still confusing...

is that
int i:
it will be ready when you start use it

static int i:
it will be ready long before you use it

So what's the use of the latter occasion? Since I don't use it, why should I care when it is created.

Re: Could anyone expain the "Static" to me

toxcct13-Sep-06 5:12

toxcct

13-Sep-06 5:12

static has another meaning. when you declare a variable local to a function as static, then is keeps its last value :

void foo() {
    static int i = 0;
    i++;
    printf("%d\n", i);
}
 
void main() {
    for (int n = 0; n < 5; n++) {
        foo();
    }
}

this prints :

1<br />
2<br />
3<br />
4<br />
5

another meaning is when you declare a class data member as static. this means that the member is shared between every instances of the class. this is useful when you want a member to be unique, like an instances counter, class constants, etc...

the last meaning is when declaring a class member function as static. it will tell that the function is a class function ; it doesn't know a particuliar instance (no this pointer), it performs general operations...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Could anyone expain the "Static" to me

Lilith.C13-Sep-06 17:45

Lilith.C

13-Sep-06 17:45

bloodwinner wrote:
again, I am still confusing...

is that
int i:
it will be ready when you start use it

static int i:
it will be ready long before you use it

So what's the use of the latter occasion? Since I don't use it, why should I care when it is created.

Imagine a function that animates something on the screen. Each call to the function updates the phase of the animation by using a counter to determine what's displayed. To this end you need an int as the counter and you declare it inside the function rather than having your primary program pass the counter to the function. If you declare the int as non-static but you increment the int each time you enter the function the value of the int goes away because the variable was created on the stack when the function began and it was removed when the function ended.

If you declare the int as static, whatever value it had on exit from the function is the value it will have when you call the function again because the variable was created before the program began execution and will not be destroyed until the program ends.

Lilith

Re: Could anyone expain the "Static" to me

Akt_4_U13-Sep-06 17:49

Akt_4_U

13-Sep-06 17:49

A Static variable has a global scope. So if the value of static variable changed, that change will occur where ever the static variable is used.

Akkott

Re: Could anyone expain the "Static" to me

Hamid_RT14-Sep-06 8:53

Hamid_RT

14-Sep-06 8:53

See static Methods and Variables
[^] and here[^]

WhiteSky

Internal working of Try/Catch

DavJes13-Sep-06 4:26

DavJes

13-Sep-06 4:26

Hi,

Can any tell me the internal working of the try/catch block in C++.

Thanks.

Re: Internal working of Try/Catch

led mike13-Sep-06 4:35

led mike

13-Sep-06 4:35

Try this article[^]

led mike

MySQL with MFC

dcb123456713-Sep-06 4:18

dcb1234567

13-Sep-06 4:18

when i run MFC and MySQL
By Victor M. Valenzuela.
MFC classes to fill ComoBoxes & ListBoxes with MySQL data.
then it gives following error, i am not able to trace out this error,
as far as i am concerened here two files are conflicting.
how to avoid this conflicting problem.
i am solving this problem from last 4 days, but i didn't found any clue about this problem.
please tell me the solution i am very needy.
Linking...
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "class std::basic_ostream<char,struct std::char_traits<char=""> > & __cdecl std::operator<<(class std::basic_ostream<char,struct std::char_traits<char=""> > &,char const *)" (??6std@@YAAAV?$basic_ostream@DU?$cha
r_traits@D@std@@@0@AAV10@PBD@Z) already defined in mysql++.lib(manip.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_ios<char,struct std::char_traits<char=""> >::~basic_ios<char,struct std::char_traits<char=""> >(void)" (??1?$basic_ios@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined
in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_streambuf<char,struct std::char_traits<char=""> >::~basic_streambuf<char,struct std::char_traits<char=""> >(void)" (??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAE@XZ
) already defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >(void)" (??1?$basic_strin
g@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in mysql++.lib(connection.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >(class std::basic_string<c
har,struct std::char_traits<char="">,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in mysql++.lib(connection.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >(class std::allocator<char
> const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV?$allocator@D@1@@Z) already defined in mysql++.lib(connection.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_iostream<char,struct std::char_traits<char=""> >::~basic_iostream<char,struct std::char_traits<char=""> >(void)" (??1?$basic_iostream@DU?$char_traits@D@std@@@std@@UAE@XZ) a
lready defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_iostream<char,struct std::char_traits<char=""> >::basic_iostream<char,struct std::char_traits<char=""> >(class std::basic_streambuf<char,struct std::char_traits<char=""> > *)" (??0?$b
asic_iostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z) already defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: char const * __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::c_str(void)const " (?c_str@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@Q
BEPBDXZ) already defined in mysql++.lib(connection.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: char & __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::operator[](unsigned int)" (??A?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEA
ADI@Z) already defined in mysql++.lib(field_names.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::_Lockit::~_Lockit(void)" (??1_Lockit@std@@QAE@XZ) already defined in mysql++.lib(sql_query.obj)
libcp.lib(iostream.obj) : error LNK2005: "public: __thiscall std::ios_base::Init::Init(void)" (??0Init@ios_base@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(iostream.obj) : error LNK2005: "public: __thiscall std::ios_base::Init::~Init(void)" (??1Init@ios_base@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(iostream.obj) : error LNK2005: "public: __thiscall std::basic_ostream<char,struct std::char_traits<char=""> >::basic_ostream<char,struct std::char_traits<char=""> >(class std::basic_streambuf<char,struct std::char_traits<char=""> > *,bool,bool)" (?
?0?$basic_ostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@_N1@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::_Locinfo(char const *)" (??0_Locinfo@std@@QAE@PBD@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::~_Locinfo(void)" (??1_Locinfo@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale0.obj) : error LNK2005: "public: class std::locale::facet const * __thiscall std::locale::_Getfacet(unsigned int,bool)const " (?_Getfacet@locale@std@@QBEPBVfacet@12@I_N@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale0.obj) : error LNK2005: "public: bool __thiscall std::locale::_Iscloc(void)const " (?_Iscloc@locale@std@@QBE_NXZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale0.obj) : error LNK2005: "private: static class std::locale::_Locimp * __cdecl std::locale::_Init(void)" (?_Init@locale@std@@CAPAV_Locimp@12@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(ios.obj) : error LNK2005: "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@QAEXH_N@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(ios.obj) : error LNK2005: "public: virtual __thiscall std::ios_base::~ios_base(void)" (??1ios_base@std@@UAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(ios.obj) : error LNK2005: "protected: void __thiscall std::ios_base::_Init(void)" (?_Init@ios_base@std@@IAEXXZ) already defined in msvcprtd.lib(MSVCP60D.dll)
LIBC.lib(strtol.obj) : error LNK2005: _strtol already defined in msvcrtd.lib(MSVCRTD.dll)
LIBC.lib(crt0dat.obj) : error LNK2005: _exit already defined in msvcrtd.lib(MSVCRTD.dll)
LIBC.lib(crt0dat.obj) : error LNK2005: __exit already defined in msvcrtd.lib(MSVCRTD.dll)
LIBC.lib(crt0init.obj) : error LNK2005: ___xc_z already defined in msvcrtd.lib(cinitexe.obj)
LIBC.lib(crt0init.obj) : error LNK2005: ___xc_a already defined in msvcrtd.lib(cinitexe.obj)
LIBC.lib(crt0init.obj) : error LNK2005: ___xi_z already defined in msvcrtd.lib(cinitexe.obj)
LIBC.lib(crt0init.obj) : error LNK2005: ___xi_a already defined in msvcrtd.lib(cinitexe.obj)
LIBC.lib(atox.obj) : error LNK2005: _atoi already defined in msvcrtd.lib(MSVCRTD.dll)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: __setmbcp already defined in LIBC.lib(mbctype.obj)
LINK : warning LNK4098: defaultlib "msvcrtd.lib" conflicts with use of other libs; use /NODEFAULTLIB:library
LINK : warning LNK4098: defaultlib "LIBC" conflicts with use of other libs; use /NODEFAULTLIB:library
LIBC.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/DlgMySql.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

mee

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.