C / C++ / MFC

14-Nov-05 2:42

hi all,
if two funcions in one class ,their parameter type and numbers are same ,but only the return type is different ,the two functions belong overload?
thx

vivid

jhwurmbach14-Nov-05 3:02

jhwurmbach

14-Nov-05 3:02

Tder wrote something like:
if two functions in one class are the same, but differ only in return type

That is illegal by the C++-standard.
Different functions must have a differing paramater list or constness.

VC7.1 raises error C2556 "'identifier' : overloaded functions only differ by return type"

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

vividwu14-Nov-05 3:08

14-Nov-05 3:08

if when compiling ,there is a error

vivid

Bob Stanneveld14-Nov-05 4:56

Bob Stanneveld

14-Nov-05 4:56

Hello,

Whether two functions should be overloaded or not should not be determined by the parameter list. Functions should only be overloaded if they do the same thing with different parameters!

The following example illustrates:

class DoOverload
{
public:
    // The following methods should be combined and overloaded
    void AddOneInteger(int nValueToAdd);
    void AddTowIntegers(int nVal1, int nVal2);

    // into the following function
    void AddInteger(int nVal1);
    void AddInteger(int nVal1, int nVal2);
};

class DontOverload
{
public:
    // The following functions have the same parameters, but do 
    // different things. Therefore they should not be overloaded.
    void DoFoo(int i);
    void DoBar(int i);
};

Hope this helps Big Grin | :-D

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

vividwu15-Nov-05 1:18

15-Nov-05 1:18

if
void AddInteger(int nVal1); int AddInteger(int nVal1, int nVal2);
the two funciton belong overload?

vivid

Bob Stanneveld15-Nov-05 5:48

Bob Stanneveld

15-Nov-05 5:48

Hello,

Yes, the term would be that AddInteger() is overloaded for one parameter and for two parameters.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

vividwu15-Nov-05 12:21

15-Nov-05 12:21

no,my meaning is void AddInteger(int a) and int AddInteger(int a,int b);
their return type is different,they belong to overload?
thanks

vivid

Bob Stanneveld15-Nov-05 22:32

Bob Stanneveld

15-Nov-05 22:32

Hello,

Your return type can be different as long the function is overloaded by parameters.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Recycle bin thing

johny_d14-Nov-05 2:26

johny_d

14-Nov-05 2:26

Does anyone know how to get another "virtual folder" to My Compuer? What I mean is something like the Recycle Bin. - not visible to the user directly, but can be accessed via that icon in the Explorer.

Live long and in prosper

johny74656@gmail.com

Re: Recycle bin thing

Mike Dimmick14-Nov-05 2:46

Mike Dimmick

14-Nov-05 2:46

You'd have to write a shell namespace extension. See Michael Dunn's article "The Complete Idiot's Guide to Writing Namespace Extensions"[^].

Stability. What an interesting concept. -- Chris Maunder

Getting Image Size

raed14-Nov-05 1:48

raed

14-Nov-05 1:48

I have the following Image Object loaded from BITMAP HANDLE

Image *image = Bitmap::FromHBITMAP(hBitmap,NULL);

I need to get the Image size in bytes, how can I do this?

Re: Getting Image Size

YaronNir14-Nov-05 2:27

launching windows exploere in 'Film Strip' mode

14-Nov-05 2:27

since you have the hBitmap, i suggest you use:

CBitmap::GetBitmap(BITMAP)

the BITMAP structure contains the necessary information you desire...

hope this helps ya

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Getting Image Size

raed14-Nov-05 2:34

raed

14-Nov-05 2:34

the problem i do resize for image

image = ScaleByPercent(image,50);

so image will have a new size , then i saved the image object into IStream object as following :

<code>
CLSID encoderClsid;
GetEncoderClsid(L"image/jpeg", &encoderClsid);
image->Save(pStream,&encoderClsid,NULL);
</code>

any suggestion in getting the scaled image size in bytes.

<b>ScaleByPercent Function</b><code>
Image* ScaleByPercent(Image *imgPhoto, int Percent)
{
float nPercent = ((float)Percent/100);
int sourceWidth = imgPhoto->GetWidth();
int sourceHeight = imgPhoto->GetHeight();
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap *bmPhoto = new Bitmap(destWidth, destHeight);
bmPhoto->SetResolution(imgPhoto->GetHorizontalResolution(),
imgPhoto->GetVerticalResolution());
Graphics *grPhoto = Graphics::FromImage(bmPhoto);
grPhoto->SetInterpolationMode(InterpolationModeHighQualityBicubic ) ;
RectF destRectA(destX, destY, destWidth, destHeight);
Unit srcunit = UnitPixel;
grPhoto->DrawImage(imgPhoto,destRectA,sourceX,sourceY,sourceWidth,sourceHeight,srcunit,NULL,NULL,NULL);
return bmPhoto;
}
</code>

Re: Getting Image Size

Mircea Puiu14-Nov-05 4:40

Mircea Puiu

14-Nov-05 4:40

Try using the PhysicalDimension property.
See here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdrawingbitmapmemberstopic.asp[^]

SkyWalker

YaronNir14-Nov-05 1:23

Re: launching windows exploere in 'Film Strip' mode

14-Nov-05 1:23

Hi all,

I am real desperate here cause there aren't any good documentation regarding the matter...

i am interested to launch windows explorer via code or command line, to be opened in my desired folder, in a 'film strip' mode...

heard i can use IFolderView or other shell objects, but couldn't find any good sample of doing such...
can any1 please show me piece of code on how it can be done?

thanks

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

David Crow14-Nov-05 2:33

David Crow

14-Nov-05 2:33

YaronNir wrote:
in a 'film strip' mode...

What's this?

"Take only what you need and leave the land as you found it." - Native American Proverb

Re: launching windows exploere in 'Film Strip' mode

YaronNir14-Nov-05 2:38

Re: launching windows exploere in 'Film Strip' mode

14-Nov-05 2:38

if you are using winXP,open My Documents-->My Pictures, choose in the 'View' Menu 'Film strip'

it shows the pictures in a special way, in the bottom, small thumbnails of the picture and in the middle, the selected picture in large...

i want to open such a window programatically (c++ or by command line)

really need help here

thanks
Yaron

Ask not what your application can do for you,
Ask what you can do for your application

[Message Deleted]

David Crow14-Nov-05 2:45

David Crow

14-Nov-05 2:45

[Message Deleted]

YaronNir14-Nov-05 2:45

Re: launching windows exploere in 'Film Strip' mode

14-Nov-05 2:45

it comes with winXP sp2....

Ask not what your application can do for you,
Ask what you can do for your application

David Crow14-Nov-05 3:00

David Crow

14-Nov-05 3:00

All you have to do is send the SHELLDLL_DefView window a WM_COMMAND message with a command ID of 0x702f.

"Take only what you need and leave the land as you found it." - Native American Proverb

Re: launching windows exploere in 'Film Strip' mode

YaronNir14-Nov-05 3:02