567890123410-Jul-02 19:43

10-Jul-02 19:43

You get Region class instance which is wrapper for HRGN and works like MFC CRgn. You can work with it as with instance of any other class.

What is the diff. between GDI and GDI+?

Srini Kella11-Jul-02 8:33

Srini Kella

11-Jul-02 8:33

What is the diff. between GDI and GDI+?

Re: What is the diff. between GDI and GDI+?

NormDroid11-Jul-02 9:01

NormDroid

11-Jul-02 9:01

GDI is the base graphical system that comes with Windows XP/2K/NT/ME etc.
If supports base drawing primatives and has limited image support.

GDI+ is shipped as a DLL which you can use in your application for 2K/NT/ME this must be shipped with your app. (~1.6mb). What you give is rich support for images, gradient brushes, text etc. etc. The programming model also simplifies the use of GDI:

EXAMPLE:

WCHAR string[] =
L"Draw text in a rectangle by passing a RectF to the DrawString method.";

FontFamily fontFamily(L"Arial");
Font font(&fontFamily, 12, FontStyleBold, UnitPoint);
RectF rectF(30.0f, 10.0f, 100.0f, 122.0f);
SolidBrush solidBrush(Color(255, 0, 0, 255));

graphics.DrawString(string, -1, &font, rectF, NULL, &solidBrush);

Pen pen(Color(255, 0, 0, 0));
graphics.DrawRectangle(&pen, rectF);
...

GDI+ is supported by .NET by default.

Normski. - Professional Windows Programmer

Thank you very much.

Srini Kella11-Jul-02 10:28

Srini Kella

11-Jul-02 10:28

Thank you verymuch for your detailed response.

Re: What is the diff. between GDI and GDI+?

Jay Beckert11-Jul-02 16:30

Jay Beckert

11-Jul-02 16:30

I like the GDI+ compared to GDI just for the image support alone. I still find it confusing since to me it seems you have to convert some things to GDI+. For example Rect to Crect when you use GetClientRect() or creating a bmp with CreateCompatibleBitmap() then using the HBITMAP handle for GDI+ Bitmap::FromHBITMAP(). Or am I missing something?

Other than that I love the new bush and image classes.

Re: What is the diff. between GDI and GDI+?

Jay Beckert12-Jul-02 8:18

Jay Beckert

12-Jul-02 8:18

It's actually making sense to me now. The graphics object is associated with a dc then you can use that graphics object to draw, paint or what ever you can dream of. You can even have multiple graphics objects associated with a dc and each one is independent which I think is pretty cool.
I was trying to use multiple dc's associated with multiple graphics objects and wondering why each object I had was independent. LOL

It's just one big wrapper for GDI. Looks like MS is trying to integrate GDI+ more closely to DirectX.

Re: What is the diff. between GDI and GDI+?

NormDroid12-Jul-02 11:31

NormDroid

12-Jul-02 11:31

Jay
If this makes you feel any better, I wrote my 2nd windows app. a tile puzzle game similar to the apple one. I tried to use a DC for each tile... No No No. any way a good way of learning Win32/GDI I still have the source code 'circa 93 maybe a good time to revamp and submit as a codeproject app. Unsure | :~

Normski. - Professional Windows Programmer

Re: What is the diff. between GDI and GDI+?

Jay Beckert12-Jul-02 18:30

Jay Beckert

12-Jul-02 18:30

I keep maintaining a 2D chat client/server app and every time I set out to learn something new or better I apply it to my app. It was my first windows app that I attempted. My wife likes these 2D chats and their kinda of fun. I told her I could program one better. Wink | ;)

Three years later and I'm still making it better. Unsure | :~

LOL

I was a big windows hater in the beginning and was determined to stay Unix/Linux or Dos based - that quickly changed when I seen the bigger paycheck. So everything for a reason. Since going for the windows based work I'd have to say I'v learned more than ever from the experience. It would be cool to see how you did your game - That is if you really want to give it up.

I might do another app for codeproject dealing with unlimited dynamic menu sub items for a bookmark idea I did. Sort of like IE explorer. I never seen decent examples of that. Anyways I'm rambling on. Sleepy | :zzz:

Cheers Norm

CFileDialog, user specify directory only ?

Robert Palma Jr.10-Jul-02 9:46

Robert Palma Jr.

10-Jul-02 9:46

I would like to use the CFileDialog class to allow a user to navigate-to and specify a directory. My program will write a file to this directory at a future time, in other words it is not a simple 'immediately save a file' situation.

How can this be done?

I've used CFileDialog quite a bit for finding 'files' and saving 'files' but not finding a directory.

TIA ! Smile | :)

Re: CFileDialog, user specify directory only ?

Michael Dunn10-Jul-02 10:12

Michael Dunn

10-Jul-02 10:12

Use SHBrowseForFolder

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: CFileDialog, user specify directory only ?

Robert Palma Jr.10-Jul-02 11:21

Robert Palma Jr.

10-Jul-02 11:21

Thanks Mike.... almost got it working Smile | :)

I'm a bit confused on the pidlroot, ITEMIDLIST for specifying the starting directory.

How exactly do I put a null string or a class string with the start path into this function?

TIA Smile | :)

Re: CFileDialog, user specify directory only ?

Michael Dunn11-Jul-02 16:10

Michael Dunn

11-Jul-02 16:10

It's easier to provide a callback function and set the starting dir there. Check out the wrappers classes here at CP, any wrapper worth its salt will have the code to do this, which you can then copy. Smile | :)

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: CFileDialog, user specify directory only ?

Desmond Mardle10-Jul-02 11:23

Desmond Mardle

10-Jul-02 11:23

Hi you can specify the path in the constructor to the directory. You can then set a flag in the constructor to default to the dirctory you have specified.

CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL );

Parameters

bOpenFileDialog

Set to TRUE to construct a File Open dialog box or FALSE to construct a File Save As dialog box.

lpszDefExt

The default filename extension. If the user does not include an extension in the Filename edit box, the extension specified by lpszDefExt is automatically appended to the filename. If this parameter is NULL, no file extension is appended.

lpszFileName

The initial filename that appears in the filename edit box. If NULL, no filename initially appears.

dwFlags

A combination of one or more flags that allow you to customize the dialog box. For a description of these flags, see theOPENFILENAME structure in the Win32 SDK documentation. If you modify the m_ofn.Flags structure member, use a bitwise-OR operator in your changes to keep the default behavior intact.

lpszFilter

A series of string pairs that specify filters you can apply to the file. If you specify file filters, only selected files will appear in the Files list box. See the Remarks section for more information on how to work with file filters.

pParentWnd

A pointer to the file dialog-box object’s parent or owner window.

Remarks

Call this function to construct a standard Windows file dialog box-object. Either a File Open or File Save As dialog box is constructed, depending on the value of bOpenFileDialog.

To allow the user to select multiple files, set the OFN_ALLOWMULTISELECT flag before calling DoModal. You need to supply your own filename buffer to accommodate the returned list of multiple filenames. Do this by replacing m_ofn.lpstrFile with a pointer to a buffer you have allocated, after constructing the CFileDialog, but before calling DoModal. Additionally, you must set m_ofn.nMaxFile with the number of characters in the buffer pointed to by m_ofn.lpstrFile.

To allow the user to resize an Explorer-style dialog box using either the mouse or keyboard, set the OFN_ENABLESIZING flag. Setting this flag is necessary only if you provide a hook procedure or custom template. The flag works only with an Explorer-style dialog box; old-style dialog boxes do not permit resizing.

The lpszFilter parameter is used to determine the type of filename a file must have to be displayed in the file list box. The first string in the string pair describes the filter; the second string indicates the file extension to use. Multiple extensions may be specified using ‘;’ as the delimiter. The string ends with two ‘|’ characters, followed by a NULL character. You can also use a CString object for this parameter.

For example, Microsoft Excel permits users to open files with extensions .XLC (chart) or .XLS (worksheet), among others. The filter for Excel could be written as:

I will send you an example tomorrow when I return to work.

Hope this helps

Des Mardle

Re: CFileDialog, user specify directory only ?

Desmond Mardle11-Jul-02 4:43

Desmond Mardle

11-Jul-02 4:43

Hears a constructor I use to specify a directory and a file type

CFreqInfoFile pFreqInfoFile(FALSE,"fqu","c:\\frequency data\\*.fqu", N_EXPLORER | OFN_OVERWRITEPROMPT,"Freq Data(.fqu)",pParent);

pFreqInfoFile.DoModal(); // to display dialog box

Des Mardle

Re: CFileDialog, user specify directory only ?

Robert Palma Jr.11-Jul-02 10:36

Robert Palma Jr.

11-Jul-02 10:36

Thank-you for all of your help, Des Smile | :)

Mem Usage???

Srini Kella10-Jul-02 9:17

Srini Kella

10-Jul-02 9:17

Guys:

How will the NT-TaskManager gets the "Mem Usage" bytes? Is there any API(s) for that?

thanks

Re: Mem Usage???

DanielP10-Jul-02 9:26

DanielP

10-Jul-02 9:26

I think VirtualQueryEx()

help with templates and __declspec(dllexport)

Roman Nurik10-Jul-02 9:13

Roman Nurik

10-Jul-02 9:13

** NOTE: im working in Visual Studio .NET **

im having two problems relating to templates and the __declspec(dllexport) keywords or directives or whatever you call em

Problem 1

im using std::vector<int> in combination with __declspec(dllexport) when im making an exported class that uses the vector in a DLL project

my code:

struct __declspec(dllexport) MyStruct
{
   int a, b;
};


extern template class __declspec(dllexport) std::vector<MyStruct>;


class __declspec(dllexport) MyClass
{
private:
  std::vector<MyStruct> m_vec;

public:
  // more code here
}

when i try to compile, i get a warning:

c:\Program Files\Microsoft Visual Studio .NET\Vc7\include\vector(35) : warning C4251: 'std::_Vector_val<_Ty,_Alloc>::_Alval' : class 'std::allocator<_Ty>' needs to have dll-interface to be used by clients of class 'std::_Vector_val<_Ty,_Alloc>'
        with
        [
            _Ty=MyStruct,
            _Alloc=std::allocator<MyStruct>
        ]
        and
        [
            _Ty=MyStruct
        ]
        and
        [
            _Ty=MyStruct,
            _Alloc=std::allocator<MyStruct>
        ]
        C:\CPP\Test.h(9) : see reference to class template instantiation 'std::vector<_Ty,_Ax>' being compiled
        with
        [
            _Ty=MyStruct,
            _Ax=std::allocator<MyStruct>
        ]

can someone tell me why the hell that happens if i already used __declspec(dllexport)???

Problem 2

my second problem is an error, not a warning. (to me, warnings are just as bad as errors)

i declare an exported template function like so:

template <class T> __declspec(dllexport) void MyFunction(T tData);

and when i use it, i get an unresolved external!

any ideas?

- Roman -

Re: help with templates and __declspec(dllexport)

Joaquín M López Muñoz10-Jul-02 9:34

Joaquín M López Muñoz

10-Jul-02 9:34

Problem 1: The message seems rather indicative. Try exporting the allocator as well, with something like:

extern template class __declspec(dllexport) std::allocator<MyStruct>;

prior to instantiating the vector.

Problem 2: You need to instantiate MyFunction for the types you're interested in. Not sure about the syntax, but I guess it'll be something like:

//instantiate MyFunction for ints
template void MyFunction(int);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: help with templates and __declspec(dllexport)

Roman Nurik10-Jul-02 9:36

Roman Nurik

10-Jul-02 9:36

thanks! i nailed down problem 2, but even with the allocator, the first problem is still bitching

- Roman -

Re: help with templates and __declspec(dllexport)

Roman Nurik10-Jul-02 9:38

Roman Nurik

10-Jul-02 9:38

oh wait, it worked for problem 1 also

THANKS!

- Roman -

CArray problem with VS.Net

LukeV10-Jul-02 9:11

LukeV

10-Jul-02 9:11

I'm trying to use the CSMTPConn class in VS.Net but I get compile errors because of this:

CArray<csmtpaddress,csmtpaddress&> m_ToRecipients;

m:\apps\Utils\CSMTPConn\Smtp.h(147): error C2143: syntax error : missing ';' before '<'

What is happening??? Confused | :confused:

I havent't changed the code at all!!!

---------------
http://www.edovia.com

Re: CArray problem with VS.Net

LukeV10-Jul-02 9:19

LukeV

10-Jul-02 9:19

never mind, i was just missing some includes...

---------------
http://www.edovia.com

Toggle Window/Control Visibility?

clintsinger10-Jul-02 9:03

clintsinger

10-Jul-02 9:03

Using the standard Win API how does one toggle between a window being Visible or Invisible? For example, how would one show/hide a button? Please include an example.

Thanks,
Clint

Re: Toggle Window/Control Visibility?

DanielP10-Jul-02 9:10

DanielP

10-Jul-02 9:10

hide it:

::ShowWindow( hwnd, SW_HIDE );

show it:

::ShowWindow( hwnd, SW_SHOW );

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

C / C++ / MFC

Problem 1

Problem 2