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Float to CString:
mystring.Format("%.2f", myfloat);
CString to float
myfloat to atof(mystring);
I *believe* the _T makes the string Unicode ? It's something *like* that, and is certainly superfluous in my experience ( i.e. I've never needed to do it or broken anything by not doing it )
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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Thank you, very, very much.
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_T(x) is a macro that that makes a string literal Unicode compliant.
from TChar.h
#define _T(x) __T(x)
#define _TEXT(x) __T(x)
and elsewhere in TChar.h
#ifdef _UNICODE
...
#define __T(x) L ## x
...
#else
...
#define __T(x) x
...
#endif
so _T("Icon") becomes
"Icon" if _UNICODE is not defined,
and L"Icon" if _UNICODE is defined
So if you are not writing a Unicode app, there is no difference between the two function calls, but if you are using Unicode, there is a definite difference.
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Another difference.
If you are writing a UNICODE application, it runs on NT/2000/XP only.
If you are writing an MBCS/SBCS application, it runs on all the operating systems,
and when run on NT/2000/XP the MBCS/SBCS application will run slower than the
UNICODE application because all MBCS/SBCS strings are converted to UNICODE
strings at the Win32 API boundary. Matt Pietrek wrote an article on this years ago.
So, Christian, for your Win NT/2000 applications, maybe you should make a UNICODE
build?
Slight Aside: If you are doing many multilanguage apps, there are so MBCS only bugs
out there which will bring the box to its knees (the debugger doesn't even get a chance).
Stephen Kellett
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How can i export Constants from a VC Dll.Actually the constants used are defined within a header file that is included in this project !!
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by constants i assume you mean #define whatever whatever
so you either include the header file throughout the project or copy the constants into the new project
---
"every year we invent better idiot proof systems and every year they invent better idiots"
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I hope to know how to associate imagelist control to listview control version 6 in VC++.
I know how to do it in listview 5 by the macro. And i know how to do it in VB by the listview's property sheet.
But in VC++ i can't associate the imagelist 6 to listview 6 at design time. The dropdown list of the imagelist has only one item of NULL. And I don't know how to associate dynamically. For the wrapper class of listview6 has a function of SetSmallIcons(LPDISPATCH). But how can i get the LPDISPATCH from the wrapper class of imagelist?
My project uses a lot of list view 6. so if i change to list view 5, we need to revise a lot of code.
Thanks in Advance
Liu Jun
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With your CListCtl call:
thumbListCtl.SetImageList(&thumbList, LVSIL_NORMAL);
where thumbList is of type CImageList
There's a tutorial around somewhere on how to do this... might be on CodeGuru. Do a search for "thumbnail". If you need more help I can send you the source to my function which loads from a database, but you should be able to work it out...
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I have a dos program (like dos program).
I want to exec this program from visualc but i do not want that that dos_program shows a
its window.
thx.
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use
ShellExecute(m_hWnd, "open", your_programs_name, parameters, defaul_folder, SW_HIDE);
Mustafa Demirhan
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HI
Strange kind of class
Some times I see this class like below :
LINE 1 : class CImage;
LINE 2 : class CTestpicDlg : public CDialog
LINE 3 : {
LINE 4 : // Construction
LINE 5 : public:
LINE 6 : void draw();
LINE 7 : CImage *image;
LINE 8 : CTestpicDlg(CWnd* pParent = NULL); // standard constructor
LINE 9 : }
So my question is about two thing's :
1- (CImage)class ,it hasn't any braces and !!!
2- The (CImage)class defined in cimage.lib which I append it in my project
so why I must write LINE 1, if I omit this line I get alot of errors like :
error C2143: syntax error : missing ';' before '*'
error C2501: 'CImage' : missing storage-class or type specifiers
Thank you ...
AHMAD ALWASHALI
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LINE 1: Class CImage; is a forward reference to another class that lets the CTestPicDlg class know what to do with the LINE 7: CImage *image ptr type ... excluding LINE 1: gives compile errors cos the compiler then doesnt know what CImage is
---
"every year we invent better idiot proof systems and every year they invent better idiots"
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Thank you lauren
but (CImage)class defined in cimage.lib which I append it in my project
can you tell me please
AHMAD ALWASHALI
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The compiler can't know anything about classes inside .lib files, they are only used in the link phase. The CImage class must be declared in a source file (.cpp or .h) so that the compiler can see it.
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HI
One day ,the weather is very nice ,every thing
working properly .
When I work in my project by visual c++6 , but!!!
suddenly ominous message appeared it's tell me that :
Out of memory
I don't know what I did ,my project is very small.
When I open my project by (.dsw) nothing appear and
by (.dsp) the ominous message appear ...
any one can help me please ...
Thank you ...
AHMAD ALWASHALI
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I'd hazard a guess and say you're developing under Win9x.
I had the same thing a little while ago (I'd never seen it before, even on much larger projects).
The solution I found was to setup the virtual memory settings myself, rather than let the OS manage it (actually, this isn't a bad idea on a development machine, since it can reduce swapfile fragmentation).
I hope this helps!
Andy Metcalfe - Sonardyne International Ltd
(andy.metcalfe@lineone.net)
http://www.resorg.co.uk
"I used to be a medieval re-enactor, but I'm (nearly) alright now..."
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HI
Question about IPicture
As I know IPicture class can work whith custom types which
I can find it in PICTYPE enumeration (look in MSDN)
but when I went to
codeproject>> Bitmaps & Palettes >> Bitmaps
and then( Simple class for drawing pictures )
I found I can load other types like jpg, tif, gif(but tif didn't work)
Is this secrets so it most didn't apear in MSDN or what !!!
Thank you ...
AHMAD ALWASHALI
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Hi,
Can I lock an edit box , say a password field such that no other application can acess the contents of that field.
Thanks
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Interesting question. I suppose you could subclass the window and watch for WM_GETTEXT messages, and return an empty string or "sodoff" or whatever you want.
Oh, you should handle WM_GETTEXTLENGTH as well, to hide the length of the text.
--Mike--
http://home.inreach.com/mdunn/
The preferred snack of 4 out of 5 Lounge readers.
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"sodoff" ... rofl ... thats cute
---
"every year we invent better idiot proof systems and every year they invent better idiots"
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Hi!
Is this in any ways related to Cracking? If so, there would not be any chance if the NuMega SoftIce is around (most of the time is)!
As for Mike's post, still the WM_GETTEXTxxx will be caught and user/programmer will get the edit box's contents just coz it is a message and will be possible to set a break on it!
As I mentioned above, if it is Cracking related, then perhaps you could try using other methods rather than plain edit box, lock and even masking it with the * characters, you may know that the * are easily revealed. There is an article on coeguru I guess with source/demo.
Good Luck!
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Hello,
I'm new to visual development and am stuck. I've got a main app window with several children in it. The children are DirectShow movie windows and dialog boxes I created to control the movies. When a play button is clicked I need to know which dialog box the command came from, to play the correct movie, how do I do this?
I tried to get the active window and figure it out that way but my child windows are never active, only the main parent window. If I could change this so that the dialog box where the command comes from is active things would be ok, does anyone know if this is possible?
Thanks for any help!
luedee@yahoo.com
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Sounds like each dialog is built from the same template, so their control IDs are all the same. Hmmm...
Well, if the dialog with the play button knows what movie to play (or has some distinguishing data) you could set up a custom windows message that would be posted when the play button is hit. Create a handler in the main wind (perhaps using ON_MESSAGE macro, if MFC) to get all these notifications. When you post the message inside OnPlay, the wparam or lparam can be set with some indication of who posted the message, and your main handler can switch on that.
I know this is a little short on detail, but I think if you search this forum for ON_MESSAGE you'll get some tips.
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I'm coming to the end of my inaugural WTL project and I've hit an odd snag. I am filling a listctrl with ID3 tages, editing them and writing them out again. I'm using someone elses ID3 class ( although it needed so much work I may as well have written it ;0) and it will NOT append a file with ID3V1 information for me. As soon as the info is there, I can overwrite it, but otherwise, I just cannot write to the file. It's not read only, and I've tried using
SetFilePointer(fHandle, 128, 0, FILE_END);
SetEndOfFile(fHandle);
SetFilePointer(fHandle, -128, 0, FILE_END);
if (!WriteFile(fHandle, "TAG", 3, &sentinel, 0))
WriteFile(fHandle, myID3.title, 30, &sentinel, 0);
WriteFile(fHandle, myID3.band, 30, &sentinel, 0);
WriteFile(fHandle, myID3.album, 30, &sentinel, 0);
WriteFile(fHandle, myID3.year, 4, &sentinel, 0);
WriteFile(fHandle, myID3.comment, 30, &sentinel, 0);
WriteFile(fHandle, &myID3.genre[0], 1, &sentinel, 0);
SetFilePointer(fHandle, 128, 0, FILE_END);
and various permutations of this, and also
CloseHandle(fHandle);
ofstream stream;
stream.open(filepath, ios::app);
stream.setmode(filebuf::text);
stream << "TAG";
stream << myID3.title;
stream << myID3.band;
stream << myID3.album;
stream << myID3.year;
stream << myID3.comment;
stream << &myID3.genre[0];
stream.close();
Can someone please tell me if I am doing something wrong, or suggest why this is not appending my file ? I've traced through and this code executes whenever a tag is not present, but nothing is being done.
Thanks.
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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Those API calls must be failing left and right - look at the return values and the value of GetLastError() to see what's going wrong.
--Mike--
http://home.inreach.com/mdunn/
The preferred snack of 4 out of 5 Lounge readers.
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