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Ok- basic question:
Ive downloaded source files and the accompanying .ocx file for use in a basic visual c++ project. The .ocx file works.
Now- when i edit the source files a bit to add new functuality, how the heck do I recompile them using visual studio into a brand new .0cx file??? Im lost on this aspect.
rich
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The same way you would any other program or dll.
If it came with a VC project file then that should not have a problem.
If it did not and it is VC code, you could try:
1) Create a new ALT COM AppWizard project, with the same name as the current ocx.
2) Add your files to the project. This will involve replacing the app-wizard generated files with your files.
3) Goto the project settings, find output file name (under the link tab) and replace the .dll extension with the .ocx extension.
4) Compile.
Suggestions (before you try above):
1) Create a simple ocx project, to get used to the process.
2) Try the above with copies of the original files, before using your modified files.
P.S. Andrew W. Troelsen is the author of a book on creating ALT COM (ocx) controls.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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1) Compile UNICODE version of app.
2) Copy character U+0428 from Character Map program.
3) Paste character in edit control, no problem.
4) Paste character in rich edit control, no problem.
5) Get text from edit control (TCHAR txt[128]):
txt[0] = 1064, txt[1] = 0;
6) Get text from rich edit control (TCHAR txt[128]):
txt[0] = 63, txt[1] = 10, txt[2] = 13;
Ok! What happened here?
The reverse is also true:
1) Set text in edit control (t[0]=1064,t[1]=0), no problem
2) Set text in rich edit control (t[0]=1064,t[1]=0), a problem. It displays '?', which is character 63.
Any ideas?
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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Maybe try calling EM_GETTEXTMODE and find out if the contorl somehow got set to using ANSI instead of Unicode. It seems that thecontorl might accept any text, but when you retreive the text, it will return text in the format set with EM_SETTEXTMODE. Also, perhaps text should bet set to it with EM_SETTEXTEX instead of WM_SETTEXT.
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Thanks! There does not seem to be a wrapper in the MFC control class for that one.
Text mode = TM_MULTICODEPAGE|TM_SINGLELEVELUNDO|TM_RICHTEXT;
The only thing I can determine from that, is that text is in richtext format. I believe that the rich edit control is entirely UNICODE internaly.
I am using GetRichEditCtrl().ReplaceSel(_T("some text")) only, to send text to the control.
I am using GetRichEditCtrl().GetLine(0,ubuf,128) only (as test), to get text from the control.
GetLine() retrieves wchar_t characters, but they are being translated to ANSI characters, when copied to the wchar_t array passed as an argument.
There is the possibility that it is a local problem, but that makes no since.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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I was just wondering, what is the proper way to embed data files within an exe in the VC++ development enviornment. I'd like to do it in a way that would allow the data to be accesed with a simple pointer if possible.
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Goto the resource window, right click and select import.
After it is imported you can get access to the data via its resource id number.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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Isn't there a way to feed the data file to the linker directly via a custom build setup? I'm trying to write my code so it'll be platform independant, so I wanted to avoid getting the windows resource sceme involved. Is there maybe just little command line app that can generate a VC++ compatible obj from a data file or something?
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The minute you depend upon a specific linker option to do something like this, your code become platform dependent.
I don't know if there is a command line app does what your asking. If there is and you use it, then you're again, making your code platform dependent.
Here's how I to do it, when I needed to import such data files into my code:
1) Write a small program that takes my data file type and generates a file that contains an array in C/C++ code, that contains the data.
2) Include the generated file in the project.
That's all there is to it. Now the name of the array is a pointer to your imported data.
Good Luck!
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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>The minute you depend upon a specific linker option to do something like this, your code become platform dependent.
Well, compiling and linking is always a platform dependant proccess isn't it? The issue here is the ease in which you can get an app set up to build on different platforms. Right now all I really concerned about is that all my C code is platform independant. If it's a little tricky to build so be it, I'll cross that bridge when I come to it.
>I don't know if there is a command line app does what your asking. If there is and you use it, then you're again, making your code platform dependent.
That depends. If the app I used was also platform independant, then it wouldn't be a problem.
>Here's how I to do it, when I needed to import such data files into my code:
1) Write a small program that takes my data file type and generates a file that contains an array in C/C++ code, that contains the data.
2) Include the generated file in the project.
>That's all there is to it. Now the name of the array is a pointer to your imported data.
A little messy, but not a bad idea. I'll take it into consideration if I can't find a way to do it the way I wanted. I was thinking I might see if there was a way to rig it up with NASM, but of course then I'm becoming CPU dependant. That isn't actually a real problem at the moment, but it could come back to haunt me later. Hmm... am I the only one who thinks that C needs a standard directive for embedding a data file into a compiled program?
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Xzyx987X wrote:
compiling and linking is always a platform dependent process isn't it?
Yes, compiling and linking are alway platform dependent. What I was referring to, was dependents on a particular linker option; which limits you to only linkers that have that option.
Xzyx987X wrote:
That depends. If the app I used was also platform independent, then it wouldn't be a problem.
If the app produces .obj files, then it can't be platform independent. It would have to know the format of every .obj file produce by every compiler out there (not possible).
Xzyx987X wrote:
I'll take it into consideration if I can't find a way to do it the way I wanted.
In the time it took you to receive and reply to my last message, I could have written the require program (and so could you).
Xzyx987X wrote:
Hmm... am I the only one who thinks that C needs a standard directive for embedding a data file into a compiled program?
Probably.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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See if this article helps.
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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I'd rather not do anything that involves hacking up the exe once it's compiled. Talk about a messy build process...
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I'ma C++ newbie, and i'm trying to find a useful occasion where copy constructors can be used. It's quite useless learning the thing and then not knowing when or what to use it for.
MO money, mo problems
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myclass m1 = m2; // implicit call to copy constructor
myclass m1(m2); // explicit call to copy constructor
m1 = m2; // explicit call to operator=
m1(m2); // error if tried here
The compiler will generate a bitwise version of the copy constructor it you do not define your own version. This is ok as long as you class, and its data types, does not contain in allocated data pointers. If they contain data pointers, then you'll have two classes pointing to the data and when one of the class is destoyed the data pointed to is destoyed. What that means, is the data pointer in the class that still exist is now invalid and anything you try to do with it (including freeing it) it will cause problems (probably crash your program). Therefore, you need to create your own copy constructor that allocates memory for its self so you can make a copy of the stored data.
Note what I just said about copy constructors also applies to operator=, except that if you supply a copy constructor and you don't supply an operator=, then the compiler should generate an operator= that uses your copy constructor (instead of a bitwise copy). Therefore, if you supply a copy constructor, you should not need to supply your own operator=.
That should give you a good start at understanding why copy constructors are important. After all, whether you supply your own or the compiler generates one, there is going to be a copy constructor.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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hi everyone..
i have a little problem with UPDATE_COMMAND_UI...it seems to work perfectly in non-dialog based programs but when it comes to dialog-based ones the following are noticed:
1-the OnUpdateFileNew function(which is called by the ON_UPDATE_COMMAND_UI) is not called until my menu item is pressed...it should be called before the item is displayed..
2-the CCmdUI* in the previous function belongs to a weird class called CTestCmdUI which is in wincore.cpp...it should be a pointer to a CCmdUI class in cmdtarg.cpp....
actually i'm new in this update command ui thing so it will be very appreciated to explain more about it to me...
thanx..
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MFC doesn't implement the automatic update of UI elements for dialog based apps.
If you want to have this functionality for a menu in a dialog based application you could do something like the following (it wasn't thoroughly tested and makes use of undocumented functions so, as always, use it at your own risk):
In you dialog class declaration, add the following member:
afx_msg void OnInitMenuPopup(CMenu* pMenu, UINT nIndex, BOOL bSysMenu);
In your dialog's cpp file, make the following changes (change "YourDialog" to the actual class name of your dialog too):
BEGIN_MESSAGE_MAP(YourDialog, CDialog)
ON_WM_INITMENUPOPUP()
END_MESSAGE_MAP()
void AFXAPI AfxCancelModes(HWND hWndRcvr);
void YourDialog::OnInitMenuPopup(CMenu* pMenu, UINT nIndex, BOOL bSysMenu)
{
AfxCancelModes(m_hWnd);
if (bSysMenu)
return;
ENSURE_VALID(pMenu);
CCmdUI state;
state.m_pMenu = pMenu;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pParentMenu == NULL);
HMENU hParentMenu;
if (AfxGetThreadState()->m_hTrackingMenu == pMenu->m_hMenu)
state.m_pParentMenu = pMenu;
else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
CWnd* pParent = GetTopLevelParent();
if (pParent != NULL &&
(hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
{
int nIndexMax = ::GetMenuItemCount(hParentMenu);
for (int nItemIndex = 0; nItemIndex < nIndexMax; nItemIndex++)
{
if (::GetSubMenu(hParentMenu, nItemIndex) == pMenu->m_hMenu)
{
state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
break;
}
}
}
}
state.m_nIndexMax = pMenu->GetMenuItemCount();
for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
state.m_nIndex++)
{
state.m_nID = pMenu->GetMenuItemID(state.m_nIndex);
if (state.m_nID == 0)
continue;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pMenu != NULL);
if (state.m_nID == (UINT)-1)
{
state.m_pSubMenu = pMenu->GetSubMenu(state.m_nIndex);
if (state.m_pSubMenu == NULL ||
(state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 ||
state.m_nID == (UINT)-1)
{
continue;
}
state.DoUpdate(this, FALSE);
}
else
{
state.m_pSubMenu = NULL;
state.DoUpdate(this, state.m_nID < 0xF000);
}
UINT nCount = pMenu->GetMenuItemCount();
if (nCount < state.m_nIndexMax)
{
state.m_nIndex -= (state.m_nIndexMax - nCount);
while (state.m_nIndex < nCount &&
pMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
{
state.m_nIndex++;
}
}
state.m_nIndexMax = nCount;
}
}
Hope that helps, and please let us know if it worked or not.
--
jlr
http://jlamas.blogspot.com/[^]
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Hi everybody. I'm a C++ newbie so if my questions seem to shock the life out all you veterans out there plz forgive me. I"m just having problems trying to understand what on earth a copy constructor does or is used for (assuming that it does have a use in our current existing life!) If someone could just give me a clear example(s) on this, I would appreciate it. I would also like a little explanation on what it might (it at all) be used for. Thanxs (again i apologize if my questions seem to ignorant  )
Respect nerds, chances are you'll be working for one!
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I checked that one out already. Still didn't make sense. Plus somehow my computer's been acting really weired with the online encoding, so im not even sure what i'm looking at is what it's supposed to be (i'm getting extra parenthesis and brackets in unusual locations). Any other suggestions??
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Hi,
I am doing a project on win32 threads. I have created a event inside the thread and looping using while() and waitonsingleobject() until the condition is met.
For some reason I have to use thread. I am calling the thread in WM message but I want to wait there itself(where I called the thread) until the thread is finished. How can I do this???
I tried using a global boolean variable setting that to true when the thread is started and to false when the thread is terminated, and creating another evet to wait until this boolean variable becomes false.But it did'nt work very well.my app started hanging...how can i solve this..
Thanks in advance.
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You message loop should run independent of the thread.
Only if your program is terminating should the message loop ever wait on the thread.
If you supply the window handle into a variable the thread can access, the thread can post a registered window message back into your message handler, which your handler can detect, to know that the thread is done processing. Otherwise, the message handler can go about its regular business and your progrma will not appear to be hung.
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Dear Group,
I am trying to get the source (src) of images in web pages. I am using IHTMLElement2 (IE's API) to get the information regarding the html elements. I successfully extracted images, but i dont know how to extract the src of images.
for example: if you have,
then how would you extract "/intl/en_uk/images/logo.gif" using the IE's API !!
I know i can do that by searching through the html source code, and do a similarity match for the word (src) ... that would be too time consuming
does anyone know an easy better way ???
cheers
llp00na
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