|
Hi,
I'm writing a small program with a basic text editor incorporated. It is basically a dialog box with a rich edit box and the capability of saving what is written in the rich edit box to a .txt file. Here is the function I am using to save the text (I'm using _no_ MFC, by the way):
[code]
void SaveRichEditText(HWND hWnd, int nIDDlgItem, char* szSaveFile)
{
char szText[100000]="";
GetDlgItemText(hWnd,nIDDlgItem,szText,100000);
HANDLE hFile = CreateFile(szSaveFile,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
DWORD dwW;
WriteFile(hFile,szText,strlen(szText),&dwW,NULL);
CloseHandle(hFile);
}
[/code]
This works fine, and the file is saved with the correct text.
However, as you can easily see from the code, this has a severe restriction: the text that can be saved is limited to 100,000 characters (or any other arbitrary limit I choose for char szText[]).
This is no doubt a very stupid and basic question, but I can't find the answer in my Sams or "C for Dummies" or other books, so please forgive the lack of knowledge of a relative novice:
How do I make it so that the text length is not limited by the char? Is there a way to get the length of the text in the Rich Edit box and then create a string on the fly that is the length of this? I am sure I have seen somewhere a method using mem... commands, but can't find the answer.
Once this is solved, I would then need to create a load command that reads the text from file using ReadFile(), and I will be faced with a similar problem - namely getting the length of the string from the .txt file and creating that string to insert into my rich edit box.
If anyone can tell me how to go about solving these two problems, I would be really grateful - apologies again if this is a really basic question.
Many thanks,
KB
|
|
|
|
|
try this:
void SaveRichEditText(HWND hWnd, int nIDDlgItem, char* szSaveFile)
{
// Counters
uint nCount = 0;
uint nNewCount = 0;
BOOL bRet = FALSE;
char* szText = new char[100000];
// Get the initial count returned
nNewCount = GetDlgItemText(hWnd,nIDDlgItem,szText,100000);
// Keep getting the count until it returns 0
while( nNewCount > 0 )
{
nCount += nNewCount;
nNewCount = GetDlgItemText(hWnd,nIDDlgItem,szText,100000);
}
// If there is nothing to save return or insert code to create the file and return.
if( 0 == nCount )
{
return;
}
// Delete the array.
delete[] szText;
// Create the array the necessary size (nCount + 1(NULL) )
szText = new char[++nCount];
// Get all of the data.
GetDlgItemText(hWnd,nIDDlgItem,szText,nCount);
// Create the file
HANDLE hFile = CreateFile(szSaveFile,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
DWORD dwW;
// Save the data.
bRet = WriteFile(hFile,szText,nCount,&dwW,NULL);
// Close the file
CloseHandle(hFile);
// Check for write error
if( TRUE != bRet )
{
// Handle Error
}
}
Its probably not the cleanest way of doing things, but it is never the less a way. Hope it helps.
|
|
|
|
|
I'll suggest you to use RichEdit messages,
EM_GETTEXTLENGTHEX to get length of text and create bufer. and EM_GETTEXTEX to get text and fill buffer
|
|
|
|
|
Great, thanks for the info, and thanks for the replies to both of you.
In the end I went the EM_GETTEXTLENGTHEX route and used that to create the buffer, though I had problems before realising that I needed to load RichEd20.dll instead of RichEd32.dll, and then, because I was using a dialog-based app, I had to manually change the class name in the .rc file to "RICHEDIT20A" instead of "RICHEDIT" (just in case anyone else encounters this problem).
Thanks again!
KB
|
|
|
|
|
You need to look for TVN_xxx notification messages.
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
|
|
|
|
|
If your checkboxes are images then I think following code can help you
1) go to classwizard -> add the NM_CLICK message function to your treecontrol
<br />
<br />
OnClickSmptree(NMHDR* pNMHDR, LRESULT* pResult) <br />
{<br />
*pResult = 0;<br />
CPoint pt;<br />
::GetCursorPos(&pt); <br />
m_TreeCtrl.ScreenToClient(&pt);<br />
<br />
UINT nFlags;<br />
HTREEITEM hItem = m_TreeCtrl.HitTest(pt,&nFlags);<br />
<br />
if((nFlags &= TVHT_ONITEMSTATEICON))<br />
{<br />
<br />
}<br />
|
|
|
|
|
Can anybody tell me the meaning of: #define WM_GRAPHNOTIFY WM_USER+13.
Here WM_GRAPHNOTIFY is window message used in DirectX. But how this WM_USER + 13 value is set.
Even at one code, I have seen: #define WM_GRAPHNOTIFY WM_APP + 1.
Pls explain what is the purpose of these statements.
|
|
|
|
|
Read this from MSDN help:
Message numbers in the second range (WM_USER through 0x7FFF) can be defined and used by an application to send messages within a private window class. These values cannot be used to define messages that are meaningful throughout an application, because some predefined window classes already define values in this range. For example, predefined control classes such as BUTTON, EDIT, LISTBOX, and COMBOBOX may use these values. Messages in this range should not be sent to other applications unless the applications have been designed to exchange messages and to attach the same meaning to the message numbers.
That should answer your question. You can read further about the other message types on MSDN
|
|
|
|
|
I have CheckBox in TreeControl (from WTL). Please let me know how can i receive Event notification from checkbox when it is selected/unselected. I tried LButtonDOwm and OnClick but it does not work.
For LButtonDOwn i used
NOTIFY_HANDLER(IID_TC, WM_LBUTTONDOWN, OnLButtonDown) but control does not come to this.
For click i am unable to detect on which item was clicked.
NOTIFY_HANDLER(IID_TC, NM_CLICK, OnClick)
Thanks
Shiv
|
|
|
|
|
Hello,
I have a dialog based application and I have added another dialog box to the resources, made a class for it (derivated from CDialog).
I want to pop up one "new type dialog box" from the main window on action A and want it to remain there until I close it on action B. I can only close it from the (X) on the up right corner.  The dialog style is pop up.
//on Action A
CNewtDlg x;
int nRet = x.DoModal();
//on Action B
// I tried 3 things to close the dialog one at each time.
// none of them works 
x.EndDialog(nRet); // 1st try
x.EndDialog(0); // 2nd try
x.CloseNewDialog(); //3rd try
I also made a member function
CNewDialog::CloseNewDialog()
{
this->EndDialog(0);
}
I would be very happy if someone helped me solving this
Thank you
|
|
|
|
|
Call CDialog::OnOK() or CDialog::OnCancel();
Sonork 100.41263:Anthony_Yio
|
|
|
|
|
caykahve wrote:
int nRet = x.DoModal();
Your dialog x is modal. That means your application waits for it to be closed to continue its work.
This way, your application encounters your tries to close the dialog x only after that has already been closed by the user.
You need to make x an non-modal dialog, and close it in the ActionB-handler.
The call to make your dialog non-modal is x.create(), but there is more to it. Please read the chapter in a good book (like the Prosise) and look examples up at CP.
Who is 'General Failure'? And why is he reading my harddisk?!?
|
|
|
|
|
thank you
create , ShowWindow, and DestroyWindow made it work.
|
|
|
|
|
I've been tasked with looking at sorting some CDO code which runs in an NT service. It works fine from a console but when I run it as an NT service it fails when trying to log on to an Exchange 2000 server. The code uses CDO rather than Extended MAPI (which is what I would've used), and I'm tempted to rewrite it in MAPI, but it would potentially take a lot longer than just trying to fix the existing code. I know there were issues with CDO in an NT service for Exchange 4.0 and I've have found various suggestions that CDO from an NT service is definitely not recommended. Can anyone shed some light on this topic? I'm happy to rewrite using MAPI but I may need some sort of justification for the effort required.
Also, does anyone know of anny decent resources other than MSDN for CDO wrt source code, problems, bugs etc.
"The folly of man is that he dreams of what he can never achieve rather than dream of what he can."
"If you think education is expensive, try ignorance."
|
|
|
|
|
The problem, I think, is that your NT service is running under a different account (typically LocalSystem) therefore cannot open the appropriate e-mail connection. What you can do is, reconfigure the NT service to run under the correct user account (the account that owns the e-mail profile, etc.).
You can also write your code as a regular program (not as a service) and start your program with XYNTService[^].
My articles and software tools
|
|
|
|
|
Hi , Ive classic List Control with some header stuff. Now i need to manually select row but i cant find any function such as "SelectItem" or similar or any other solution. Can anyone help me plz ? Thx in advance.
|
|
|
|
|
CListCtrl::GetNextItem(-1, LVNI_SELECTED);
This is for single selection only.
Sonork 100.41263:Anthony_Yio
|
|
|
|
|
ctrl.SetItemState(index, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED);
Roger Allen
Sonork 100.10016
Death come early, death come late,
It takes us all, there is no reason.
For every purpose under heaven,
To each a turn, to each a season.
A time to weep and a time to sigh,
A time to laugh and a time to cry,
A time to be born and a time to die.
Dust to dust and ashes to ashes,
And so I end my song.
|
|
|
|
|
You can use CListCtrl::SetItemState
for example: SetItemState(index, LVIS_SELECTED, LVIS_SELECTED);
|
|
|
|
|
Thank you, guys
|
|
|
|
|
Hi,
I have to bite the bullet and provide a custom container class*
Broken down, here's my question:
Assume a typical array implementation with size/reserve mechanism, or an allocation granularity.
if the vector contains classes is it better to
a) allocate the "additional" elements the normal way, thus calling the default constructor immediately even for the currently unused elements
b) allocate "dumb" memory, and call the constructor explicitely (using placement new) only when an element gets into use.
(a) has lesser complexity, and less pitfalls.
OTOH, (b) is closer to a "simple containter", in that it calls only the constructor of elements that are really used (better encapsulation of the preallocation mechanism), and it might perform better in an reserve-and-append scenario: data can be appended in one pass calling copy constructors, rather than two passes (1st pass default CTor, 2nd pass assignment operator).
Comments? Ideas? Experiences?
*) STL is out for several reasons, and this time it's not because I hate STL
"Vierteile den, der sie Hure schimpft mit einem türkischen Säbel."
sighist | Agile Programming | doxygen
|
|
|
|
|
I have a number of template collection class' and use method (b) ... and method (a).
I have a bit flag(s) in my class that tracks if i'm to call the constructor and/or destructor (along with methods to set these flags of course).
If your container class is specificly for a known containee class then no worries.
If the container is a template class for any containee type (base type or class) then there are a couple things that are a pain :
- you will want to control if the container calls contructor/destructor as mentioned above.
- you can't use #defines or template versions of contructor/destructor (see below).
- ummm, some other stuff ...
// Placement new :
// The #define versions work for all types except when trying to destruct
// a base type (e.g. long).
// The template version work for all types, but can introduce more code.
// The compiler recognizes there is no destructor for base types and inserts
// a no-op function.
// The biggest problem with constructor template is that can not pass
// variable parameter list to constructor.
// Note the #define version has been left so that the parameter list
// can be tacked on.
//
#define CK_CONSTRUCTOR(TT, PTR) new(PTR) TT
#define CK_DESTRUCTOR(TT, PTR) ((TT*)(PTR))->~TT()
template<class tt=""> inline void FkConstructor ( TT *PTR ) { new(PTR) TT(); }
template<class tt=""> inline void FkDestructor ( TT *PTR ) { PTR->~TT(); }
so i end up calling FkConstructor/FkDestructor in my container (you could use CK_CONSTRUCTOR() instead).
...cmk
Save the whales - collect the whole set
|
|
|
|
|
I have developed a mutithreaded FTP application for uploading more than one files simultaneously. I have used MFC's CFTPConnection class for establishing connection and for transferring files. For every file, i have to transfer i connect to the FTP server using GetFTPConnection and then transfer file using PutFile. But after uploading few files CPU usage shoots up to 100%. Can any body tell me the reason for this.Sometimes it does not last long but sometimes it lasts long and the application hangs. Currenltly 5-6 threads are active at a time and other that this there is one more thread running in my application to chck the FTP connection is axctive or not.
|
|
|
|
|
The most likely cause for 100% CPU is that you have a runaway thread that is not correctly waiting, is stuck in an infinite loop, infinite recursion, or something like that which causes it to use all the CPU. Place a few TRACE statements in the threads and one of them will go mad with output - thats your culprit!
|
|
|
|
|
I saw the sample program of how to print out in a formview.
The code is following. Right now I want to print out the image
to fit into paper( if A3 larger image than A4). How to achieve this?
CPoint oldPoint = GetScrollPosition( );
CPoint pt( 0, 0 );//scroll to up
this->ScrollToPosition( pt );
CClientDC dc(this);
CRect rect;
m_dib.Attach( GDIUtil::GrabDIB( &dc, rect ) );
ScrollToPosition( oldPoint );
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
