|
Yes, the prefix helps the reader to recognize a member variable, one that isn't declared right there in the function. Other prefixes are g_ for globals (pretty common), and s_ for statics in a function (less common, although I use it). I've also seen one or two people use c_ for controls (such as a CListCtrl in a dialog) but I prefer using m_wnd for those.
--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My really out-of-date homepage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
|
|
|
|
|
I like the c_ for control.
Always I use the first letter in lower case to show the type.
eg int m_iCount, CSize m_zBox, Point m_pDot. etc.
Especially in larger apps I find it makes Life easier with the intellisense stuff.
Regardz
Colin J Davies
Sonork ID 100.9197:Colin
You are the intrepid one, always willing to leap into the fray! A serious character flaw, I might add, but entertaining.
Said byRoger Wright about me.
|
|
|
|
|
|
Thank you.
|
|
|
|
|
|
hello everybody!
I have some trouble in freeing up the memory allocated for dialog items.
I have created the Gui screens using new and I use DestroyScreen to free my memory like this:
<br />
virtual void DestroyScreen(void) <br />
{<br />
if (m_pDlg->GetSafeHwnd())<br />
{<br />
delete m_pDlg;<br />
m_pDlg = NULL;<br />
}<br />
}<br />}
I go through each dlg using this DestroyScreen function.
The returned warning is:
Warning: calling DestroyWindow in CDialog::~CDialog --
OnDestroy or PostNcDestroy in derived class will not be called.
Detected memory leaks!
Dumping objects ->
{3539} client block at 0x0081A330, subtype 0, 332 bytes long.
a CDialog object at $0081A330, 332 bytes long
Could anyone please help me with this one?
Thanks everyone!
Cheers,
wilche
|
|
|
|
|
|
You're destroying the dialog C++ object before the dialog window has been destroyed. Call m_pDlg->DestroyWindow() (assuming these are modeless) and call delete this; in each dialog's PostNCDestroy().
--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My really out-of-date homepage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
|
|
|
|
|
let me guess ur problem:
m_pDlg is a pointer to CDialog or its sub-class, say XDialog.
instances are not from XDialog, but its sub-class.
if my guess is correct, simply change distructor to 'virtual' one. that is all.
for MFC class, it is not necessary to call Destroy, MFC can do it itself.
includeh10
|
|
|
|
|
I'm learning VC++/MFC programming.
I want post data to a webserver by http protocol,but it is errors
Source followed:
CString strHeaders =_T("Content-Type: application/x-www-form-urlencoded");
// URL-encoded form variables -
// name = "John Doe", userid = "hithere", other = "P&Q"
CString strFormData = _T("t=abcd");
CInternetSession session;
CHttpConnection* pConnection =
session.GetHttpConnection(_T("http://127.0.0.1/test.asp"));
CHttpFile* pFile =
pConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST,_T("http://127.0.0.1/test.asp"));
why the pFile is null?
6对9说：好好的，打什么倒立。0对8讲：胖就胖一点了，系什么腰带。7对2讲，别跪了，跪死了也不嫁给你。5对3讲：哼，再隆胸也是假的
|
|
|
|
|
lxdff wrote:
session.GetHttpConnection(_T("http://127.0.0.1/test.asp"));
GetHttpConnection requires a server, not a file. Try
session.GetHttpConnection(_T("127.0.0.1"));
Joel Lucsy (jjlucsy@ameritech.net)
|
|
|
|
|
|
I am very new at C++ programming and know little about it but I have been having complications with my errors stating that I have a undeclared identifier and I have no idea on how to correct this problem for a class assignment. Any information would be helpful.
Confused and lost
|
|
|
|
|
Posting code is a step in the right direction. I think you've mistyped a variable name and so it can't find the variable you're trying to use. For example
int nMyInt = 0;
int nMyOtherInt = nMyInnt * 2;
would generate this error, I believe.
But it's hard to tell without seeing the code and the error message.
Christian
We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )
|
|
|
|
|
Hey coders... I am interested in building a MFC class Library but when I run it asks me:
Please specify the name of the executable to be used for the debug session.
It then offers a drop down. Listing Internet Explorer, Regsvr32.
I choose Regsvr32 because I believe that is the appropriate exe and click ok.
It then gives me a dialog warning saying no .dll was specified.
So I tried going C:\WINDOWS\System32\regsvr32.exe /i then the path of my solution but it still doesn't work.
I am also getting these errors in my output window.
LNK : warning LNK4089: all references to 'OLEAUT32.dll' discarded by /OPT:REF
LNK : warning LNK4089: all references to 'USER32.dll' discarded by /OPT:REF
If anyone could explain to me what I need to do or tell me where I could find a page that explains how to do this it would be greatly appreciated.
Thanks. 
|
|
|
|
|
you can't "run" a library. a library isn't a program; it's just a collection of functions/classes.
it's prompting you for something to run.
if you want to test the functions in your library, write a program that uses those functions/classes and run it.
-c
To explain Donald Knuth's relevance to computing is like explaining Paul's relevance to the Catholic Church. He isn't God, he isn't the Son of God, but he was sent by God to explain God to the masses.
/. #3848917
|
|
|
|
|
Hi,
If I create a dabase table in MS Access 2000, there is a single row with 2 cells:
1) Date (today) 2) Time (present time)
By using Date/Time value and activate Tool Adavance option & Refresh every 1 second (or some thing else) ... will it update these values?
If not, can some one help me to show how to update it (automatically) after trigger it?
I did try but if fail to updated itself!
Thanks,
ATC
|
|
|
|
|
Hi everyone been trying some weird stuff lately, I'm pretty new in the VC++ world....
What I want is to pass the structure name to the function?
This is what my actual code looks like (obviously it doesn't work, yet!)
CSlsuTable* pSLSU = new CSlsuTable(pDatabase); //CSlsuTable is my struct
ASSERT(pSLSU);
if (pSLSU)
if (BadFileTest(pSLSU,"su_key='I_CALC30'","slsu",pDatabase))
BOOL CGridApp::BadFileTest(struct cTableSet , CString strTableKey,CString strTableName,CDatabase* pDb) //I Can't get the struct 
.
.
.
cTableSet* pTable = new cTableSet(pDb);
ASSERT(pTable);
if(pTable)
{
while(TRUE)
{
nret = IDNO;
pTable->m_strFilter.Empty();
pTable->m_strFilter = _T(strTableKey);
strSQL = _T("SELECT ");
strSQL += pTable->m_strDefaultSQL;
Does this make any sense at all? is it possible to do this someway?
|
|
|
|
|
Another thought I had on this ... is there anyway to pass the structure name as a string and then use that to declare my structure within the function? is this possible? Puzzled Emoticon
Ex:
BadFileTest("CSLSUtable","su_key='I_CALC30'","slsu",pDatabase)
BOOL CGridApp::BadFileTest(CString cTableSet , CString strTableKey,CString strTableName,CDatabase* pDb) //I Can't get the struct
.
.
.
cTableSet* pTable = new cTableSet(pDb);
ASSERT(pTable);
|
|
|
|
|
ts74 wrote:
is this possible?
nope. C++ isn't that flexible.
the best you can do is use some kind of mapping from text string to internal structure.
-c
To explain Donald Knuth's relevance to computing is like explaining Paul's relevance to the Catholic Church. He isn't God, he isn't the Son of God, but he was sent by God to explain God to the masses.
/. #3848917
|
|
|
|
|
It doesn't make a lot of sense but firstly,
ts74 wrote:
CSlsuTable* pSLSU = new CSlsuTable(pDatabase); //CSlsuTable is my struct
ASSERT(pSLSU);
if (pSLSU)
if (BadFileTest(pSLSU,"su_key='I_CALC30'","slsu",pDatabase))
pSLSU is a CSlsuTable class but your function defintion uses struct cTableSet. This should be CSlsuTable* not struct cTableSet;
What are you actually trying to achieve, because what you've said and your code don't tally.
Michael 
Time flies like an arrow. Fruit flies like a banana
|
|
|
|
|
It sounds like you want to select the appropriate structure based on your database query. That can easily be done with a virtual base class.
I think you need an Abstract Factory Pattern. Try a google search.
Todd Smith
|
|
|
|
|
I think the exact pattern the guy needs here is a Factory Method, which is similar to, but not the same as, Abstract Factory.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
What I am trying to do is simplify my program, I have a function in which I verify my tables are verified, the problem is that each table has it's own structure. I wanted to setup a new function where I could pass the structure value so I could validate my tables in one simple process instead of going thru this the long way (copy/paste). So I was trying to figure out a way to pass the structure along to a function, so I could play with it in my new verify function, and this is where I ran into problems...
|
|
|
|
|
This is a confusing discussion because I'm not sure that everyone knows what you understand and don't understand here ( you said you're new to VC++, so I don't intend this as an insult. Just trying to get to the core of the trouble ).
If you are having trouble understanding passing by value versus passing by reference, I'd be glad to explain it. It's pretty easy once you see what's going on.
If what you want is the ability to pass a structure (you should be using classes, by the way) that may have different member variables, then you probably need to understand virtual inheritance (which someone else mentioned) which gives you the ability to pass different inherited structures (classes) to the same function assuming they all have the same parent. I can explain this in more detail if you should desire as well.
Let me know and I'll try to help.
-Matt
------------------------------------------
The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
