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Hello everyone
I have a window with two scrolls, and I want to get WM_VSCROLL in function "PreTranslateMessage(MSG* pMsg) ". Though I add "case WM_VSCROLL:" to soource code, but I can not get it. Because the message does not come into "PreTranslateMessage(MSG* pMsg)". How to get it?
Thanks.
-Freehawk
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Overide WM_VSCROLL message in your Window
if you are using the MFC
the Function Declaration is like this
OnHScroll(UINT nSBCode,UINT nPos,CScrollBar *pScrollBar)
where pScrollbar contain pointer to that Scrollbar if it is not Window Default Scrollbar.
In Win32
lParam contain the pointer to The Scrollbar you have to typecast that.
-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk
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In fact I want to handle something before WM_VSCROLL happens. I dont know how to catch.
-Freehawk
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Are you using switch case like this
switch(LOWORD(pMsg->message))
or using some other method
-----------------------------
"I Think this Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk
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Normally you write your code inside OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
Should you still want to intercept the WM_SCROLL message, then use the PreTranslateMessage() function of your app class (not the dlg one)
SkyWalker
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Is there any way to get a pointer from CWinApp to CView or generally to access CView public members and methods from within CWinApp?
Thanks.
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i program an MDI text editor, the MFC template consist of a ****Doc derived from CDocument and a ****View derived from CEditView class, but i have problem when save the text i entered, i wanna use the serialize() function in the ****Doc, i've intended to get a pointer to the CEditView and get the chars in CEditView then to save it by ar<
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Hi all:
Just these days I've been bothering by the Windows Mapping Mode a lot. I'm using the Charles Petzold's Programming Windows and when I see the chapter about GDI Mapping Mode I can't really understand what it is all about. Maybe some other materials will help.
Does anyone has any reference material about Mapping Mode?Or give me a little explanation!
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when mdi application run,child window is default miximize size window.
how i can do???
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BOOL maximized;
CMDIChildWnd* child = MDIGetActive(&maximized);
if (child && (maximized || child->IsIconic()))
child->MDIRestore();
Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.
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Dear friends,
I am using std::map. I want to give std::string as a key. But whenever i am giving std::string as a key, compiler starts giving horrible errors. I checked both in VC 6.0 and VC 7.0. Here is the program:
#include <iostream>
#include <map>
using std::string;
int main(int argc, char* argv[])
{
typedef std::map<string, string> DICTIONARY;
DICTIONARY m_dictionary;
std::pair< DICTIONARY::iterator, bool > result;
result = m_dictionary.insert(DICTIONARY::value_type("Sincere", "Honest"));
return 0;
}
One of the errors i am getting is:
(139): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string'
Imtiaz
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You forgot to add the following:
#include <string> After adding this #include, you still will get many C4786 warnings: these warnings are entirely harmless and can be supressed with
#pragma warning(disable:4786) // add this to the very beginning of your program These two changes will get you a clean compile. Best,
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!
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hi all,
I connected with SQL Sever database using C++.I have used ODBC Connection.I added a class which based class is CRecordset..
The problem is when I open the Application it always displaying the "SQL Server Login" Dialog and ask the username and password.
How do I stop appearing that Login Dialog when I openning it?
please any one know this.please help me..
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use CDatabase::noOdbcDialog as the second parameter in OpenEx() method.
Eg; extern CDatabase oDb;
extern CString csConnection;
oDb.OpenEx(csConnection, CDatabase::noOdbcDialog );
this will suppress the login dialog.
Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.
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pero aqui, hablamos ingles...
so speak english with use, or stay into you grupo
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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Hi guys, Im working on an old-skool project which should be game in 0x13 Dos resolution which was 320 x 200, 256 colours, paletized. Can anyone tell me how it is possible to use this mode in windows (in VC++)?
Initializing was done easily and probably will be no problem, but drawing in this mode was done through direct memory access to 0xA000:0000 which will windows probably block in win app.
Or, is there any other way how to use paletized colour mode like this ? thanks
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Bad news sorry,
most of the memory blocks and DOS interrupt tricks that old school 13h and modex programs used won't work under windows. However it is possible to still use the same techniques. If you allocate a framebuffer (similar to a double buffer), you should be able to then use SDL, DirectX or OpenGL to draw a textured quad to a full screen application.
On the other hand it may be just as easy to look at OpenGL, DirectX or SDL directly - they make everything so much simpler, and although they take a while to learn it's nothing too hard and there are plenty of websites offering assistance.
Most video cards still support these resolutions.
If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts your aim;
Yours is the Earth and everything that's in it.
Rudyard Kipling
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I have 2 files with information that I want to merge
Would read a file, parse the info into temporary memory, and then compare be faster than keep the file open and compare parse as it goes without creating large temporary memory to store the info temporary(this way I don't have spend time to clear the memory afterward)?
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Well, if you intend to compare two big files then it is very clear that you should do it by allocating them in the RAM bu if the files are small there is no need
gabby
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1) Can anybody give me an example of why they ever made a member mutable? I know what mutable is but couldn't give a real life reason for using one (I am not one for finding a problem to meet a solution!).
2) const_cast - allows you to, for example, remove the constness from a pointer, but if that pointer points to a const item, you can't change the value of the item. So all you can do is change what the pointer is pointing to. Same question as above - can anybody tell my why they have ever const_casted a const pointer and pointed it elsewhere!?!
(Yep - both interview questions....)
Regards
Angel
*********************************************
The sooner you fall behind, the longer you have to catch up.
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1) I've used mutables in one instance, for capturing statistical data in a test class...
<br />
void MyTestClass::PerformTest() const<br />
{<br />
<br />
if (Test was successful)<br />
_successes++;<br />
else<br />
_failures++;<br />
}<br />
I also found an example in a book (Effective C++) of a String class that caches the string length each time the length member function is called using mutables:
<br />
.h<br />
--<br />
<br />
mutable bool lengthIsValid;<br />
mutable size_t dataLength;<br />
<br />
.cpp<br />
----<br />
<br />
size_t String::length() const<br />
{<br />
if (!lengthIsValid) {<br />
dataLength = strlen(data);
lengthIsValid = true;
}<br />
return dataLength;<br />
}<br />
2) The only time I've ever had to use const_cast (not a pointer to const data though), is when I came across a 3rd party issue...
void MyClass::DoSomething(LPCTSTR lpszData)
{
Win32ApiCall(const_cast<LPTSTR>(lpszData));
}
The Win32 call wanted a LPTSTR, even though the string wasn't changed by the function. I don't know what you'd call it - the dreaded 3rd party design flaw?
 Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!
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Angel1058 wrote:
1) Can anybody give me an example of why they ever made a member mutable? I know what mutable is but couldn't give a real life reason for using one (I am not one for finding a problem to meet a solution!).
In general this occurs when a const object (object A) needs to call a non-const method of the mutable member variable (object B), specifically in a way that doesn't change the const-ness of the object A (did you get all that?  ). Generally this occurs if pretty ugly situations - one example is: http://www.boost.org/doc/html/threads/faq.html#id635597[^]
From what I can remember reference counts are another example of this, the reference count still needs to be modified, even if the object is a const copy.
Angel1058 wrote:
2) const_cast - allows you to, for example, remove the constness from a pointer, but if that pointer points to a const item, you can't change the value of the item. So all you can do is change what the pointer is pointing to. Same question as above - can anybody tell my why they have ever const_casted a const pointer and pointed it elsewhere!?!
I can't think of a good example, but I would imagine something like the conversion of the pointer to something that allows read-only iteration through an array might be a possible answer.
If someone has gone to the effort of enforcing all that const-ness I'd think three times before performing the cast. In general const_cast should be avoided in the real world.
If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts your aim;
Yours is the Earth and everything that's in it.
Rudyard Kipling
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1: I was creating a LRU (least reciently used) cache. in pseudo code it was something like this (more complex, I left out some details):
classe my_cache {
public:
my_cache();
~my_cache();
bool write(int position,void *data);
bool read(int position,void *data);
protected:
void *data;
some_data_struct data_order mutable;
}
Because it is a LRU cache, read needs to update data_order everytime it is called to indicate that some data was used reciently. Otherwise write (from something non-const that points to this same class) might overwrite data that has been used reciently. Note that updating data_order does not change the external behavior of the class, to the user it is still const, as nothing was destroyed.
Unfortunatly the real world intruded when I tried to do that: I discovered my compiler doesn't support mutable. (it is nearly 10 years old, but there is good reason we have to use it)
I've never seen a need for 2, though I suppose it might exist.
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I'm writing ExcelAutomation with VC ++.
I'm having problem to print out the sheets coz there are some sheets that were hidden.
Not a regular hidden.. but very hidden.
I double click on the file to open ( without using program), go to Format->Sheet-> hidden,unhidden.. and every options over there are in gray and diable to click.
So I cant' do it programmatically either to unhide or delete those very hidden sheets.
My question is how can I print the rest of the sheets?
This how I print.
<br />
VARIANT tv;<br />
VARIANT tv1;<br />
VARIANT tv2;<br />
VARIANT tv3;<br />
VARIANT tv4;<br />
VARIANT tv5;<br />
VARIANT tv6;<br />
VARIANT tv7;<br />
<br />
tv3.vt = VT_BOOL;<br />
tv3.iVal = false;
tv4.vt = VT_BSTR;<br />
tv4.bstrVal = printerName.AllocSysString();
tv5.vt = VT_BOOL; <br />
tv5.iVal = false;
tv6.vt = VT_BOOL;<br />
tv6.iVal = true;
tv7.vt = VT_BSTR;
tv7.bstrVal = CString("").AllocSysString();<br />
tv.vt = VT_I4;<br />
tv.lVal = 1;
<br />
sheets.PrintOut(covOptional, covOptional, covOptional, tv3, tv4, tv5, tv6, tv7 );<br />
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