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- In MSDN (Ti: NONCLIENTMETRICS), first paragraph, it is said "The NONCLIENTMETRICS structure contains the scalable metrics associated with the nonclient area of a nonminimized window. "
- I do not know what means "scalable metrics" here.
- Can you show me an example?
- Regards,
Maer
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Here is my problem! I have three classes set up sort of like this:
class MainClass
{
CSocketClass * pSock; // instance of my socket class.
}
class CSocketClass
{
CSocketAddr * pObj;
};
class CSocketAddr
{
operator LPSOCKADDR()
{
return ( LPSOCKADDR )( LPSOCKADDR_IN )this;
}
}
When I call my MainObject->pSock->bind() [which uses my LPSOCKADDR override] and try to do some binding, the pointer this does not refer to the class I called it from, it points back to my main object! That is bunk! When I say "this" I want the class I am calling in. Is it just me?
Peace.
----
Xian
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What does you bind function look like?
Todd Smith
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void XSocket::bindAddress()
{
if( ::bind( m_hSocket, ( LPSOCKADDR )m_pAddress, sizeof( SOCKADDR ) ) == SOCKET_ERROR )
throw "bindAddress";
}
Well, not anymore...
I got around this by not overloading operators and calling member funcs explicitly. It still p1ss3s me off though! I think the "this" pointer within a class should reference the class it is within.
Peace.
----
Xian
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I've Created a Internet Explorer Bar using vc 6.0.My project can run smoothly in Windows 2000,But in Windows Me,When I close IE,It will popup a error message which said "Iexplore have unknown error,will closed".
In my project,I use a MFC regular dll writed by myself,this dll has been tested ok.
Who can tell me what's the possible mistakes in my project?
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The first one would be using Windows2000 api methods not available in Windows ME.
Cheers,
-Erik
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
My thoughts are my own and reflect on no other.
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Hi all!
I made a dialog base application and wanted to use a class I wrote before. I copied the header file and the implementation file to the project folder and use "add files to project" option to add these 2 files. These 2 files are actually working files. However, when I tried to recompile the project, it kept giving me this error.
------Configuration: MyProject - Win32 Release----------
Compiling...
controllerList.cpp
D:\MyProject\MyPoint.cpp(188) : fatal error C1010: unexpected end of file while looking for precompiled header directive
Error executing cl.exe.
Does any one know what is wrong here?
Thank You
Vu
The class is very simple. If you need to have a look, here it is:
//---------------------
myPoint.h
//---------------------
#ifndef MYPOINT_H
#define MYPOINT_H
class MyPoint
{
private:
int x,y;
public:
MyPoint();
~MyPoint();
void setPoint(int,int);
int getX();
int getY();
};
#endif
//---------------------
myPoint.cpp
//---------------------
#include "MyPoint.h"
MyPoint::MyPoint()
{
x= 0;
y=0;
}
MyPoint::~MyPoint()
{
x=-1;
y=-1;
}
int MyPoint::getX()
{
return x;
}
int MyPoint::getY()
{
return y;
}
void MyPoint::setPoint(int x1,int y1)
{
x= x1;
y = y1;
}
vucsuf
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Add #include "stdafx.h" to the top of your file
Nish
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Vu
You have to either turn off use of precompiled headers or enable your class to use precompiled headers.
To turn off Precompiled Headers got to the menu. Select Project -> Settings..., select the C/C++ tab. Select Precompiled Headers from the dropdown combobox. Here you select Not using precompiled headers.
To enable your class to use Precompiled Headers add
#include "stdafx.h"
to the top off you classes header file before all other #include statements.
Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018
"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone
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Just do a Rebuild all after having added StdAFX.h
A vast majority of our imports comes from outside the country.
George W. Bush
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I have a bitmap that I get from a third party decompressor of a video stream. The bitmap comes out at a resolution of 720*243 and 24-bits. I would to like to shrink it down and copy it to an offscreen bitmap that is 320*240 and 24-bits in order to speed up my motion detection algorithm and then blit that image to a screen without using the original image and StretchDIBits().
I believe I would want to create a CompatibleDC and a compatible bitmap to go with it then do a StretchDIBits to that CompatibleDC.
Am I right in this assumption and does anyone have some example code of how that is done?
Thanks,
Clint
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You can also use CopyImage API function to resize the bitmap.
Deepak Khajuria
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I think this is what I am looking for but what does it mean when it refers to the handle of the image. Would it be something like a HBITMAP?
Cheers,
Clint
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You can pass HBITMAP in handle(First Parameter) of CopyImage.
Deepak Khajuria
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Hi,
I am trying to draw a grid onto a CView.
The grid doesn't fit into the far right and lower bottom regions correctly. My suspicion is its some strange effect with rounding. It creates a strange effect when you look at the result after resizing the view.
Anyway it's only a small fragment of code, and i would be very grateful if someone would give it a whirl and give their diagnosis.
void CTestView::OnPaint()
{
CPaintDC dc(this); // device context for painting
CRect ScreenDimensions;
GetClientRect(ScreenDimensions);
POINT line[2]; //Array Of Points, Start And End Of Line
//Draw The Columns
for (int col=0; col <=50; col++)
{
line[0].x = ScreenDimensions.Width() / m_cols * col;
line[0].y = 0;
line[1].x = ScreenDimensions.Width() / m_cols * col;
line[1].y = ScreenDimensions.Height();
dc.Polyline(line,2);
}
//Draw The Rows
for (int row=0; row <=50; row++)
{
line[0].x = 0;
line[0].y = ScreenDimensions.Height() / 50 * row;
line[1].x = ScreenDimensions.Width() ;
line[1].y = ScreenDimensions.Height() / 50 * row;
dc.Polyline(line,2);
}
}
Cheers
Richard Jackson
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To help with rounding errors, always multiply first, then divide.
The following works for me.
int m_cols = 42;
CPaintDC dc(this);
CRect ScreenDimensions;
GetClientRect(ScreenDimensions);
POINT line[2];
for (int col=0; col <= 50; col++)
{
line[0].x = ScreenDimensions.Width() * col / m_cols;
line[0].y = 0;
line[1].x = ScreenDimensions.Width() * col / m_cols;
line[1].y = ScreenDimensions.Height();
dc.Polyline(line,2);
}
for (int row=0; row <=50; row++)
{
line[0].x = 0;
line[0].y = ScreenDimensions.Height() * row / 50;
line[1].x = ScreenDimensions.Width() ;
line[1].y = ScreenDimensions.Height() * row / 50;
dc.Polyline(line,2);
}
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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I am currently writing an app that does not support doc/view. I want to be able to section of the FrameWnd into different views. I am able to split the windows fine at compile time. I want to be able to split the windows while the app is running. I tried to use the dynamic splitwindow but I had trouble because I am not using documents.
Does anyone have a sample of code that does this without using doc/view?
Or does anyone have any ideas?
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(1) Add a CSplitterWnd to your CMainFrame class say m_split.
(2) Derive two view classes [say you have CMyTree and CMyList which are classes derived from CTreeView and CListView]
(3) m_split.CreateStatic(this,1,2);
(4) m_split.CreateView(0,0,RUNTIME_CLASS(CMyTree),CSize (150,100), NULL);
m_split.CreateView(0,0,RUNTIME_CLASS(CMyList),CSize (150,100), NULL);
Hope this helps
Nish
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Thanks for replying,
This is what I had done for the original split window....
if(!m_ospltWindow.CreateStatic(this,1,2))
return false;
if(!m_ospltWindow.CreateView(0,1,RUNTIME_CLASS(CGraphView),CSize(200,200),pContext) )
return false;
if(!m_ospltWindow.CreateView(0,0,RUNTIME_CLASS(CChildView),CSize(200,200),pContext) )
return false;
I tried doing what you said for splitting one of the above splits but it didnt work. I have a menu option that when selected I want one ov the above splits to split again...know what I mean...
So in my OnSplitAgain function I had....
m_ospltWindow1.CreateStatic(m_ospltWindow,1,2);
m_ospltWindow1.CreateView(0,1,RUNTIME_CLASS(CGraphView),CSize(200,200),NULL);
m_ospltWindow1.CreateView(0,0,RUNTIME_CLASS(CChildView),CSize(200,200),NULL);
but it didnt work.... 
Jeremy
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Hi,
I have a slight problem copying a class whose pointer I have. I have an abstract base class, and several derived classes, and a pointer pointing to one of the derived classes, but the pointer is of BaseClass* type. I want to copy the derived. Can I do it using the copy constructor?
Here's a little code
class CBaseClass
{
protected:
CBaseClass();
CBaseClass(CBaseClass &src) {.... foo ....};
}
class CDerivedClass : public CBaseClass
{
public:
CDerivedClass();
CDerivedClass(CDerivedClass &src) {.... foo ....};
}
In the example how could I do this
CBaseClass *destination;
CBaseClass *source = new CDerivedClass();
.... how can I copy the "source" to "destination", and I don't mean a binary copy - there must be a proper C++ way of doing it.
With time we live, with money we spend!
Joel Holdsworth
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Hmmm, what you're asking for is the equivalent of a virtual copy constructor, which C++ doesn't have. I'm not sure how common your scenario is, but I personally haven't run into it, as far as I can remember...
Anyway, you have one of two options:
1. Create a virtual "Clone" function in your base class and override it in your derived classes.
2. Find the type of the object to which the pointer points and create a new object of that type using the copy constructor. For example, you the code you give, you know that source points to a CDerivedClass object. You can then do this:
CBaseClass* destination = new CDerivedClass(*(CDerivedClass*)source);
I'd go with option 1; it's cleaner and safer.
Regards,
Alvaro
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Is destination initialized to anything or do you just want to point destination at the same data source is pointing at? If the later then it's just
<br />
destination = source;<br />
or did you mean
<br />
CDerivedClass *destination;<br />
CBaseClass *source = new CDerivedClass();<br />
in which case it's
<br />
destination = dynamic_cast<CDerivedClass*>(source);<br />
could you provide more info on what you want to do? How are destination and source being used?
Todd Smith
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Hi,
I have an ActiveX control on top of a CFormView and I'm trying to use tooltips in my application. It appears that when the OnToolTipNeedText() method is called, it get's called once for the ActiveX control and once for the CFormView. I'm pretty sure of this because I get two tooltips in my application, one below the mouse and the other at the bottom of the window.
Does anyone know how I can tell if the message is coming from the ActiveX control or the CFormView? I tried looking at the pNMHDR->hwndFrom and compared it to myCtrl->m_hWnd but it is never equal, in fact, it never equals the CFormView->m_hWnd either. I basically just need to concern myself with the message from the ActiveX control and ignore all other messages.
Thanks for any help you can provide,
Craig
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I am building a rather simple dialog program that receives input, however, I am having trouble linking this generated output to be transmitted in email form through outlook explorer. I am still pretty much a beginner programer in C++, so any help would be appreciated.
Thanks
B-rock
B-Rock
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I'm getting very frustrated with trying to send email from my computer programmatically. From what I've been able to find out, there are two choices:
- use MAPI:
problem: It pops up dialog boxes requiring user input when it is unable to send messages or when various errors happen. Therefore it is not useful to me since I want to run the program on a computer that isn't being looked at by a human.
- use SMTP:
problem: You need a computer that you can connect to on port 25 and say HELO\r\nMail From: a@b.c\r\nRCPT To: x@y.z\r\ndata\r\nfirstline\r\nlastline\r\n.\r\nQUIT\r\n or whatever. In any case I don't have a computer that I can send this through so I can't do this either.
But check out the code below for an example of doing MAPI. You have to put a line of code each of mapi init and uninit and include mapi.h. The functions i call at the end here just display the appropriate error message according to a switch statement using strings taken from the msdn docs. hope it helps.
/*
CMfcserverDlg::Mail(CString subject, CString text) {
LPMAPISENDMAIL lpfnMAPISendMail = (LPMAPISENDMAIL) GetProcAddress (m_mapiModule,"MAPISendMail");
LPMAPILOGON lpfnMAPILogon = (LPMAPILOGON) GetProcAddress (m_mapiModule,"MAPILogon");
LPMAPILOGOFF lpfnMAPILogoff = (LPMAPILOGOFF) GetProcAddress (m_mapiModule,"MAPILogoff");
LHANDLE lhSession = 0;
char subject[] = "this is the subject";
char message_text[] = "automated\r\nhello\r\nthis is the message text\r\nblah\r\nblah\r\nblah\r\ngoodbye";
char str_originator_name[] = "alexander the originator";
char str_recip_name[] = "alexander the recipient";
char str_originator_address[] = "snowman@north.pole";
char str_recip_address[] = "SMTP:agriffing@hotmail.com";
MapiRecipDesc originator;
originator.ulReserved = 0;
originator.ulRecipClass = MAPI_ORIG;
originator.lpszName = str_originator_name;
originator.lpszAddress = str_originator_address;
originator.ulEIDSize = 0;
originator.lpEntryID = 0;
MapiRecipDesc recip;
recip.ulReserved = 0;
recip.ulRecipClass = MAPI_TO;
recip.lpszName = str_recip_name;
recip.lpszAddress = str_recip_address;
recip.ulEIDSize = 0;
recip.lpEntryID = 0;
MapiMessage msg;
msg.ulReserved = 0;
msg.lpszSubject = subject;
msg.lpszNoteText = message_text;
msg.lpszDateReceived = 0;
msg.lpszConversationID = 0;
msg.flFlags = 0;
msg.lpOriginator = &originator;
msg.nRecipCount = 1;
msg.lpRecips = &recip;
msg.nFileCount = 0;
msg.lpFiles = 0;
ULONG ret;
ret = lpfnMAPILogon(0, 0, 0, 0, 0, &lhSession);
if (ret != SUCCESS_SUCCESS) {
HandleMAPILogonError(ret);
} else {
ret = lpfnMAPISendMail(lhSession, 0, &msg, 0, 0);
if (ret != SUCCESS_SUCCESS) {
HandleMAPIError(ret);
}
}
lpfnMAPILogoff(lhSession, 0, 0, 0);
}
*/
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