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Can any one tell me the use of "this pointer" in vc++?
//
if(pWnd == this)
//
In the above code, what is the signifance of the above code ?
Philip
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Hi,
"this pointer" use to point the current object.
if(pWnd == this)<br />
In above code check the current object is pWnd(Window) object.
Regards,
Selvam
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phijophlip wrote:
Can any one tell me the use of "this pointer" in vc++?
See here.
phijophlip wrote:
if(pWnd == this)
//
In the above code, what is the signifance of the above code ?
It is comparing two objects to see if they are equal.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Hi all:
After I run the GrafMenu example in chapter The GDI bitmap object(Programming Windows), I can not achieve the correct result.There's no graphic appearing in menu.
When I debug this example, I found that the function StretchBitmap() return a NULL Bitmap handle! But what causes it?
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I have a dialog with the ID IDD_RESULTSDLG, I derived a class called CResultsDlg from CDialog that calls that dialog. It's a simple dialog, has 8 static text areas and an okay button. I have overloaded the constructor to pass 3 integers and a float. I run it by issuing these commands:
CResultsDlg * myResults;
myResults = new CResultsDlg(offsetWidth, myBitmap->getHeight() * myBitmap->getWidth(), myOutput->getBytesWritten(), compression);
myResults->DoModal();
The constructor takes the arguments and simply sets 4 out of 8 static texts to those numbers.
It compiles fine, but I get a runtime error box:
Debub Assertion Failed!
(path to executable...)
File: dlgcore.cpp
Line: 491
For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application)
I press retry and it brings up another window:
Unhandled exception at 0x7c205d2c (mfc70d.dll) in 489gui.exe: User breakpoint.
I can press continue and it continues running but doesn't show that dialog or I can break it.
It also brings up the file dlgcore.cpp and puts the cursor at dlgcore.cpp, line 491:
ASSERT(m_lpszTemplateName != NULL || m_hDialogTemplate != NULL || m_lpDialogTemplate != NULL);
In debug, when it reaches that line, VS tells me all three are NULL. Did I miss a step when I'm trying to do this? Can I not overload the constructor or am I doing it wrong? I can call the dialog using the default constructor and it comes up without any error. Any help would be greatly appreciated.
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you probably forgot to initialise the CDialog base class in your CResultsDlg class constructor.
Regards,
Serge Krynine
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ah-ha, I must have missed that little detail, good call. I get the dialog fine but the data in the static text isn't being set properly. Here's my constructor code:
CResultsDlg::CResultsDlg(int offsetWidth, int uncompressedSize, int compressedSize, float compressionRatio) : CDialog(CResultsDlg::IDD, NULL)<br />
, offsetWidthInt(0), uncompressedSizeInt(0), compressedSizeInt(0), compressionRatioFloat(0) {<br />
offsetWidthInt = offsetWidth;<br />
uncompressedSizeInt = uncompressedSize;<br />
compressedSizeInt = compressedSize;<br />
compressionRatioFloat = compressionRatio;<br />
UpdateData(FALSE);<br />
}
offsetWidthInt, uncompressedSizeInt and compressedSizeInt are all integer variables that I made to change the appropriate static text, same with the compressionRatioFloat but it's a floating point number of course. I put the UpdateData(FALSE); because I used it when I (tried to) learn(ed) how to do data exchanges between dialogs and thought it might be what I'm missing but that's not it. Anyone know what I'm not doing or not doing right?
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Dialog and controls are not valid until DoModal is called.
Add the OnInitDialog function to your dialog class.
Call the UpdateData(FALSE) from there if you think you must (though you will find it is already called for you).
You need to store the data passed to constructor in member variables, and then tranfer data from member variables into controls in the DataExchange member function - this can be done for you nearly automatically if you use ClassWizard to associate member variables with the static text controls.
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How to decode MPEG video and audio?
Is there any source code?
Thanks!
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what exactly is your need in mpeg layer??
if its mpeg1 layer3 then i could help you in case of audio.
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Hello!
I am a absolute beginner!
I found a source here about HOOK - realized with DLL. I use it in my app to wait for key_down. But I have problem. I want my app to come to the top, when the CALLBACK-procedure has identified a key press. How can I do it easily?
My code in the DLL:
<br />
HWND g_hWndMain;<br />
<br />
LRESULT CALLBACK Keyboard( int code, WPARAM wParam, LPARAM lParam )<br />
{<br />
if (code==HC_ACTION) <br />
{<br />
LPEVENTMSG lpEvent= (LPEVENTMSG)lParam; <br />
if( lpEvent->message == WM_KEYDOWN && LOBYTE(lpEvent->paramL) == VK_F1 )
{<br />
MessageBox( NULL, "CTRL + F1 pressed!", NULL, NULL );<br />
SetForegroundWindow(g_hWndMain);
}<br />
}<br />
return ::CallNextHookEx(g_hHkKeyboard, code, wParam, lParam);<br />
}<br />
<br />
__declspec(dllexport) BOOL IdleTrackerInit(HWND hWnd)<br />
{<br />
if (g_hHkKb == NULL) <br />
{<br />
g_hHkKb= SetWindowsHookEx( WH_KEYBOARD, KeyboardTracker, g_hInstance, 0 );<br />
<br />
}<br />
<br />
<br />
_ASSERT(g_hHkKb); <br />
<br />
if (!g_hHkKb)<br />
{<br />
return FALSE;<br />
}<br />
else <br />
{<br />
g_hWndMain = hWnd;
I don't know if the code line:
SetForegroundWindow(g_hWndMain); // set the main window to the top
is right or wrong!
If it is ok, how can I give the main window to the parameter HWND hWnd ????
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can some please tell me it the HOURS seem right for these estimates for a bejeweled concept game. thank you. game graghics provided by client.
Activity........................................stimated hours........Hourly Fee......Price
Application design...........................................60...........17.1.......1026
Java class BeJeweled and algorithm for playing....160...........13.7.......2192
Graphic images for Jewels and other elements........0............13.7............0
Special sparks effect (dispalyed time intervals).....30............13.7.........411
Special effect on mouse over...........................20..............13.7........274
Special effect on mouse click...........................20...............13.7........274
Special effect on score...................................20...............13.7........274
Special effect on moving pieces........................60...............13.7........822
Special effect on Bonus..................................20...............13.7........274
New Game/Simple/Timed/Mute buttons...............4................13.7........55
Pause game..................................................8................13.7........110
Music.........................................................16................8.2.........131
User help....................................................12................8.2.........98
Testing ......................................................24...............8.2.........197
Installation & instructions...............................12..............8.2...........98
Total price.................................................................................6236
1st Time Buyer Discount.................................................................374
Price after discount......................................................................5862
dee
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Hello
I have a dialog and on this dialog there is a editbox(say m_edit1) and a button. When I enter some text in this editbox(m_edit1) and push the button, I want this action(buttons onclick event) to create a popup window on which there is an editbox(say m_edit2) to be filled with the information(text, string whatever) received from the parent dialog(the info provided thru m_edit1).
What should I do ?
Should I declare m_edit1 public, private or what ?
Should I include first class's header file in the popup window ?
What should I write to pass the m_edit1's text into popup's m_edit2.text ?
Thank you for your help
Nice Özgürce
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Let CPopDlg is PopUp Window for your Dialog class with Dialog Template(IDD_POPUP), make a EditBox on that Popup and Make it Variable Public viz. m_strPopupEdit(type CString);
now onCLick Event of Button on Dialog Box
this->UpdateData();
CPopDlg dlg;
<code>dlg.m_strPopupEdit=this->m_edit1</code>
dlg.Create(IDD_POPUP, this);
dlg.ShowWindow(SW_SHOW);
"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk
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i'm trying to enumerate the same application that appear on the ALT-TAB or on the Applications Tab of the TaskManager.
but as you know the EnumDesktopWindows "give" me more windows than the ones i need.
the problem is that i am having a hard time filtering the windows
does anyone know the way to filter (discard) the windows that i get in order to have only the ones in ALT-TAB?
"There is no sin in making an error - we all do, and that's how we learn. Sin lies in letting stand an error, once we discover it, without correcting it."
Roger Wright
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After You get Handle Of Desktop Window Use Api IsWindowVisible api to determine that Window is Visible on Desktop or NOT.
"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk
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Dear all,
What is the fastest way to locate the focused item in CListCtrl object?
BRs
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GetSelectionMark().
Tom Wright
tawright915@yahoo.com
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Thanks Tom,
While waiting for your replies, I found a solution. That is GetNextItem(-1, LVIS_FOCUSED)
Thanks anyway.
BRs
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Just wandering why the CListCtrl::GetFirstSelectedItemPosition() is not good enough ?
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Because I wanted to find the focused item, not selected item. By using GetNextItem(), I can directly locate the focused item and that's what I needed.
BRs
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hi
Does anyone know how to create html file from a c++ program (MFC)? I am working on a program where i have to generate a report from some database and should be able to print it. so i was thinking of creating report in html file which will be easier to format and print too. but i looked everywhere for some tutorials or any articles... no luck ..
have anyone done something similar? can someone help???
links for tuts or projects anything
thanks
zlich
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The most basic way is to open a text file, write out HTML to it, and close it. If you don't know how to write HTML though, this isn't going to be too easy... but then, neither is anything else i could suggest. Some reporting packages will output to HTML, but if you're using a reporting package then you already have formatting/printing built-in.
Shog9
I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...
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that.s not a very big task,just create the file name by using the .htm or .html extension,n then everything is as simple as creating a html page.for html you could check any site(lots of examples are available).
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