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for example, you have different objects derived from the same base class, you want to add instances of each of them in a list ( STL ), and your list is of the base class type; when deleting object on the list, you can delete them and the virtual destructor of each derived classes will be called.
( or something to that effect )
Maximilien Lincourt
Your Head A Splode - Strong Bad
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I have two questions. First off, is there some control or typical method for displaying hypertext in a visual c++ dialog based program. IE I want blue text with a url behind it that pops up the web browser when the user clicks on it.
Second, is there a way to call a method that does the click without the user having to click on the text. IE If they select a menu item labelled "visit online instructions", what would be the code to call the web browser and automatically link to www.someinstructions.com?
Thank you!
-----------------
http://www.zachcalvert.com
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I want to know whether my program can obtain the message that system time is changed
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Yes is can.
*cough*
WM_TIMECHANGE
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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I am a macintosh programmer. I have many years of experience with C/C++. I need to port a plugin from the mac to the PC. I have an application that allows the user to design a custom dialog. This is not a general purpose dialog editor. When the user if finished, the application generates the resources for defining the dialog and combines that with the plugin code. The application is already running on windows. So what I need to do now is port the plugin to windows. It seems that a dll would be the right thing. So my first question is what should I use to write the plugin/dll (MFC, ATL, ??). The second is how do I embed the resources in the dll. If I can create all the dialog items programmatically then I could create my one data for describing the dialog items. If there is documentation for how to embed the resource and what the format is for each dialog item type then that would be acceptable as that is what I'm doing on the mac side now. I also need to embed some custom binary data. Not knowing windows programming I'm concerned that I might start down a path that will lead to a dead end.
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what is this and how can i use it
Int 21h Function 440Dh Minor Code 41h (FAT32)
Writes data from a buffer to a track on the specified device.
mov bx, Drive ;See below
mov ch, DeviceCat ;See below
mov cl, 41h ;Write Track on Logical Drive
mov dx, seg WriteBlock ;See below
mov ds, dx
mov dx, offset WriteBlock ;ds:dx points to RWBLOCK structure
mov ax, 440Dh ;IOCTL for block device
int 21h
jc error_handler ;carry set means error
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while programming dos, we have to program interrupts. These interrupts are like 10h, 13h, 21h etc, each made for a pre-specified purpose.
21h is called a DOS interrupt. This is a general-purpose interrupt. I guess I can't tell you the whole thing here or perhaps you will not be able to catch up with these things. You need to learn a little bit of System Programming in DOS and Assembly to exactly grab these.
Well, any way, I should continue. Every interrupt is/can be called with a major and minor code. This is like passing arguments to a function. And every major and minor code is for something specific. In this case, I guess major code of 440DH is telling DOS to communicate with the Disk and Minor Code must also be something specific. Now, you will have to check yourself what these codes do and how are these being handled in the next assembly statements.
Think Negatively, It makes you creative 
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What I am trying to make is a Sidekick translator.
As soon as a user launches it, it minimizes to taskbar.
When mouse is hovering on top of a word, it should pop up a tip-window with its corresponding explanation found in the database.
I've successfully hooked up Notepad.exe and had the following API functions replaced:
TextOutA, ExtTextOut, DrawTextA, DrawTextEx.
But none of them seems to be what Notepad uses to display text.
Could someone be of help?
Thanks a lot.
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Notepad is actually a standard, multi-line editbox...
mrviceroy wrote:
I've successfully hooked up Notepad.exe and had the following API functions replaced:
TextOutA, ExtTextOut, DrawTextA, DrawTextEx
How?!
Bikram Singh
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bikram singh wrote:
How?!
Search for API hooks here at CP (or just hooks i'm not sure)
There is an article that explains all sorts of hooking techniques.
How do I print my voice mail?
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Visual C++ Developer's journal had an article on how to do this,
it was published by Fawcette pub, you should still be able to find it.
-Steven Hicks
CPACodeProjectAddict
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Could you give me the time or url, please?
Thank you.
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Hi All,
I have one application running on Windows 2000 server.
It's multithreaded app usingg lot of synchronization objects,STL library , and LDAP stuff. It's crashing after sometime when I enable hyperthreading.
I'm not able to find the reason of actual crash.
Is anyone aware of this issue ?
thanks
Ben
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maybe you have some receconditions, and with HT enabled, they occur faster. you must test a multithreaded app on a multi-CPU computer.
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I did test on multiprocessor system(Intel Xeon) and same issue. Hyperthreading is actually virtual two processor.
Is there any tool to check the race condtitions ?
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Tools might exist you help, but you do not want to use them. You need to examine the code and prove that there are no race conditions. A tool might help you find the particular one that is hitting you this time, but gives no assurance that there are not 1000 more someplace, just waiting for machines to become faster, more loaded, or get more CPUs. Basicly you have no assurance that your program will work on a 32 processor machine with these tools. (Unless you can afford one, and even then test enough that the 1 in a million situation happens)
By prove I don't mean a full mathamatical proof, though that would work. However you need to read all the code looking for pointers passed across threads, and then make sure you are handling access correctly.
Good luck, but I know of no substitute for a lot of hard boring work.
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I downloaded the QuickWin example and opened the .sln file with "MS Visual C++ .net 2003". It asked to convertthe files, which I did. It compiled with the following error:
QuickWin.cpp(195) : error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CQuickWinApp::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'
I had a buddy try it under VC++ 6 and he had no problems.
Does anyone have any ideas or pointers.
Thanks
DCrawford999
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With VC7 user defined message handlers have to return an LRESULT, they can no longer be void functions. VC6 allowed void functions.
ON_MESSAGE (WM_MYMESSAGE, OnMyMessage)
void CMyApp::OnMyMessage(WPARAM wp, LPARAM lp)
{
}
LRESULT CMyApp::OnMyMessage(WPARAM wp, LPARAM lp)
{
return 0;
}
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
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The void is coming from afxmsg.h dealing ON_REGISTERED_THREAD_MESSAGE but I am not sure how too clear up the conflict.
ON_REGISTERED_THREAD_MESSAGE(WM_STDIO_COMMAND, OnStdioCommand)
// for Thread messages
#define ON_THREAD_MESSAGE(message, memberFxn) \
{ message, 0, 0, 0, AfxSig_vwl, \
(AFX_PMSG)(AFX_PMSGT) \
(static_cast< void (AFX_MSG_CALL CWinThread::*)(WPARAM, LPARAM) > \
(memberFxn)) }
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Read the first 200 lines of AfxSig_.h. It explains a lot of how the naming convention of functions work.
AfxSig_vwl = AfxSig_v_w_l,
means your OnStdioCommand prototype has to be
void CMyWinThread::OnStdioCommand(UINT uInt, LPARAM lParam)
I hope this helps.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
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If I change it to a VOID and remove the return, I get:
QuickWin.cpp(196) : error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CQuickWinApp::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'
None of the functions with this name in scope match the target type
DCrawford999
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