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tal1111 wrote: how do I find the target window which the the message (WM_KEYDOWN) is being sent to?
I haven't tested this, but I would guess ::GetFocus() will give you the target window.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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Hello everyone,
I am new to asynchronous I/O. Could anyone recommend some tutorials for beginners, especially how to handle asynchornous I/O with network input/output.
The set of APIs I want to learn is like CreateIoCompletionPort, GetQueuedCompletionStatus, etc. I can not find related samples from MSDN, so I am wondering if you have any recommended articles. 
thanks in advance,
George
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Thanks Hamid,
I looked through this article, it is not covering Window Server 2003, but I am using Windows Server 2003.
regards,
George
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Perfect, Mark!
regards,
George
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From a standard win32 app, or from an MFC app, how can I execute a command line program and capture its output to a buffer? In my particular case, I want to run perforce's command line tool. e.g.: "p4 dirs //depot/subdir/*".
Any recommendations?
modified on Sunday, January 20, 2008 3:48:23 PM
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If your program writes to console and you want to get that output in buffer
create a bat file similar to this
p4 dirs //depot/subdir/ > C:\sample.txt
instead p4 now spwan the bat file.
after your program is executed you can find all data written in sample.txt
to spwan other apps you can use ShellExecute or CreateProcess functions.
Thanks,
Sandip.
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hi,
i have across a problem that is my program will warn me when executing for the code below
recv_server_thread=AfxBeginThread(recv_server, this);
UINT CTest2Dlg::recv_server(LPVOID param)
{
CTest2Dlg* pp=(CTest2Dlg*)param;
...
pp->m_string_peer="Number of Peers: "+Display_integer;
pp->UpdateData(FALSE);
the program can successfully be compiled,
but when it executes to that position,
it pops a windows "Microsoft Visual C++ Debug Library",
saying "Debug Assertion Failer!,
program: <my prgram..skip="">
File: wincore.cpp
Line: 895 ..."
but if i click skip,
the program can continue to run and update the string correctly.
SO is there any problem i have made?
AND using what program code instead of that I using can solve the problem?
Thank you very much~
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drfankw wrote: AND using what program code instead of that I using can solve the problem?
The correct approach, IMHO, is posting a message to the main dialog, asking the latter to call UpdateData.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Short answer:
MFC does not work from multiple threads.
Longer:
The HWND -> CWnd mapping is on a per-thread basis, and you have to be VERY careful. I normally use class Win32 stuff in threads, and save MFC for the main thread only.
But you should be very careful when using multiple threads anyway.
Iain.
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Dear all
the following is what i created 10 arrays, how to save these 10 arrays in a file using ofstream? i would like to name each array as 0,1,2,3,..9..late when i wanna use them, i can take it directly. another quession is why here setw(3) is not available? thanks.
#include <iostream>
using std::cout;
using std::endl;
#include <iomanip>
using std::ios;
using std::setw;
using std::fixed;
using std::showpoint;
using std::setprecision;
int main ()
{
double a[3][4];
for (int j = 0; j <10; j++)
{
double a[3][4] = {{(double)rand()/RAND_MAX, (double)rand()/RAND_MAX, (double)rand()/RAND_MAX,( double)rand()/RAND_MAX},{(double)rand()/RAND_MAX,(double)rand()/RAND_MAX,(double)rand()/RAND_MAX,(double)rand()/RAND_MAX},{(double)rand()/RAND_MAX,(double)rand()/RAND_MAX,(double)rand()/RAND_MAX,(double)rand()/RAND_MAX}};
cout<< setw(3)<< "Particle" << setw(3) << j << endl << endl;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 4; j++)
cout <<setw(3)<< setprecision(6) << fixed << showpoint << a[i][j] << " ";
cout << endl;
}
cout<< endl;
}
}
Li Zhiyuan
5/10/2006
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What is your problem with ofstream?
As a kick-off hint I suggest you to store your array element values in binary form.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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i would like to use each array of a[3][4] as named for example arry[10],if one condition is right, i will use arry[0]= a[3][4];if another condition is right, i use arry[1] = a[3][4],ihave 10 different arrays.. and so on....because i already got 10 3x4 arrays,....in previous ....
by the way, how to use ofstream to create 10 random arrays? thanks
Li Zhiyuan
5/10/2006
modified on Sunday, January 20, 2008 8:03:11 AM
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li zhiyuan wrote: i would like to use each array of a[3][4] as named for example arry[10],if one condition is right, i will use arry[0]= a[3][4];if another condition is right, i use arry[1] = a[3][4],ihave 10 different arrays.. and so on....because i already got 10 3x4 arrays,....in previous ....
A bit confused. Please explain the requiremnt more clearly.
li zhiyuan wrote: by the way, how to use ofstream to create 10 random arrays? thanks
I guess do you mean serialization, i.e. that you need to store the array content to disk and, later, retrieve the values and build again the array. Aren't you able to perform such task? Why?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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yes, you are right, i just want to build 10 arrays using ofstream, in my whole program, i need to use it and one of friends suggested me i can create such 10 arrays and save them, late if i want to use, just open using ifstream.
which way is better, can you give me another way? how to create 10 3x4 random value arrays using ofstream? thanks
Li Zhiyuan
5/10/2006
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li zhiyuan wrote: one of friends suggested me i can create such 10 arrays and save them, late if i want to use, just open using ifstream
Your friend was right. The above is the right way to go on.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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how to create 10 3x4 random value arrays using ofstream? thanks a lot.
Li Zhiyuan
5/10/2006
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Well, roughly speaking, ofstream can store values on a file., it has nothing to do with array creation.
BTW you can
(1) create an array, assigning it random values.
(2) store it on file, using ofstream.
(3) later read file content (using ofstream) to build a new array having the same content of the original one.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Hello everyone,
How do you understand the Bjarne's comments about exception specification? Especially, "not required to be checked across compilation-unit" and "violations will not be caught at run time"?
section 14.6.1 Checking Exception Specifications
--------------------
Importantly, exception-specifications are not required to be checked exactly across compilation-unit boundaries. Naturally, an implementation could check. However, for many large and long-lived systems, it is important that the implementation does not -- or, if it does, than it carefully gives hard errors only where violations will not be caught at run time.
--------------------
thanks in advance,
George
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I'm creating a casino slot machine game as a win32 application.
When clicking on an image - I catch such event by locating the mouse position in LBUTTONDOWN message I need to implement following behavior:
1 - I replace the image by another image (a black button image)
2 - from now on, some logic change so that a click on this image cant happen
3 - eventually, after some Sleep() button change back to normal, and can be clicked
my problem is - if you click on the button when it is black, the click happens. that is because an LBUTTONDOWN message created, and it waits in the message queue.
when 'synchronous' logic ends, the image can be clicked, so the message 'from the past' takes action.
two solutions:
1 - clear the message queue - haven't try that.
2 - send my own message at the end of stage 2 of function. that message will trigger stage 3. Any messages caught during stage 1-2 would take action before my custom message and it should act as desired.
BUT unfortunately, it looks like this message get before all the 'messages from the past'.
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Hanan888 wrote: my problem is - if you click on the button when it is black, the click happens. that is because an LBUTTONDOWN message created, and it waits in the message queue
Why don't you use a flag (losely speaking, a global variable) marking the current button status as 'black' or not?
In the LBUTTONDOWN message handler then you can choose the proper action to do depending on that flag value.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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thanks but problem is different :
stage 1 of function -> 'button' becomes unclickable
{,,,,,,,,,,,,,,,,,,}
{,,,,,,,,,,,,,,,,,,} 'bad user' clicks on the black button - creates LBUTTONDOWN
{10 second duration} ('LBUTTONDOWN from the past')
{..................}
{..................}
need to trigger stage 2 of function -> becomes clickable
'LBUTTONDOWN from the past' create unwanted behavior
thats whay I tried to first do stage 1 - in the end business-logic 'flags' that button is unclickable
PostMessage(TRIGGER_STAGE_2....)
stage 2 happens
'LBUTTONDOWN from the past' happened between stage 1 and 2 so everything works right
but it seems like my TRIGGER_STAGE_2 push in the queue to be first (?!) so
'LBUTTONDOWN from the past' again happens in a bad time for me 
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The real question, IMHO, is: Why are you blocking the message queue for such a long time?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
[my articles]
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Thats a very good question which I actually didn't ask myself until now.
It looks like SetTimer() solved my problem, without blocking message queue.
thanks
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