C / C++ / MFC

12-Oct-13 4:10

Hello!

I had an error in my project created with QT and C++
I created Server which gets data from AudioInput and gives it to UDP Socket, there is no problem, but in Client's project I had a problem, when I tried to write data to AudioOutput device after UDP Socket gets this data from net

in my project error was in this line "int l = audioSource->read(audioBuffer,input);" in
"qaudiooutput_win32_p.cpp"

and this is Call Stack at time debugging which shows this

QtMultimediad4.dll!QAudioOutputPrivate::deviceReady() Line 579 + 0x1c bytes C++
QtMultimediad4.dll!QAudioOutputPrivate::qt_static_metacall(QObject * _o=0x00b53308, QMetaObject::Call _c=InvokeMetaMethod, int _id=1, void * * _a=0x00b51d20) Line 52 + 0x8 bytes C++
what I did wrong

PLEASE HELP!!!!! Frown | :(

Richard MacCutchan12-Oct-13 5:09

12-Oct-13 5:09

Mkhitar Sargsyan wrote:
what I did wrong

You forgot to tell us what the error was.

And please use <pre> tags around your code so it is readable, like so:

C++

int l = audioSource->read(audioBuffer,input);

Veni, vidi, abiit domum

Mkhitar Sargsyan13-Oct-13 23:35

13-Oct-13 23:35

I wrote this code.

QByteArray getdata;
getdata.resize(socket->pendingDatagramSize());
socket->readDatagram(getdata.data(),getdata.size(),&senderaddres,&senderport);

then

qbufferout.open(QIODevice::ReadWrite);
audioOutput->start(ioDeviceout);
qbufferout.write(getdata);
qbufferout.close();

but I have got error at time this function "qbufferout.write(getdata);" and error goes to this line
"int l = audioSource->read(audioBuffer,input);" this line is in the "qaudiooutput_win32_p.cpp"

Richard MacCutchan14-Oct-13 0:00

14-Oct-13 0:00

Well you still have not used <pre> tags round your code. And you still have not told us what the error is.

Veni, vidi, abiit domum

Mkhitar Sargsyan14-Oct-13 0:34

14-Oct-13 0:34

I don't know how use this

tags

Richard MacCutchan14-Oct-13 1:02

14-Oct-13 1:02

Select your code and click on the code button above the edit box.

Veni, vidi, abiit domum

Mkhitar Sargsyan14-Oct-13 0:42

14-Oct-13 0:42

how can I post here picture???????????

Richard MacCutchan14-Oct-13 1:04

14-Oct-13 1:04

You can't; just post the lines of code, indicate the line where the error occurs, and show the complete error message. It's only a simple matter of copy and paste.

Veni, vidi, abiit domum

Mkhitar Sargsyan14-Oct-13 1:20

14-Oct-13 1:20

void networking::Resive()
{
QByteArray getdata;
getdata.resize(socket->pendingDatagramSize());
socket->readDatagram(getdata.data(),getdata.size(),&senderaddres,&senderport);

qbufferout.open(QIODevice::ReadWrite);
audioOutput->start(ioDeviceout);
qbufferout.write(getdata);
//after this line it hase got error and goes to this one "int l = audioSource->read(audioBuffer,input)" //this isn't my code. it is code of QT

qbufferout.close();

}
and error message is it:
"First-chance exception at 0x586d997a in networking.exe: 0xC0000005: Access violation reading location 0xab216d6b."

and call stack shows this:
"QtMultimediad4.dll!QAudioOutputPrivate::deviceReady() Line 579 + 0x1c bytes "

Richard MacCutchan14-Oct-13 1:51

bcmenu.cpp for XP and 7/8

14-Oct-13 1:51

Access violation means that it is trying to read a memory location that is not part of the application's address space. The only way to diagnose such an error is to step through the code with your debugger and see where the bad address is getting set, or where a good address is getting overwritten.

Veni, vidi, abiit domum

DanYELL11-Oct-13 18:39

DanYELL

11-Oct-13 18:39

I have a simple project that compiles in VS2005. When I compile it in VS10, I get assertion errors in the file bcmenu.cpp. bcmenu.cpp was taken from this project

http://www.codeproject.com/Articles/22/Cool-Owner-Drawn-Menus-with-Bitmaps-Version-3-03

The first few comments on that link talk about the project not working for Windows XP if compiled in VS10. Any chance, anyone else has come across this and has a solution? I see the comments but my project compiles in VS10, runs fine on Vista, 7, & 8 but crashes on XP and I cant figure out from the comments what Im doing wrong.

Please let me know. If you have a revised bcmenu.cpp file that you can email me, that would be great.

Re: bcmenu.cpp for XP and 7/8

Richard MacCutchan11-Oct-13 22:24

what if thread terminated after the thread::joinable() test

11-Oct-13 22:24

There are some suggestions in the first message thread at the end of the article.

Veni, vidi, abiit domum

Wang Xin USTC11-Oct-13 3:01

Wang Xin USTC

11-Oct-13 3:01

havnig see a lot sample codes about c++11 thread like

// thread t;

if(t.joinable()){
t.join()
}

is it possible that t terminate after the if(...) test,which will result in a error when call t.join() , especially in the context of concurrency

appreciate for reading

Re: what if thread terminated after the thread::joinable() test

pasztorpisti11-Oct-13 3:44

pasztorpisti

11-Oct-13 3:44

It is possible that the thread actually finishes/terminates between the if and the join but it won't cause an error. Even if the thread terminates the kernel maintains the thread handle and/or a result object (with the thread exit code) that can be waited (and queried for the exit code). If the thread has already terminated when you call join then join returns immediately without problems.

EDIT: some additional qotes from http://en.cppreference.com/w/cpp/thread/thread/joinable[^]
"A thread that has finished executing code, but has not yet been joined is still considered an active thread of execution and is therefore joinable."

On windows (Winapi thread functions) you can have multiple handles to the same thread and when the thread terminates all handles become signaled and you can wait any of the handles any number of times until closing the handles. On unix like systems the pthread api is more restrictive: you get a thread handle when you create a (non-detached) thread and you have to wait exactly once and only once for the thread handle. If you don't wait for the thread handle then it causes a leak, if you wait for it multiple times then its an error. Waiting for it once gets the exitcode from the temp object (associated with the thread handle) and also frees this temp object.

Both behaviors can be simulated by a framework but C++11 chose something that is near to the unix philosophy (as implementing that on all platforms is simpler and more performant and usually enough).

BEGIN_MESSAGE_MAP never called?

bosfan11-Oct-13 0:29

bosfan

11-Oct-13 0:29

Hi,
i have this Problem in custom CHeaderCtrl control.
My message map look like this:

<br />
BEGIN_MESSAGE_MAP(CHeaderCtrlEx, CHeaderCtrl)<br />
// MACROS<br />
ON_WM_LBUTTONDOWN()<br />
ON_WM_MOUSEMOVE()<br />
ON_WM_LBUTTONDBLCLK()<br />
ON_REGISTERED_MESSAGE(WM_HDN_ENDDRAG, OnHdnEndDrag)<br />
END_MESSAGE_MAP()<br />

Now i want to send a message to this header control but they never received it,
i never had this before so i don't know what cause this?
In a example Project here from codeproject work this "custom header control" very nice, no problems, only in my project?
So what to check, where can be my mistake, what im doing wrong??

Thanks for any help!
regards
bosfan

Richard MacCutchan11-Oct-13 1:27

11-Oct-13 1:27

Did you add DECLARE_MESSAGE_MAP[^] in your class definition?

Veni, vidi, abiit domum

bosfan11-Oct-13 2:20

bosfan

11-Oct-13 2:20

Hi,
thans for Answer, yes i have all in my class definition.
It is the same project from:
Here in Codeproject

If i start this example all works fine, but not if i use this
in a new project.

Thanks
bosfan

Richard MacCutchan11-Oct-13 3:14

11-Oct-13 3:14

bosfan wrote:
It is the same project from:

Here in Codeproject

It may be worth talking to the author then.

bosfan wrote:
If i start this example all works fine, but not if i use this

in a new project.

Check what you have done that is different, it may help to diagnose the problem.

Veni, vidi, abiit domum

save Bmp image in sql server in vc++

bosfan11-Oct-13 3:16

bosfan

11-Oct-13 3:16

Hi, i solved, of course, my mistake what else -.-
I have a multiple inheritance of CHeaderCtrl and there was a fault.
big sorry Frown | :(

regards
bosfan

chetan78610-Oct-13 22:30

chetan786

10-Oct-13 22:30

I want a example in vc++
1. I want to save image in Sql Server.
2. how to Retrieve image from database

Re: save Bmp image in sql server in vc++

Richard MacCutchan10-Oct-13 23:42