hello, i have created qt application for mini2440 board which contains more than 40 tabs pages of single tab widget.In this application i observed that the application performance degrades (slow down) after some time. board touch screen takes more time to seance click events. i am glad to knew what the problem is ? and any of you facing the same thing? ?? thanks!!!!!!
Memory leaks ? Regards Luc
ya..i thought memory leaks may be the issue but its really not as i cross checked all my code for leaks. i think it is related to the serial port (TTL) buffers as i am communicating with it but not very much sure can you suggest some regarding this. or any other issue?? Regards, sagar
Please post your c++ code for checking. If not then you're on your own sorry. marek
Here it is
unsigned char Ackment[4000];
.....
......
memset(Ackment, 0xAA, sizeof(Ackment));
........
........
while(read(fd,&buf1,1)>0)
{
if(......some codition...)
{
Ackment[i] = 0x11;
i++;
}
//printf("%d - %u %02x \n",i,(int)buf1, (int)buf1);
Ackment[i] = (int)buf1;
i++;
}
........
.......
free(Ackment);
the general syntax of code is like this .....where i am reading the serial
port
Or subclass QIODevice class http://doc.qt.nokia.com/4.7/qiodevice.html#details
no i am not using any subclass QIODevice class in my code. as m using that free() is it right there. or can i free(buf1) in my code
Why you free Ackment array which is statically defined? Fix your code and as I said use proper classes to get data from serial port.
ok ..i will make the use of that classes to get serial data and then let you know what happen ... ya one more thing can you plz provide some sample code for that classes.
http://qextserialport.cvs.sourceforge.net/viewvc/qextserialport/qextseri... is full of examples. Google is your friend ;) marek
according to ur suggestion i made changes in code and now the performance of Qt application is superb ......... really thanks for information and guidance provided by you "marek" thanks regards sagar
Hi Sagar, I have developed an application for Mini2440 using qt creator and cross compiled using qt4.6.3 and loaded into the kit which is working from terminal by giving ./myapp -qws It is running well. But now I want to launch the application from desktop by creating an icon on clicking it. Please help me how to run the app via icon from desktop
you must write qtopia app. not qt app. http://farm2440.blogspot.com/2010/07/hello-world-with-gui-application-fo...
hi, pavankumar just change the permission of you executable file and copy the file into the /bin/ directory you can easily run the application by clicking the icon. regards, sagar
Hi sagar, Thanks for your reply. For launching the application from desktop by creating icon, I have followed the tutorial http://farm2440.blogspot.com/ by creating desktop file, icon and executable and placed the respective files in respective locations. After that I have changed the permissions of my executable available at /opt/Qtopia/bin. But still I could n't run it. When I touch my icon on Mini2440 screen nothing happens. No error on the terminal. If I hold the icon for longer time I can see the properties of the application. But for other applications by single touch I could run them. Here is my ex1.desktop file [Desktop Entry] Version=1.0 Encoding=UTF-8 Name=ex1 Comment=An Example Program Exec=ex1 Icon=ex1 Type=Application GenericName[en_US]= Please let me know the exact procedure for how to run qt applications from desktop in Mini2440.
hi, copy your file to the linux /bin dir not in /opt/Qtopia/bin use cp /opt/Qtopia/bin/filename /bin/ and then change permission as chmod +x /bin/filename try this it will work regards, sagar
Hi Sagar, "copy your file to the linux /bin dir not in /opt/Qtopia/bin" I have done the same. But still i could n't launch my application Please help me out
hello,
have you copied your ex1.Desktop file to this path
/opt/Qtopia/apps/Applications/
if not you need to copy it and also keep it in the /bin/ directory
Hi, my exe is at /bin/ex1 my ex1.desktop is at /opt/Qtopia/apps/Applications/ my ex1 icon is at /opt/Qtopia/pics In my .desktop file [Desktop Entry] Version=1.0 Encoding=UTF-8 Name=ex1 Comment=An Example Program Exec=ex1 Icon=ex1 Type=Application GenericName[en_US]= if I change Name, the same name is appearing on Desktop on mini2440 and even Icon also appeared on the Desktop. But I cannot start my app from screen. Same app I could run from terminal as mentioned previously by giving ./ex1 -qws Please let me know what went wrong
[Desktop Entry] Version=1.0 Encoding=UTF-8 Name=your_program_name Comment=An Example Program Exec=your_program_name_in/opt/Qtopia/bin Icon=your_icon_name_in/opt/Qtopia/images Type=Application GenericName[en_US]=your_program_name also copy ex1 to all opt/Qtopia/bin and /opt/Qtopia/images
Hi Sagar, Thanks verymuch. It is working.Now I can run my apps from desktop by clicking icon But now I have got another problem. When my application is started and i touch the screen,application in the background or desktop icons are activated (slowly one after another for every tap). Is there a way to prevent the background apps from activating when running Qt application? Thanks a lot for your support
hi, i am not getting the exact thing that you are facing ..... if dont need other application remove them from the opt/qtopia/apps/Applications folder and only keep your your one
Immediately after startup, I am running my app from desktop by clicking the icon. When I click some buttons in GUI of my app, icons on desktop are clicked and they start running on the top of my GUI screen and for every touch on the GUI some other icon on the screen is activated and it starts running. On every touch screen event, background on the desktop is activated. Please let me know what could be the problem
in your Qt designer check the properties of your application mainly the focus one and background properties
hi pavan . i think u r trying to run a application which is developed in QT creator. and u copied that binary file to "2440". and you are launching the application. because of qtopia you unable to access touch screen in your application. qtopia is taking control over that. first disable qtopia in /etc/init.d/rcS file and and configure touch screen. and even launch your application from the rcS file only. Best Regards Raj
Hi, I have excatly the same. Events from touch screen are sent to the Qt app and to Qtopia, so when we touch the app, it also touch the desktop of Qtopia. Please, someone can post the full rcS file to launch the Qt app directly after that Linux is loaded. Thanks