General and Desktop

Hi there, When you call the QProcess::startDetached() you will not have a QProcess identifier (member variable) so your program is unaware of any already running programs. That shouldn't be any different between Mac and Win. What the difference might be is the startup sequence of the process started. Maybe it checks if it is already running and doesn't start again. If the programmer made an error there the difference between Mac and Win is explainable. A solution otherwise is to keep a member variable of QProcess and when the program needs to be started again check if the program is still running. You get a signal if anything happens with the QProgress that you already started. If you want to close your application, but keep the other program active, just exit the program and the program should keep on going. If you want to close it, you simple call qproc.close(); Hope this helps!

There is insufficient information to tell us why this is failing. Here are some observations and questions to ask yourself. You don't need to explicitly call open() on the QTcpSocket, that will be done by the connectToHost() call. The flush() on line 7 has no purpose. Is the specified host listening on that interface and port? Is an error reported? Does your write() call return the expected number of bytes? Are warning message visible in the program console/debug output? Have you verified that the server receives the bytes? Have you verified that the server sends a response? Even if you received a readyRead() signal you have not heeded the warning in the docs regarding checking that there are sufficient bytes available before using the streaming operator. The entire response may not arrive in a single chunk. This code may still not function.

listview is not for my application, I use some tableview features,such as: setColumnWidth setRowHeight setGridStyle and itemDelegate and customlize tablemodel And I found the link above is sort multiple columns but not multiple columns as one list and subclass QSortFilterProxy to achive is very difficulty for such sort policy so at last, I manage to sort my Model Data myself,and reset the tableview.

This might get you what you are looking for. @QTextCursor cur(TextEdit->document()); QTextCharFormat charformat; for (int i = 1; i <= TextEdit->length(); i++) { cur.setPosition(i); charformat = cur.charFormat(); } @ The setPosition method doesn't state what index it starts from but I think index 0 would be before the first character in your document and index = length() would be right after the last character.

Boy, it sure sounds I should be glad I don't have to use your application... Anyway, best of luck!

I solved my problem by making an signal on graphicsview, so i can emit signal on mousemove() of graphicview and update display on Lcdnumber

sorry I sent the wrong code.but it might be something like that. there i put the packet size at the beginning of the packet to be sent.i think you just need to put there what you want to send. Sorry for mistakes i'm newbie

Now, that is a Qt Creator issue :-) I guess it is because the labels of the checkboxes behave the same anyway?

It is actually shown as both checked and disabled, but the only difference is that the contents of the button has been slightly shifted. That is too subtle to notice. There are two ways around it, and both have disadvantages: create a proxy style to render the button differently in this case. use a style sheet do define your own styling.

Thanks for clearing that up. It makes sense now, and I can stop banging my head against the wall. The code you posted also works perfectly.

Memory leak still exists)) try to change to: @ proc = new QProcess(this); @ Did you run your app in debug mode (e.g. via F5 shortcut)?

thanks, that helped a lot!

thank you for your reply