What I write is PC entrance guard personnel information management system, can accept from the machine is receiving data, and lower machine communication online example of this I like writing, similar to the instant messaging software, now have the following problems
1. Bring out the module used alone, to test the link with the client, and there is no problem, you can link, also can communicate, as shown in figure:

2. Now I add the separate modules to my personnel information management system, using the client connection, can appear error, to start listening to the port, the client connect to the server, the program is error
Under 3. Could you please tell me if this is due to the reason of thread application error, my original idea is to click on the button to start listening to will open up a new thread, which interface disappeared can continue to receive the client sends data, and deposited in the database,

4. Before had not learned C/C + +, this is a little bit to find information online written mimic other people's code, so please prawn people to answer the question when specific point! Please!
5. And I always can not put, don't know how to give points

CodePudding user response:

Collapsed in the pop-up dialog box, press the corresponding button to enter debugging press Alt + 7 key to view the Call Stack, namely "the Call Stack" from the inside to the following out of from the inner to outer function Call history, double-click a row to the cursor to the Call of the source code or assembly instruction, don't understand when double click on the next line, until we can read ,

CodePudding user response:

First take a look at your code error call stack location, see some phenomenon should be a pointer initialization etc. There is a problem, after you put the thread, whether some initialization actions to do

CodePudding user response:

reference 1st floor zhao4zhong1 response:

collapsed in the pop-up dialog box, press the corresponding button to enter debugging press Alt + 7 view the Call Stack that is "the Call Stack" from the inside to the following out of from the inner to outer function Call history, double-click a row to the cursor to the Call of the source code or assembly instruction, don't understand, until can read ,

Thank you I try!

CodePudding user response:

reference 1st floor zhao4zhong1 response:

collapsed in the pop-up dialog box, press the corresponding button to enter debugging press Alt + 7 view the Call Stack that is "the Call Stack" from the inside to the following out of from the inner to outer function Call history, double-click a row to the cursor to the Call of the source code or assembly instruction, don't understand, until can read ,

I plan to open new thread, because I don't know how to write, not open threads, just in the entrance guard management system into the interface, and then test the client connection will appear above the mistake

CodePudding user response:

refer to the second floor oyljerry response:

first take a look at your code error call stack location, see some phenomenon should be a pointer initialization etc. There is a problem, after you put the thread, whether some initialization actions to do

I plan to open new thread, because I don't know how to write, not open threads, just in the entrance guard management system into the interface, and then test the client connection will appear above the mistake