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c++ - Qt connect function reports error?

{Code...} Both connections reported errors {Code...} The classes used all inherit QObject and contain Q_OBJECT...

From [C++discussion group] 2017-06-19 09:07:26 0  2  1478

How to non-block input in C language (check if stdin has content)

getchar, scanf, getch, these will block if the user does not input. What should I do if I don't want to block?...

From [C++discussion group] 2017-06-17 09:16:16 0  1  1953

c++ - How to set win7 to not require a password when booting without deleting the administrator password (the password is not empty)?

I want a password, but I don’t need it when I turn on the computer.

From [C++discussion group] 2017-06-17 09:16:11 0  3  1123

c++ - Traversing binary tree appears

{Code...} Example: 4 2 1 # # 3 # # 5 # 6 # # (enter in order) I don’t know what went wrong. . . The code only ...

From [C++discussion group] 2017-06-17 09:16:08 0  2  871

c++ - How to determine if two variables are equal

The pointer variable PVOID lpbuffer points to a memory address, variable GUID g = {0x25a207b9,0xddf3,0x4660,{0...

From [C++discussion group] 2017-06-17 09:15:56 0  3  1458

How to get variable value in blocking function in python

Currently, the C++ embedded python function is used. The python function is a blocking type of receiving serve...

From [C++discussion group] 2017-06-17 09:15:52 0  1  1046

java - How to design a class in this case? Are there any design patterns?

A kind of data passing through the hardware device uses a special format. The first paragraph is the id, and t...

From [C++discussion group] 2017-06-17 09:15:50 0  5  999

How to implement bind yourself?

{Code...} I don’t understand the code in the middle. How is it implemented with part 3? Who can write a simple...

From [C++discussion group] 2017-06-15 09:23:57 0  1  1012

A malloc problem in c++ linked list

I defined a structure as follows: {Code...} There is a vector in this structure, and now I want to use it as a...

From [C++discussion group] 2017-06-14 10:51:40 0  1  945

c++ - cocos2d cannot be downloaded? Help! ! !

Recently I want to learn cocos2d game development, and I want to use the lua language. I don’t know what the r...

From [C++discussion group] 2017-06-13 09:22:55 0  1  1045

c++ - printf uses %s to output a character array of length 4, but the actual number of output digits is not 4

As shown in the figure, it is originally a character array with a length of 4. If you use %c to manually outpu...

From [C++discussion group] 2017-06-12 09:24:55 0  1  1410

Issues with constructor functions in writing high-precision templates using C++ structures

Confused about the structure overloading operator What is the function of {code...} in {code...}? If you delet...

From [C++discussion group] 2017-06-12 09:24:48 0  1  1183

c++ - What is the use of union in C language?

RT, the last assignment of this structure will overwrite the previous assignment, so I’m curious as to what sc...

From [C++discussion group] 2017-06-12 09:24:44 0  5  1117

c++ - What do itoa and atoi mean in C?

itoa means i to a? i represents int, so what about a?

From [C++discussion group] 2017-06-12 09:24:38 0  2  1311

c++ - Can functions with the same name with different parameters in a derived class be declared as virtual functions

When the base class and the derived class have functions with the same name, regardless of whether the number ...

From [C++discussion group] 2017-06-10 09:48:57 0  1  1446