C

Connecting to the Mysql database using C language involves two steps: 1. initialize a connection handle Structure 2. actually connect Use mysql_init to initialize the connection handle # Include MYSQL * mysql_init (MYSQL *); Generally, if you pass

The previous lesson demonstrates the first advanced function of CChart. This Lesson continues with the topic of the first lesson, introducing the most basic function of CChart-creating line charts. In the first lesson, curve data was added at

Starting from this lesson, I am stupid to introduce the complex views supported by several ccharts. This section first introduces the split view. The split here is of course not the split of the Wan. The so-called split view, that is, the partition

1. If the default value is set for a certain parameter in the function, the default value must be set for all the parameters following the parameter. 2. You can set the default value when declaring a function. You can also set the default value

If you are not familiar with underlying APIs, struct, and pointers, we do not recommend that you use APIs.The AAuto Standard Library provides more stable and convenient methods to solve common programming problems. You should try your best to use

This article requires the use of the WebService client program generated in the previous article. For details, see [url] http://commandos.blog.51cto.com/154976/130652#/url], but you only need to compile it into a dynamic or static Link Library. In

A thorough understanding of C VariablesVariables are the most basic and core concepts of C language. C variables are complex. Here we will make a summary and hope to help students who want to learn C.I. Recognition VariablesThe literal meaning of a

UnitTest ++ is a very small and convenient unit test tool used in the C ++ project. It provides functionality similar to CppUnit, But It minimizes the workload of case writing and makes it easier to use. All of these benefits from its clever

Reading the content of an EXCEL table with C ++ is a very troublesome task. Today I read the content of the EXCEL table with CStringArray mentioned in "VC ++", which is really good. This format is usually used to convert an EXCEL file into a CSV

In programs, strings are often to be processed. In addition to the summary of some char methods previously written, strings are often used for string processing. The following is a summary of its common methods: 1. Definition: string & operator =

Continue with the previous content today. Now that we have entered the 2D plot, let's continue to study the QPainter stuff! Anti-sample is an important concept in graphics to prevent the appearance of the phenomenon of "sawtooth. Many system

After talking about the basics of multithreading, let's talk about some of my experiences on porting. Porting win32 program multi-thread content to Linux cannot be simply transplanted according to function correspondence. However, through the

I talked about the internationalization process last time. Now let's take a look at the specific Code related to internationalization. In the code, we use tr () to mark the strings to be translated. The lupdate tool extracts the relevant strings

Using naming rules to differentiate Structure Variables, function parameters, and local variables helps improve program readability. For example, Figure 1 is a program written using the naming rules that I usually use. This rule is:1) for the member

Note that "precision" rather than "correctness" is used here. If the header file is not correctly included, the compiler will not generate the final target code. So what do I mean by using the word "exact? Contains two meanings.The first layer means

IO is actually a data interaction with other devices. In Linux, this concept may be clearer. Linux regards all devices as a file, so all IO is attributed to data interaction with files. Similarly, there is data interaction with other processes. This

Recently, a magic compile error occurred while using the namespace and the youyuan function. After thinking, the problem was finally solved. I hope it will be helpful to you. Let's talk about namespaces first. When writing a C Project, especially a

Chapter I: ExcludeClipRect exclude a rectangle in a cut area. As a result, this rectangle is not drawn when the cut area is drawn. for details about the ExcludeClipRect function, see MSDN. This function is used to exclude a part of a region and is

This time, we use C ++ for the development language and Qt for the development environment. There is nothing to explain when selecting C ++. Why Qt is selected Qt is free of charge Qt is a cross-platform development that can be released on

A few days ago, I looked at the source code of a project I wrote. Previously, due to the increase in processing cores, the problems found in practice were constantly involved in the Code. The Code of some modules was relatively mixed, and I had been