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How to concatenate two strings in C++?
...
First of all, don't use char* or char[N]. Use std::string, then everything else becomes so easy!
Examples,
std::string s = "Hello";
std::string greet = s + " World"; //concatenation easy!
Easy, isn't it?
Now if you need char const * for some reason, such as when you wan...
error C2664: “find_char”: 不能将参数 1 从“const char [14]”转换为“...
...find_char”: 不能将参数 1 从“const char [14]”转换为“std::string &出错代码：#include <iostream>#include <string>using std::cout;using std::endl;using std::string; const引用形参举例 非const...出错代码：
#include <iostream>
#include <string>
using std::cout;
usi...
How much is the overhead of smart pointers compared to normal pointers in C++?
... the iteration is done you'll know you have to erase it. So you could gain extra memory from not using a smart_ptr...
But do you really want to do that?
A single memory leak could make your product have a point of failure in time (let's say your program leaks 4 megabytes each hour, it would take mon...
VC DDE（Dynamic Data Exchange）与EXCEL连接 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e application.
//
#include "stdafx.h"
#include "windows.h"
#include <string.h>
#include "ddeml.h"
#include "stdio.h"
HDDEDATA CALLBACK DdeCallback(
UINT uType, // Transaction type.
UINT uFmt, // Clipboard data format.
HCONV hconv, // Handle to the conversation.
...
Yes/No message box using QMessageBox
...))
{
// do stuff
}
It is generally a good Qt habit to put code-level Strings within a tr("Your String") call.
(QMessagebox as above works within any QWidget method)
EDIT:
you can use QMesssageBox outside a QWidget context, see @TobySpeight's answer.
If you're even outside a QObject conte...
Can I mask an input text in a bat file?
...ate the "echo -n" command from the bash shell. It sets passwd to an empty string as an irrelevant side effect and doesn't wait for input since it's taking its input from the nul: device.
The "for /f "delims=" %%i in ('cscript /nologo getpwd.vbs') do set passwd=%%i" statement is the trickiest bit. ...
How well is Unicode supported in C++11?
...ibrary facilities that might provide Unicode support gives me this list:
Strings library
Localization library
Input/output library
Regular expressions library
I think all but the first one provide terrible support. I'll get back to it in more detail after a quick detour through your other questi...
Calling C++ class methods via a function pointer
...ility with member pointers - Visual C++, at least in the past, needed some extra clues about how to represent member pointer types. I'd use the static function approach for an embedded system - the representation of a pointer is the same as any other function pointer, the costs are obvious, and ther...
Creating Unicode character from its number
...
Just cast your int to a char. You can convert that to a String using Character.toString():
String s = Character.toString((char)c);
EDIT:
Just remember that the escape sequences in Java source code (the \u bits) are in HEX, so if you're trying to reproduce an escape sequence, y...
QString to char* conversion
I was trying to convert a QString to char* type by the following methods, but they don't seem to work.
10 Answers
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