std::vector<unsigned char>如何转std::string
时间: 2023-11-17 15:05:15 浏览: 40
引用中提供了一个示例函数`Vec2Str`,可以将`std::vector<unsigned char>`转换为`std::string`。该函数首先使用`reserve`函数来为目标字符串`StrChar`分配足够的内存空间,然后使用`push_back`函数将每个字符逐个添加到`StrChar`中。
下面是使用`Vec2Str`函数将`std::vector<unsigned char>`转换为`std::string`的示例代码:
```cpp
void Vec2Str(std::vector<unsigned char>& VecChar, std::string& StrChar) {
StrChar.reserve(VecChar.size());
for (int iIndex = 0; iIndex < VecChar.size(); iIndex++) {
StrChar.push_back(static_cast<char>(VecChar[iIndex]));
}
}
// 示例用法
std::vector<unsigned char> VecChar;
// 添加元素到VecChar
std::string StrChar;
Vec2Str(VecChar, StrChar);
```
相关问题
std::vector<unsigned char>如何转std::string和相互转换
std::vector<unsigned char>可以通过以下两种方法转换为std::string和相互转换:
1. 将std::vector<unsigned char>转换为std::string:
- 首先,使用std::stringstream来创建一个临时的字符串流。
- 然后,使用std::copy将vector中的元素复制到字符串流中。
- 最后,使用std::stringstream的str()函数将字符串流转换为std::string类型。
示例代码如下:
```
std::vector<unsigned char> vecChar;
// 填充vecChar
std::stringstream ss;
std::copy(vecChar.begin(), vecChar.end(), std::ostream_iterator<unsigned char>(ss));
std::string strChar = ss.str();
```
2. 将std::string转换为std::vector<unsigned char>:
- 首先,使用std::string的begin()和end()函数获取字符串的起始和结束迭代器。
- 然后,使用std::vector<unsigned char>的构造函数将迭代器范围内的元素复制到新的vector中。
示例代码如下:
```
std::string strChar = "example";
std::vector<unsigned char> vecChar(strChar.begin(), strChar.end());
```
qt父窗口mainwindow有两个容器vector<string> delete_pathlists; vector<unsigned char> crosstypelists; 在子窗口deletewindow上显示出来,给出C++完整示例
好的,以下是一个简单的示例:
MainWindow.h:
```cpp
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <vector>
#include <string>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_deleteButton_clicked();
private:
Ui::MainWindow *ui;
std::vector<std::string> delete_pathlists;
std::vector<unsigned char> crosstypelists;
};
#endif // MAINWINDOW_H
```
MainWindow.cpp:
```cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "deletewindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
// 添加一些示例数据
delete_pathlists.push_back("path1");
delete_pathlists.push_back("path2");
delete_pathlists.push_back("path3");
crosstypelists.push_back(1);
crosstypelists.push_back(2);
crosstypelists.push_back(3);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_deleteButton_clicked()
{
// 创建删除窗口并传递数据
DeleteWindow *deleteWindow = new DeleteWindow(this, delete_pathlists, crosstypelists);
deleteWindow->show();
}
```
DeleteWindow.h:
```cpp
#ifndef DELETEWINDOW_H
#define DELETEWINDOW_H
#include <QDialog>
#include <vector>
#include <string>
namespace Ui {
class DeleteWindow;
}
class DeleteWindow : public QDialog
{
Q_OBJECT
public:
explicit DeleteWindow(QWidget *parent = nullptr,
const std::vector<std::string>& delete_pathlists = std::vector<std::string>(),
const std::vector<unsigned char>& crosstypelists = std::vector<unsigned char>());
~DeleteWindow();
private:
Ui::DeleteWindow *ui;
};
#endif // DELETEWINDOW_H
```
DeleteWindow.cpp:
```cpp
#include "deletewindow.h"
#include "ui_deletewindow.h"
DeleteWindow::DeleteWindow(QWidget *parent,
const std::vector<std::string>& delete_pathlists,
const std::vector<unsigned char>& crosstypelists) :
QDialog(parent),
ui(new Ui::DeleteWindow)
{
ui->setupUi(this);
// 在窗口中显示数据
for (const auto& path : delete_pathlists) {
ui->pathList->addItem(QString::fromStdString(path));
}
for (const auto& type : crosstypelists) {
ui->typeList->addItem(QString::number(type));
}
}
DeleteWindow::~DeleteWindow()
{
delete ui;
}
```
在这个示例中,我们在 `MainWindow` 中创建了一个 `vector<string>` 和一个 `vector<unsigned char>`,然后在点击删除按钮时打开了一个 `DeleteWindow` 窗口并将这些数据传递给它,在 `DeleteWindow` 中我们可以将这些数据显示在两个列表中。