#include <fstream> #include <opencv2/opencv.hpp> std::vector<std::string> load_class_list() {
时间: 2023-09-18 19:14:10 浏览: 124
这段代码的目的是加载一个类列表。它使用了两个头文件 `fstream` 和 `opencv2/opencv.hpp`。`fstream` 头文件提供了文件输入输出的功能,`opencv2/opencv.hpp` 是 OpenCV 库的头文件。
函数 `load_class_list()` 的返回类型是 `std::vector<std::string>`,表示返回一个字符串类型的向量。
你还没有问问题,你只是在描述代码。请问你有什么问题吗?
相关问题
C++中通过opencv读取txt文件,并将其解析为vector<string>格式
### 回答1:
在 C++ 中使用 OpenCV 读取 txt 文件并将其解析为 vector<string> 格式可以使用以下代码:
```
#include <opencv2/opencv.hpp>
#include <vector>
#include <string>
using namespace std;
int main() {
string filename = "example.txt";
vector<string> data;
ifstream file(filename);
if(file.is_open()) {
string line;
while(getline(file, line)) {
data.push_back(line);
}
file.close();
}
return 0;
}
```
在这段代码中,我们首先声明了一个文件名变量,一个 vector 变量 data 和一个 ifstream 变量 file。然后我们使用 ifstream 类的构造函数打开文件,并使用 is_open() 函数判断文件是否正常打开。如果文件打开成功,我们使用 getline() 函数逐行读取文件的内容并将每行的内容插入到 vector 变量 data 中。最后,我们关闭文件。
### 回答2:
在C中通过OpenCV读取txt文件,并将其解析为vector<string>格式的步骤如下:
1. 导入必要的头文件:
```c++
#include <iostream>
#include <fstream>
#include <vector>
#include <opencv2/opencv.hpp>
```
2. 创建一个函数来读取txt文件并解析为vector<string>格式:
```c++
std::vector<std::string> readTXTFile(const std::string& filename) {
std::vector<std::string> lines;
std::ifstream file(filename);
if (file.is_open()) {
std::string line;
while (std::getline(file, line)) {
lines.push_back(line);
}
file.close();
} else {
std::cout << "Error opening file: " << filename << std::endl;
}
return lines;
}
```
3. 使用OpenCV中的 imread 函数读取txt文件:
```c++
std::string filename = "data.txt"; // txt文件名
cv::Mat image = cv::imread(filename, cv::IMREAD_GRAYSCALE);
```
4. 将读取的图像数据解析为vector<string>格式:
```c++
std::vector<std::string> lines;
for (int i = 0; i < image.rows; i++) {
std::string line;
for (int j = 0; j < image.cols; j++) {
int pixel_value = static_cast<int>(image.at<uchar>(i, j));
line += std::to_string(pixel_value) + " ";
}
lines.push_back(line);
}
```
5. 打印解析后的数据:
```c++
for (const auto& line : lines) {
std::cout << line << std::endl;
}
```
以上是通过OpenCV在C中读取txt文件并将其解析为vector<string>格式的步骤。
### 回答3:
在C++中利用OpenCV读取txt文件并解析为vector<string>格式可以通过以下步骤实现:
1. 首先,需要包含OpenCV的头文件和iostream头文件:
```c++
#include <opencv2/opencv.hpp>
#include <iostream>
```
2. 接下来,创建一个函数来读取txt文件并解析为vector<string>格式,函数原型如下:
```c++
std::vector<std::string> readTxtFile(const std::string& filename);
```
3. 在函数中,首先定义一个存储解析后字符串的vector<string>,例如:
```c++
std::vector<std::string> strVector;
```
4. 使用OpenCV的FileStorage类来读取txt文件:
```c++
cv::FileStorage fs(filename, cv::FileStorage::READ);
if (!fs.isOpened()) {
std::cerr << "Failed to open txt file." << std::endl;
return strVector;
}
```
5. 利用OpenCV的FileNode和FileNodeIterator对文件进行解析:
```c++
cv::FileNode rootNode = fs["data"];
if (rootNode.empty()) {
std::cerr << "Empty data node." << std::endl;
return strVector;
}
cv::FileNodeIterator it = rootNode.begin();
cv::FileNodeIterator it_end = rootNode.end();
for (; it != it_end; ++it) {
std::string str = (std::string)*it;
strVector.push_back(str);
}
```
6. 最后,返回解析后的字符串向量:
```c++
return strVector;
```
以下是完整的示例代码:
```c++
#include <opencv2/opencv.hpp>
#include <iostream>
std::vector<std::string> readTxtFile(const std::string& filename) {
std::vector<std::string> strVector;
cv::FileStorage fs(filename, cv::FileStorage::READ);
if (!fs.isOpened()) {
std::cerr << "Failed to open txt file." << std::endl;
return strVector;
}
cv::FileNode rootNode = fs["data"];
if (rootNode.empty()) {
std::cerr << "Empty data node." << std::endl;
return strVector;
}
cv::FileNodeIterator it = rootNode.begin();
cv::FileNodeIterator it_end = rootNode.end();
for (; it != it_end; ++it) {
std::string str = (std::string)*it;
strVector.push_back(str);
}
return strVector;
}
int main() {
std::vector<std::string> strVector = readTxtFile("data.txt");
for (const auto& str : strVector) {
std::cout << str << std::endl;
}
return 0;
}
```
这样,就可以通过OpenCV读取txt文件并解析为vector<string>格式。
修改以下代码使其能够接受视频并保存到本地,上传到数据库void ShowVideo() { //创建数据库连接 MYSQL mysql; mysql_init(&mysql); mysql_real_connect(&mysql, "localhost", "root", "123456", "myserver", 3306, NULL, 0); mysql_query(&mysql, "set names utf8"); SOCKET server = socket(AF_INET, SOCK_STREAM, 0); char buffer[2048] = " "; SOCKET sockConn = accept(server, NULL, NULL); Mat videoData; while (true) { int bytes = recv(sockConn, buffer, 2048, 0); if (bytes <= 0) break; // 将接收到的视频数据拼接在一起 videoData.push_back(Mat(1, bytes, CV_8UC1, buffer).clone()); } closesocket(sockConn); //size_t fileSize = 0; std::ofstream videoFile("server_video.avi", std::ios::binary | std::ios::app); while (true) { int bytes = recv(sockConn, buffer, 2048, 0); if (bytes <= 0) break; //fileSize += bytes; // 将接收到的视频数据写入到.avi文件中 //std::ofstream videoFile("server_video.avi", std::ios::binary | std::ios::app); videoFile.write(buffer, bytes); } videoFile.close(); VideoWriter writer("server_video.avi", cv::VideoWriter::fourcc('M', 'J', 'P', 'G'), 25.0, Size(640, 480)); if (writer.isOpened()) { //writer.write(videoData); cout << "打开失败" << endl; return; } //读取视频文件内容并保存到数据库 ifstream fin("server_video.avi", ios::binary | ios::in); if (!fin) { cout << "打开文件失败" << endl; exit(0); } fin.seekg(0, ios::end); int filesize = fin.tellg(); fin.seekg(0, ios::beg); char* fileContent = new char[filesize]; fin.read(fileContent, filesize); string fileContentStr(fileContent, filesize); //将视频内容上传到数据库 string strSql = "INSERT INTO videos(content) VALUES('"+ fileContentStr + "')"; mysql_query(&mysql, strSql.c_str()); delete[] fileContent; fin.close(); mysql_close(&mysql); closesocket(sockConn); closesocket(server); WSACleanup(); }
注:为了确保代码的正确性和安全性,以下是修改后的代码:
```cpp
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <sstream>
#include <string>
#include <fstream>
#include <vector>
#include <winsock.h>
#include <mysql.h>
#include <opencv2/opencv.hpp>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "libmysql.lib")
void SaveVideoToDatabase(const std::string& videoPath, MYSQL* mysql) {
std::ifstream file(videoPath, std::ios::in | std::ios::binary);
if (file) {
file.seekg(0, std::ios::end);
std::streampos fileSize = file.tellg();
file.seekg(0, std::ios::beg);
std::vector<char> videoData(fileSize);
file.read(videoData.data(), fileSize);
file.close();
std::string videoDataStr(videoData.data(), fileSize);
std::string strSql = "INSERT INTO videos(content) VALUES('" + videoDataStr + "')";
if (mysql_query(mysql, strSql.c_str()) != 0) {
std::cerr << "Failed to save video to database." << std::endl;
}
else {
std::cout << "Video saved to database successfully." << std::endl;
}
}
else {
std::cerr << "Failed to open video file." << std::endl;
}
}
void ShowVideo() {
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
std::cerr << "Failed to initialize winsock." << std::endl;
return;
}
SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, 0);
if (serverSocket == INVALID_SOCKET) {
std::cerr << "Failed to create socket." << std::endl;
WSACleanup();
return;
}
sockaddr_in serverAddress{};
serverAddress.sin_family = AF_INET;
serverAddress.sin_port = htons(12345); // 修改为服务端的端口号
serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(serverSocket, reinterpret_cast<sockaddr*>(&serverAddress), sizeof(serverAddress)) != 0) {
std::cerr << "Failed to bind socket." << std::endl;
closesocket(serverSocket);
WSACleanup();
return;
}
if (listen(serverSocket, 1) != 0) {
std::cerr << "Failed to listen on socket." << std::endl;
closesocket(serverSocket);
WSACleanup();
return;
}
std::cout << "Waiting for client connection..." << std::endl;
SOCKET clientSocket = accept(serverSocket, NULL, NULL);
if (clientSocket == INVALID_SOCKET) {
std::cerr << "Failed to accept client connection." << std::endl;
closesocket(serverSocket);
WSACleanup();
return;
}
std::vector<char> videoData;
char buffer[2048];
int bytesRead = 0;
while ((bytesRead = recv(clientSocket, buffer, sizeof(buffer), 0)) > 0) {
videoData.insert(videoData.end(), buffer, buffer + bytesRead);
}
closesocket(clientSocket);
closesocket(serverSocket);
WSACleanup();
std::string videoPath = "server_video.avi"; // 修改为要保存的视频文件路径
std::ofstream videoFile(videoPath, std::ios::binary);
if (videoFile) {
videoFile.write(videoData.data(), videoData.size());
videoFile.close();
std::cout << "Video saved successfully." << std::endl;
MYSQL mysql;
mysql_init(&mysql);
if (mysql_real_connect(&mysql, "localhost", "root", "123456", "myserver", 3306, NULL, 0) != NULL) {
std::cout << "Connected to MySQL database." << std::endl;
SaveVideoToDatabase(videoPath, &mysql);
mysql_close(&mysql);
}
else {
std::cerr << "Failed to connect to MySQL database." << std::endl;
}
}
else {
std::cerr << "Failed to save video." << std::endl;
}
}
```
请确保以下几点:
1. 修改 `serverAddress.sin_port` 为服务端的端口号。
2. 修改 `videoPath` 为要保存的视频文件路径。
3. 修改 `mysql_real_connect` 函数的参数来连接到正确的 MySQL 数据库。
注意:这是一个简单的示例代码,仅展示了如何接收视频数据并将其保存到本地和上传到数据库。实际情况可能需要进行更多的错误处理和安全性考虑。
阅读全文