使用 C 实现验证码识别与自动化登录
- 安装所需依赖
首先,你需要安装以下库:
libcurl:用于发送 HTTP 请求。
OpenCV:用于图像处理。
Tesseract:用于 OCR 识别。
在 Ubuntu 系统中,你可以使用以下命令安装这些依赖:
bash
sudo apt-get install libcurl4-openssl-dev
sudo apt-get install libopencv-dev
sudo apt-get install tesseract-ocr libleptonica-dev
2. 下载验证码图片
使用 libcurl 下载验证码图片并保存到本地:
c
include <stdio.h>
include <stdlib.h>
include <curl/curl.h>
size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) {
size_t written = fwrite(ptr, size, nmemb, stream);
return written;
}
void download_captcha(const char *url, const char *save_path) {
CURL *curl;
FILE *fp;
CURLcode res;
curl = curl_easy_init();
if (curl) {
fp = fopen(save_path, "wb");
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
fclose(fp);
if (res != CURLE_OK) {
fprintf(stderr, "下载失败: %s\n", curl_easy_strerror(res));
} else {
printf("验证码图片已保存为 %s\n", save_path);
}
}
}
3. 图像处理和 OCR 识别
使用 OpenCV 和 Tesseract 进行图像处理和 OCR 识别:
c
include <opencv2/opencv.hpp>
include <tesseract/baseapi.h>
include <tesseract/ocrclass.h>
std::string recognize_captcha(const char *image_path) {
// 加载图像
cv::Mat image = cv::imread(image_path, cv::IMREAD_GRAYSCALE);
// 进行二值化处理
cv::threshold(image, image, 127, 255, cv::THRESH_BINARY);
// 保存处理后的图像(可选)
cv::imwrite("captcha_processed.png", image);
// 初始化 Tesseract
tesseract::TessBaseAPI *ocr = new tesseract::TessBaseAPI();
ocr->Init(NULL, "eng");
ocr->SetImage(image.data, image.cols, image.rows, 1, image.step[0]);
char *outText = ocr->GetUTF8Text();
std::string result(outText);
delete[] outText;
ocr->End();
return result;
}
4. 自动化登录
使用 libcurl 发送 POST 请求,模拟登录操作,并传递用户名、密码和识别出的验证码:
c
void login(const char *username, const char *password, const char *captcha) {
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://captcha7.scrape.center/login");
curl_easy_setopt(curl, CURLOPT_POST, 1L);
// 准备 POST 数据
char post_fields[256];
snprintf(post_fields, sizeof(post_fields), "username=%s&password=%s&captcha=%s", username, password, captcha);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_fields);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
if (res != CURLE_OK) {
fprintf(stderr, "登录失败: %s\n", curl_easy_strerror(res));
} else {
printf("登录成功\n");
}
}
}
5. 主程序
整合上述代码,创建主程序:
c
int main() {
const char *captcha_url = "https://captcha7.scrape.center/captcha.png";
const char *captcha_path = "captcha.png";
// 下载验证码
download_captcha(captcha_url, captcha_path);
// 识别验证码
std::string captcha_text = recognize_captcha(captcha_path.c_str());
printf("识别结果: %s\n", captcha_text.c_str());
// 登录
login("admin", "admin", captcha_text.c_str());
return 0;
}更多内容联系1436423940