【IE编程】获取IE版本_c++获取windows系统安装的ie版本-优快云博客

本文介绍了一种通过注册表获取当前Internet Explorer版本的方法。利用C++编写了相关代码，包括从注册表读取值、字符串分割等功能，最终实现获取IE版本并转换为相应的模式。

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1如何获取当前IE版本？

方法：从注册表获取

代码如下：

std::vector<std::string> StringSplit(const std::string &text, char sep) {
  std::vector<std::string> tokens;
  std::size_t start = 0, end = 0;
  while ((end = text.find(sep, start)) != std::string::npos) {
    tokens.push_back(text.substr(start, end - start));
    start = end + 1;
  }
  tokens.push_back(text.substr(start));
  return tokens;
}

LONG GetStringFromReg(HKEY key,
                      const std::string& key_name,
                      std::string* value,
                      const std::string& default_value) {
  *value = default_value;
  char buffer[512];
  DWORD buffer_size = sizeof(buffer);
  ULONG nError;
  nError = RegQueryValueExA(
      key, key_name.c_str(), 0, NULL, (LPBYTE)buffer, &buffer_size);
  if (ERROR_SUCCESS == nError) {
    *value = buffer;
  }
  return nError;
}

//获取版本
DWORD GetBrowserEmulationMode() {
  // http://msdn.microsoft.com/en-us/library/ee330720(v=vs.85).aspx

  int browserVersion = 7;
  std::string sBrowserVersion;
  HKEY key;
  bool success = true;
  std::string path("SOFTWARE\\Microsoft\\Internet Explorer");
  LONG nError = RegOpenKeyExA(HKEY_LOCAL_MACHINE, path.c_str(), 0, KEY_QUERY_VALUE, &key);

  if (nError != ERROR_SUCCESS) {
    success = false;
  } else {
    nError = GetStringFromReg(key, "svcVersion", &sBrowserVersion, "7");
    if (nError != ERROR_SUCCESS) {
      nError = GetStringFromReg(key, "version", &sBrowserVersion, "7");
      if (nError != ERROR_SUCCESS) {
        success = false;
      }
    }

    if (RegCloseKey(key) != ERROR_SUCCESS) {
      success = false;
    }
  }

  DWORD mode = -1;
  if (success) {
    browserVersion = std::atoi(StringSplit(sBrowserVersion, '.').at(0).c_str()); // convert base 16 number in s to int
    switch (browserVersion) {
    case 6:
      mode = 6000;
      break;
    case 7:
      mode = 7000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode. Default value for applications hosting the WebBrowser Control.
      break;
    case 8:
      mode = 8000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode. Default value for Internet Explorer 8
      break;
    case 9:
      mode = 9000; // Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode. Default value for Internet Explorer 9.
      break;
    case 10:
      mode = 10000;
      break;
    case 11:
      mode = 11000;
      break;

    default:
      // use IE10 mode by default
      mode = -1;
      break;
    }

  } else {
    mode = -1;
  }
  return mode;
}