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以下代码或多或少只是从 MSDN 文档中复制而来。在 Windows Vista 和 Windows 7 上它工作正常，但在 XP 上崩溃时调用InternetQueryOption. 任何人都知道问题可能是什么？

int main(int argc, char* argv[])
{

  HINTERNET hInternet = InternetOpen("x", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
  //
  // 1. Set
  //
  {
    INTERNET_PER_CONN_OPTION_LIST    List;
    INTERNET_PER_CONN_OPTION         Option[2];
    unsigned long                    nSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);

    Option[0].dwOption = INTERNET_PER_CONN_AUTOCONFIG_URL;
    Option[0].Value.pszValue = "http://myserver/get_proxy_info.dll";
    Option[1].dwOption = INTERNET_PER_CONN_FLAGS;
    Option[1].Value.dwValue = PROXY_TYPE_AUTO_PROXY_URL;

    List.dwSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);
    List.pszConnection = NULL;
    List.dwOptionCount = 2;
    List.dwOptionError = 0;
    List.pOptions = Option;

    if(!InternetSetOption(hInternet, INTERNET_OPTION_PER_CONNECTION_OPTION, &List, nSize))
       printf("InternetQueryOption failed! (%d)\n", GetLastError());
  }
  //
  // 2. Query
  //
  {
    INTERNET_PER_CONN_OPTION_LIST    List;
    INTERNET_PER_CONN_OPTION         Option[5];
    unsigned long                    nSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);

    Option[0].dwOption = INTERNET_PER_CONN_AUTOCONFIG_URL;
    Option[1].dwOption = INTERNET_PER_CONN_AUTODISCOVERY_FLAGS;
    Option[2].dwOption = INTERNET_PER_CONN_FLAGS;
    Option[3].dwOption = INTERNET_PER_CONN_PROXY_BYPASS;
    Option[4].dwOption = INTERNET_PER_CONN_PROXY_SERVER;

    List.dwSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);
    List.pszConnection = NULL;
    List.dwOptionCount = 5;
    List.dwOptionError = 0;
    List.pOptions = Option;

    printf("InternetQueryOption:\n");
    if(!InternetQueryOption(hInternet, INTERNET_OPTION_PER_CONNECTION_OPTION, &List, &nSize))
       printf("InternetQueryOption failed! (%d)\n", GetLastError());
       if(Option[0].Value.pszValue != NULL)
       printf("%s\n", Option[0].Value.pszValue);

    if((Option[2].Value.dwValue & PROXY_TYPE_AUTO_PROXY_URL) == PROXY_TYPE_AUTO_PROXY_URL)
      printf("PROXY_TYPE_AUTO_PROXY_URL\n");

    if((Option[2].Value.dwValue & PROXY_TYPE_AUTO_DETECT) == PROXY_TYPE_AUTO_DETECT)
       printf("PROXY_TYPE_AUTO_DETECT\n");

    INTERNET_VERSION_INFO      Version;
    nSize = sizeof(INTERNET_VERSION_INFO);

    InternetQueryOption(hInternet, INTERNET_OPTION_VERSION, &Version, &nSize);

    if(Option[0].Value.pszValue != NULL)
       GlobalFree(Option[0].Value.pszValue);

    if(Option[3].Value.pszValue != NULL)
       GlobalFree(Option[3].Value.pszValue);

    if(Option[4].Value.pszValue != NULL)
       GlobalFree(Option[4].Value.pszValue);

  }

}

在 Windows XP 中，它在试图访问NULL指针后面的内容时遇到内存访问冲突。

    wininet.dll!PROXY_SERVER_LIST::CopyString(void) Unknown
    wininet.dll!PROXY_INFO::GetProxySettings(struct INTERNET_PROXY_INFO_EX *,int)   Unknown
    wininet.dll!PROXY_INFO_GLOBAL::GetProxySettings(struct INTERNET_PROXY_INFO_EX *,int)    Unknown
    wininet.dll!QueryPerConnOptions(void *,int,struct INTERNET_PER_CONN_OPTION_LISTA *) Unknown
    wininet.dll!_InternetQueryOptionA@16()  Unknown
>   InternetQueryOption.exe!main(int argc=1, char * * argv=0x003e2e60) Line 55  C++
    InternetQueryOption.exe!__tmainCRTStartup() Line 278    C
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