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POInternetQueryOption crashes on Windows XP
 

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  1. POInternetQueryOption crashes on Windows XP
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    <p>The following code is more or less just copied from MSDN documentation. On Windows Vista and Windows 7 it works fine, but in crashes on XP with an access violation int the call to <code>InternetQueryOption</code>. Anyone got an idea what the problem could be?</p> <pre><code>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, &amp;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, &amp;List, &amp;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 &amp; PROXY_TYPE_AUTO_PROXY_URL) == PROXY_TYPE_AUTO_PROXY_URL) printf("PROXY_TYPE_AUTO_PROXY_URL\n"); if((Option[2].Value.dwValue &amp; 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, &amp;Version, &amp;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); } } </code></pre> <p>In Windows XP, it hits memory access violation trying to access something behind <code>NULL</code> pointer.</p> <pre><code> 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 &gt; InternetQueryOption.exe!main(int argc=1, char * * argv=0x003e2e60) Line 55 C++ InternetQueryOption.exe!__tmainCRTStartup() Line 278 C </code></pre>
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    1. PTQuestion
    1. USRoman R.
    1. USWolfgang Ziegler
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      1. POInternetQueryOption crashes on Windows XP
      1. USRoman R.
      1. VTFavorite
    2. VO
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      1. VTUpMod
    1. COWhat kind of crash - memory access violation, error code, call stack, anything?
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      1. USRoman R.
    2. COAccess violation - thanks for the feedback. I updated the question.
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      1. POInternetQueryOption crashes on Windows XP
      1. USWolfgang Ziegler
    3. COWith access violation you should set debugger up to break on exception, and examine call stack (and paste it here). You will see chain on functions on the stack and this is relevant information. For us here it is more of a guess work. I, for instance, don't like the line `printf("%s\n", Option[0].Value.pszValue);` because it looks like you are printing a string from uninitialized location.
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      1. POInternetQueryOption crashes on Windows XP
      1. USRoman R.
 

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