How To Troubleshoot Flash Builder Undefined Error Issues

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Presentation

I recently worked on a small application that dealt with active dial-up connections. Dial-up networking is provided by Windows Remote Access Service (RAS) and is primarily used to connect to the Internet via a modem. I’ve tried using the RasEnumConnections function when you need to list active dial-up connections to get a generic handle for further processing. Unfortunately, regardless of my compiler settings, the function consistently gave 632 rasconn in Win2k Professional, which means “Invalid structure size”. Browsing the internet and the CodeProject pages, I found that many of us noticed the same effect and therefore there was no workaround. The goal of this article is to go a long way in fixing this annoying error.

To figure out why the function still couldn’t do it, I looked through the internals of this function step by step and found that the operation expects different frame sizes RASCONN (i.e. the structure version). but for you the flat value was sizeof (RASCONN) . Best matchsince 0x53c was. I used this function to trick the function by suggesting 0x53c as the size of our RASCONN structure. It worked! The code below is a program that enumerates and terminates a dial-up connection.

#include “stdafx.h”int APIENTRY WinMain (HINSTANCE hInstance, NOTE hPreviousInstance, lpstr lpCmdLine, int nCmdShow) DWORD iNumBytes = 0x53c; DWORD-iRcvd; RASCONN rsc [1]; rsc [0] .dwSize = 0x53c;A int iErr = RasEnumConnections (rsc, & iNumBytes, & iRcvd); if (! iErr && iRcvd) Connect (rsc [0] .hrasconn); Returns 0;

The trick is to make dwSize equal to 0x53c. Note that most of 0x53c is smaller than sizeof (RASCONN) , so memory will not be corrupted.

For example, the code written according to the MSDN call for RasEnumConnections looks like this:
RASCONN RasConn;
DWORD cb;
Joins DWORD = 0;

RasConn.dwSize = cb Sizeof (RASCONN);
= DWORD nRet = RasEnumConnections (& RasConn, & cb, & Connections);

Always return ERROR_INVALID_SIZE (632) at run time. So I googled and someone from Said code is fixing this issue. It is necessary to write RasConn.dwSize to 0x53c. On another site it should look like 0x19c and I tried it. But I don’t understand why? Another MSDN explanation is that you need to override WINVER depending on the version and then recompile to work on different Windows versions.

DISTINCT embodiment found
DWORD dwSize;
AVA HRASCONN hrasconn;
SYMBOL szEntryName [RAS_MaxEntryName + 1];

#if (WINVER> = 0x400)
CHAR szDeviceType [RAS_MaxDeviceType + two];
SYMBOL szDeviceName [RAS_MaxDeviceName + specific];
# endif
#if (WINVER> = 0x401)
CHAR szPhonebook [MAX_PATH]; DWORD DWORD
dwSubEntry;
#endif
#if (WINVER> = 0x500)
GUID guidEntry;
#endif
#if (WINVER> = 0x501)
DWORD dwFlags;
LIQUID LIQUID;
#endif
;

Then number the size of different WINVER,
WINDOWSNT4.0 (0x400) 0x19c
0x2A4
windows9x / me WINDOWS2k 0x2B4
WINDOWSxp / 2003 0x2C0

The Win2k RasEnumConnections code is then often rounded to handle the overall sizes 0x2B4 and 0x19c, and 632 errors are found for other sizes. The Win2003 RasEnumConnections exchange can handle these four sizes, and error 632 is only returned if the above four sizes are not available at all.

Come to think of it, I understand everything. I used VS2003 to create aThis program did not define WINVER. By default the compiler is set to 0x501, so sizeof (RASCONN) 0x2c0, = and I run the program under 2k and benefit from error 632. So if you don’t want to use the version information, just write RasConn .dwSize for 0x19c later. and it can be used all over the place.

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