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POHow To Get DeleteUrlCacheEntry() Error Codes? (Or additional information on why a particular deletion didn't work)?
 

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  1. POHow To Get DeleteUrlCacheEntry() Error Codes? (Or additional information on why a particular deletion didn't work)?
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    <p>Basically, when I call DeleteUrlCacheEntry (which is part of the Wininet.dll API) I either get returned the number 1 (which means, deletion successful) or the number 0 (which meant, deletion didn't work).</p> <p>My question is, how can I find out why a deletion did not work? (that is, when a 0 is returned). I heard there is a GetLastError() function in C++, however I am using VB6 and apparently the GetLastError equivalent in VB6 is the Err.LastDllError property.</p> <p>After a DeleteUrlCacheEntry attempted deletion fails (returns 0) I call/query the Err.LastDllError and it always returns 0 - no matter what. It returns 0 even if DeleteUrlCacheEntry returns 0 (deletion didn't work) and even when it returns 1 (deletion did work). I also make the call/query to Err.LastDllError as soon as possible (as in, right after the DeleteUrlCacheEntry call).</p> <p>I am really confused, because I don't even get a runtime error or any typical exception (or any exception for that matter). I do not have On Error Resume Next to ignore exception anywhere in my application, so every means of an error being reported to me is available but I cannot for the life of me figure out why a particular DeleteUrlCacheEntry() attempt will fail and return 0 (there doesn't seem to be a way for me to find out).</p> <p>So, my question is, how do I get extended error information from the DeleteUrlCacheEntry() function (residing in the wininet.dll API)?</p> <p>If you would like more information on the reason why I am looking for extended error information from the DeleteUrlCacheEntry() function, I have another question which details this (together with actual examples of cache items that work and don't work when a deletion is attempted): <a href="https://stackoverflow.com/questions/12096546/deleteurlcacheentry-function-of-wininet-api-not-deleting-some-internet-explo">https://stackoverflow.com/questions/12096546/deleteurlcacheentry-function-of-wininet-api-not-deleting-some-internet-explo</a></p> <p>Also, just to add, I am using VB6 - but principally it should be the same across most languages as it is an API call. Here is my declaration in VB6:</p> <blockquote> <p>Public Declare Function DeleteUrlCacheEntry Lib "WININET" Alias "DeleteUrlCacheEntryA" (ByVal lpszUrlName As String) As Long</p> </blockquote> <p>Also, I am calling it like this:</p> <blockquote> <p>Dim lReturnValue As Long</p> <p>Dim cacheFileString As String</p> <p>' GetStrFromPtrA turns Pointer (Long) to String. cacheFileString is the actual text/string of the lpszSourceUrlName turned from Pointer (Long) to String (human readable cache file name/string). Also, cacheFileString is retreived from FindFirst/NextEntry functions in a loop, so can't be incorrectly formatted or anything, as it also works when deleting most other items.</p> <p>cacheFileString = GetStrFromPtrA(icei.lpszSourceUrlName)</p> <p>lReturnValue = DeleteUrlCacheEntry(cacheFileString)</p> </blockquote> <p>The lReturnValue ends up being 0 if deletion didn't work, and 1 when deletion does work, and that is it. Also, <code>Err.LastDllError</code> always returns 0.</p> <p>Thank you for your anticipated assistance.</p>
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    1. CO@KenWhite The reason for the tags is because it applies to both C++ and Delphi as well (usage scenario is the same since it's a wininet.dll api call with error codes usually residing in a c++ .h file. So, it applies to people using these languages and those using these languages will also be able to make a contribution to this post.
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      1. POHow To Get DeleteUrlCacheEntry() Error Codes? (Or additional information on why a particular deletion didn't work)?
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    2. CO@KenWhite it is not random, this is not a "code" issue just because some people wanted to see the code, it is an error codes issue, which applies to Delphi and C++ especially, notice i didn't include javascript, .NET or Java! Those would be random tags! API is universal across many languages which can hook into the Windows API, such as delphi and C++, which is why I seek the support of those people (getting extended error codes using API, not VB6-specific code). This is why people who are not closely involved in understanding the question should not edit tags or suggest close/delete etc.
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      1. POHow To Get DeleteUrlCacheEntry() Error Codes? (Or additional information on why a particular deletion didn't work)?
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    3. COYou can call API functions from assembler, too; that doesn't make it an assembly question. And I'm quite familiar, thank you - I'm not exactly new here, if you view my profile and the tags for which I've answered questions. :-)
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      1. USKen White
 

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