如何获取(清除)IE缓存地址信息

一、主要用到以下几个API：
1、FindFirstUrlCacheEntry
2、FindNextUrlCacheEntry
3、FindCloseUrlCache
下面的内容摘自MSDN：
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FindFirstUrlCacheEntry

Begins the enumeration of the Internet cache.

HANDLE FindFirstUrlCacheEntry( LPCTSTR lpszUrlSearchPattern, LPINTERNET_CACHE_ENTRY_INFO lpFirstCacheEntryInfo, LPDWORD lpcbCacheEntryInfo);

Parameters

lpszUrlSearchPattern

[in] A pointer to a string that contains the source name pattern to search for. This parameter can only be set to "cookie:", "visited:", or NULL. Set this parameter to "cookie:" to enumerate the cookies or "visited:" to enumerate the URL History entries in the cache. If this parameter is NULL, FindFirstUrlCacheEntryreturns all content entries in the cache.

lpFirstCacheEntryInfo

[out] Pointer to an INTERNET_CACHE_ENTRY_INFOstructure.

lpcbCacheEntryInfo

[in, out] Pointer to a variable that specifies the size of the lpFirstCacheEntryInfobuffer, in TCHARs. When the function returns, the variable contains the number of TCHARscopied to the buffer, or the required size needed to retrieve the cache entry, in TCHARs.

Return Value

Returns a handle that the application can use in the FindNextUrlCacheEntryfunction to retrieve subsequent entries in the cache. If the function fails, the return value is NULL. To get extended error information, call GetLastError.

ERROR_INSUFFICIENT_BUFFER indicates that the size of lpFirstCacheEntryInfoas specified by lpdwFirstCacheEntryInfoBufferSizeis not sufficient to contain all the information. The value returned in lpdwFirstCacheEntryInfoBufferSizeindicates the buffer size necessary to contain all the information.

Remarks

FindFirstUrlCacheEntryand FindNextUrlCacheEntryreturn variable size information. If ERROR_INSUFFICIENT_BUFFER is returned, the application should allocate a buffer of the size specified by lpdwFirstCacheEntryInfoBufferSize. For more information, see Using Buffers.

Requirements

Client	Requires WindowsVista, WindowsXP, Windows2000 Professional, WindowsNT Workstation4.0, WindowsMe, Windows98, or Windows95.
Server	Requires Windows Server"Longhorn", Windows Server2003, Windows2000 Server, or WindowsNT Server4.0.
Version	Requires Internet Explorer 3.0 or later.
Header	Declared in Wininet.h.
Library	Use Wininet.lib.
DLL	Requires Wininet.dll.
Unicode	Implemented as FindFirstUrlCacheEntryW(Unicode) and FindFirstUrlCacheEntryA(ANSI). Note that Unicode support on Windows Me/98/95 requires Microsoft Layer for Unicode.

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FindNextUrlCacheEntry

Retrieves the next entry in the Internet cache.

BOOLAPI FindNextUrlCacheEntry( HANDLE hEnumHandle, LPINTERNET_CACHE_ENTRY_INFO lpNextCacheEntryInfo, LPDWORD lpcbCacheEntryInfo);

Parameters

hEnumHandle

[in] Handle to the enumeration obtained from a previous call to FindFirstUrlCacheEntry.

lpNextCacheEntryInfo

[out] Pointer to an INTERNET_CACHE_ENTRY_INFOstructure that receives information about the cache entry.

lpcbCacheEntryInfo

[in, out] Pointer to a variable that specifies the size of the lpNextCacheEntryInfobuffer, in TCHARs. When the function returns, the variable contains the number of TCHARscopied to the buffer, or the size of the buffer required to retrieve the cache entry, in bytes.

Return Value

Returns TRUEif successful, or FALSEotherwise. To get extended error information, call GetLastError. Possible error values include the following.

Return code	Description
ERROR_INSUFFICIENT_BUFFER	The size of lpNextCacheEntryInfoas specified by lpdwNextCacheEntryInfoBufferSizeis not sufficient to contain all the information. The value returned in lpdwNextCacheEntryInfoBufferSizeindicates the buffer size necessary to contain all the information.
ERROR_NO_MORE_ITEMS	The enumeration completed.

Remarks

FindNextUrlCacheEntryis called recursively until the last item in the cache is returned. The handle returned from FindFirstUrlCacheEntryis used in all subsequent calls to FindNextUrlCacheEntry.

Requirements

Client	Requires WindowsVista, WindowsXP, Windows2000 Professional, WindowsNT Workstation4.0, WindowsMe, Windows98, or Windows95.
Server	Requires Windows Server"Longhorn", Windows Server2003, Windows2000 Server, or WindowsNT Server4.0.
Version	Requires Internet Explorer 3.0 or later.
Header	Declared in Wininet.h.
Library	Use Wininet.lib.
DLL	Requires Wininet.dll.
Unicode	Implemented as FindNextUrlCacheEntryW(Unicode) and FindNextUrlCacheEntryA(ANSI). Note that Unicode support on Windows Me/98/95 requires Microsoft Layer for Unicode.

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FindCloseUrlCache

This function closes the specified cache enumeration handle.

BOOL FindCloseUrlCache( HANDLE hEnumHandle );

Parameters

hEnumHandle

[in] Handle returned by a previous call to theFindFirstUrlCacheEntryfunction.

Return Values

Returns TRUE if successful, or FALSE otherwise.

Requirements

OS Versions:Windows CE 2.12 and later.
Header:Wininet.h.
Link Library:Wininet.lib.

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DeleteUrlCacheEntry

This function removes the file associated with the source name from the cache, if the file exists.

BOOL DeleteUrlCacheEntry( LPCTSTR lpszUrlName );

Parameters

lpszUrlName

[in] Address of a string variable that contains the cache entry source name. The name string must be unique and cannot contain escape characters.

Return Values

Returns TRUE if successful, or FALSE otherwise.

Requirements

OS Versions:Windows CE 2.12 and later.
Header:Wininet.h.
Link Library:Wininet.lib.

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INTERNET_CACHE_ENTRY_INFO

Contains information about an entry in the Internet cache.

typedef struct _INTERNET_CACHE_ENTRY_INFO {
DWORD dwStructSize;
LPTSTR lpszSourceUrlName;
LPTSTR lpszLocalFileName;
DWORD CacheEntryType;
DWORD dwUseCount;
DWORD dwHitRate;
DWORD dwSizeLow;
DWORD dwSizeHigh;
FILETIME LastModifiedTime;
FILETIME ExpireTime;
FILETIME LastAccessTime;
FILETIME LastSyncTime;
LPBYTE lpHeaderInfo;
DWORD dwHeaderInfoSize;
LPTSTR lpszFileExtension;
union {
DWORD dwReserved;
DWORD dwExemptDelta;
}; } INTERNET_CACHE_ENTRY_INFO,
*LPINTERNET_CACHE_ENTRY_INFO;

Members

dwStructSize

Size of this structure, in bytes. This value can be used to help determine the version of the cache system.

lpszSourceUrlName

Pointer to a null-terminated string that contains the URL name. The string occupies the memory area at the end of this structure.

lpszLocalFileName

Pointer to a null-terminated string that contains the local file name. The string occupies the memory area at the end of this structure.

CacheEntryType

A bitmask indicating the type of cache entry and its properties. The cache entry types include: history entries (URLHISTORY_CACHE_ENTRY), cookie entries (COOKIE_CACHE_ENTRY), and normal cached content (NORMAL_CACHE_ENTRY).

This member can be zero or more of the following property flags, and cache type flags listed below.

Value	Meaning
EDITED_CACHE_ENTRY	Cache entry file that has been edited externally. This cache entry type is exempt from scavenging.
SPARSE_CACHE_ENTRY	Partial response cache entry.
STICKY_CACHE_ENTRY	Sticky cache entry that is exempt from scavenging for the amount of time specified by dwExemptDelta. The default value set by CommitUrlCacheEntryis one day.
TRACK_OFFLINE_CACHE_ENTRY	Not currently implemented.
TRACK_ONLINE_CACHE_ENTRY	Not currently implemented.

The following list contains the cache type flags.

Value	Meaning
COOKIE_CACHE_ENTRY	Cookie cache entry.
NORMAL_CACHE_ENTRY	Normal cache entry; can be deleted to recover space for new entries.
URLHISTORY_CACHE_ENTRY	Visited link cache entry.

dwUseCount

Current user count of the cache entry.

dwHitRate

Number of times the cache entry was retrieved.

dwSizeLow

Low-order portion of the file size, in TCHARs.

dwSizeHigh

High-order portion of the file size, in TCHARs.

LastModifiedTime

FILETIMEstructure that contains the last modified time of this URL, in Greenwich mean time format.

ExpireTime

FILETIMEstructure that contains the expiration time of this file, in Greenwich mean time format.

LastAccessTime

FILETIMEstructure that contains the last accessed time, in Greenwich mean time format.

LastSyncTime

FILETIMEstructure that contains the last time the cache was synchronized.

lpHeaderInfo

Pointer to a buffer that contains the header information. The buffer occupies the memory at the end of this structure.

dwHeaderInfoSize

Size of the lpHeaderInfobuffer, in TCHARs.

lpszFileExtension

Pointer to a string that contains the file extension used to retrieve the data as a file. The string occupies the memory area at the end of this structure.

dwReserved

Reserved. Must be zero.

dwExemptDelta

Exemption time from the last accessed time, in seconds.

Remarks

There is no cache entry size limit, so applications that need to enumerate the cache must be prepared to allocate variable-sized buffers. For more information, see Using Buffers.

Requirements

Client	Requires WindowsVista, WindowsXP, Windows2000 Professional, WindowsNT Workstation4.0, WindowsMe, Windows98, or Windows95.
Server	Requires Windows Server"Longhorn", Windows Server2003, Windows2000 Server, or WindowsNT Server4.0.
Version	Requires Internet Explorer 3.0 or later.
Header	Declared in Wininet.h.
Unicode	Implemented as INTERNET_CACHE_ENTRY_INFOW(Unicode) and INTERNET_CACHE_ENTRY_INFOA(ANSI). Note that Unicode support on Windows Me/98/95 requires Microsoft Layer for Unicode.

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二、代码实现

#include<stdio.h>
#include<windows.h>
#include<wininet.h>

//获取IE上网缓存信息。如Cookie信息、Visited网址信息等
BOOLGetIECache()
{
intcount=0;
HANDLEhCacheEnumHandle=NULL;
LPINTERNET_CACHE_ENTRY_INFOlpCacheEntry=NULL;
DWORDdwSize=4096;

lpCacheEntry=(LPINTERNET_CACHE_ENTRY_INFO)newchar[dwSize];
lpCacheEntry->dwStructSize=dwSize;


//URLsearchpattern(1stparameter)optionsare:NULL("*.*"),"cookie:",
//or"visited:".
hCacheEnumHandle=FindFirstUrlCacheEntry(
"visited:",lpCacheEntry,&dwSize);

if(hCacheEnumHandle!=NULL)
{
printf("%s",lpCacheEntry->lpszSourceUrlName);
}
else
{
switch(GetLastError())
{
caseERROR_INSUFFICIENT_BUFFER:
lpCacheEntry=(LPINTERNET_CACHE_ENTRY_INFO)newchar[dwSize];
lpCacheEntry->dwStructSize=dwSize;

//Repeatfirststepsearchwithadjustedbuffer,exitifnot
//foundagain(inpracticeonebuffer'ssizeadustmentis
//alwaysOK).
hCacheEnumHandle=FindFirstUrlCacheEntry("visited:",lpCacheEntry,
&dwSize);
if(hCacheEnumHandle!=NULL)
{
count++;
printf("%d:%s",count,lpCacheEntry->lpszSourceUrlName);
break;
}
else
{
//FindFirstUrlCacheEntryfailsagain,return.
returnFALSE;
}
default:
{
FindCloseUrlCache(hCacheEnumHandle);
returnFALSE;
}
}
}

do
{
//NoticethatreturnvaluesofFindNextUrlCacheEntry(BOOL)and
//FindFirstUrlCacheEntry(HANDLE)aredifferent.
if(FindNextUrlCacheEntry(hCacheEnumHandle,lpCacheEntry,&dwSize))
{
count++;
printf("%d:%s",count,lpCacheEntry->lpszSourceUrlName);
}
else
{
switch(GetLastError())
{
caseERROR_INSUFFICIENT_BUFFER:
lpCacheEntry=
(LPINTERNET_CACHE_ENTRY_INFO)newchar[dwSize];
lpCacheEntry->dwStructSize=dwSize;

//Repeatnextstepsearchwithadjustedbuffer,exitif
//errorcomesupagain((inpracticeonebuffer'ssize
//adustmentisalwaysOK).
if(FindNextUrlCacheEntry(hCacheEnumHandle,lpCacheEntry,
&dwSize))
{
count++;
printf("%d:%s",count,lpCacheEntry->lpszSourceUrlName);
break;
}
else
{
//FindFirstUrlCacheEntryfailsagain,return.
FindCloseUrlCache(hCacheEnumHandle);
returnFALSE;
}
break;
caseERROR_NO_MORE_ITEMS:
FindCloseUrlCache(hCacheEnumHandle);
returnTRUE;
default:
FindCloseUrlCache(hCacheEnumHandle);
returnFALSE;
}
}
}while(TRUE);
}