如何获取与清除IE历史记录

一、主要用到了COM组件提供的接口实现，几个接口包括：
1、IUrlHistoryStg、IUrlHistoryStg2(IUrlHistoryStg2接口继承自IUrlHistoryStg)
2、IEnumSTATURL
下面接口信息摘自MSDN
IUrlHistoryStg Interface

This interface manages Microsoft Internet Explorer history for the current user.

IUrlHistoryStg Members

AddUrl	Places the specified URL into the history. If the URL does not exist in the history, an entry is created in the history. If the URL does exist in the history, it is overwritten.
BindToObject	Not currently implemented.
DeleteUrl	Deletes all instances of the specified URL from the history.
EnumUrls	Returns an interface to an enumerator of the history's visited links.
QueryUrl	Queries the history and reports whether the URL passed as thepocsUrlparameter has been visited by the current user.

InterfaceInformation

Stock Implementation Custom Implementation Inherits from Header and IDL files Minimum availability Minimum operating systems

shdocvw.dll

No

IUnknown

urlhist.h,urlhist.idl

Internet Explorer 5.5

Millennium, Windows2000

IUrlHistoryStg2 Interface

---

This interface provides additional features for managing the user's history.

IUrlHistoryStg2 Members

AddUrlAndNotify	Provides an advanced method of adding a URL to the history.
ClearHistory	Clears history on a per-user basis.

InterfaceInformation

Stock Implementation Custom Implementation Inherits from Header and IDL files Minimum availability Minimum operating systems

shdocvw.dll

No

IUrlHistoryStg

urlhist.h,urlhist.idl

Internet Explorer 5.5

Millennium, Windows2000

IEnumSTATURL Interface

---

This interface enumerates the items in the history cache.

IEnumSTATURL Members

Clone	Not currently implemented.
Next	Searches the history for any URL that matches the search pattern and copies it to the specified buffer.
Reset	Resets the enumerator interface so that it begins enumerating at the beginning of the history.
SetFilter	IEnumSTATURL::Nextcompares the specified URL with each URL in the history list to find matches.IEnumSTATURL::Nextthen copies the list of matches to a buffer. This method is used to specify the URL to compare.
Skip	Not currently implemented.

InterfaceInformation

Stock Implementation Custom Implementation Inherits from Header and IDL files Minimum availability Minimum operating systems

shdocvw.dll

No

IUnknown

urlhist.h,urlhist.idl

Internet Explorer 5.5

Millennium, Windows2000

二、用到的接口中的相关方法：
1、IUrlHistoryStg::EnumUrls

IUrlHistoryStg::EnumUrlsMethod
Returnsaninterfacetoanenumeratorofthehistory'svisitedlinks.
Syntax
HRESULTEnumUrls(IEnumSTATURL**ppEnum);
Parameters
ppEnum：[out]Pointerthatreceivesapointertotheinterfacetoahistoryenumerator.
ReturnValue
ReturnsS_OKifsuccessful,oranerrorvalueotherwise.

2、IEnumSTATURL::Next

LRESULTIEnumSTATURL::Next(ULONGcelt,LPSTATURLrgelt,ULONG*pceltFetched)
参数说明：
celt意义不明，不能为0，可以将其设为1。
Rgelt是STATURL结构指针，该结构由MS-IE填充。
PceltFetched由方法返回，返回1表示rgelt结构被成功填充了。若要用到第二参数内的数据，应该判断该值是否为1。

其中结构STATURL定义如下

STATURLStructure
ContainsstatisticsaboutaURL.ThisstructureisfilledbyMicrosoftInternetExplorerduringcallstoIUrlHistoryStg::QueryUrlandIEnumSTATURL::Next.

Syntax

typedefstruct_STATURL...{
DWORDcbSize;
LPWSTRpwcsUrl;
LPWSTRpwcsTitle;
FILETIMEftLastVisited;
FILETIMEftLastUpdated;
FILETIMEftExpires;
DWORDdwFlags;
}STATURL,*LPSTATURL;

Members

cbSize
DWORDthatshouldbesettosizeof(STATURL).
pwcsUrl
ThespecifiedURL.Thecallingfunctionmustfreethisparameter.SetthisparametertoSTATURL_QUERYFLAG_NOURLifnoURLisspecified.
pwcsTitle
ThetitleoftheWebpage,ascontainedinthetitletags.Thiscallingapplicationmustfreethisparameter.SetthisparametertoSTATURL_QUERYFLAG_NOTITLEifnoWebpageisspecified.
ftLastVisited
Thelasttimetheuservisitedthispage.
ftLastUpdated
Thelasttimethepagewasupdated.
ftExpires
TheexpirydateoftheWebpage'scontent.
dwFlags
DWORDthatcanbeeitherSTATURL_QUERYFLAG_ISCACHEDorSTATURL_QUERYFLAG_TOPLEVEL.

三、代码实现(VC6.0+Windows XP)

#include<stdio.h>
#include<windows.h>
#include<UrlHist.h>//IUrlHistoryStg2
#include<shlobj.h>//CLSID_CUrlHistory,SHAddToRecentDocs
#include<atlbase.h>//USES_CONVERSION;

voidGetIEHistory()
...{
USES_CONVERSION;//Unicode转Ansi用
CoInitialize(NULL);//初始化

IUrlHistoryStg2*pUrlHistoryStg2=NULL;
HRESULThr=CoCreateInstance(CLSID_CUrlHistory,
NULL,CLSCTX_INPROC,IID_IUrlHistoryStg2,
(void**)&pUrlHistoryStg2);

/**//*if(SUCCEEDED(hr))
{
hr=pUrlHistoryStg2->ClearHistory();
pUrlHistoryStg2->Release();
}*/

IEnumSTATURL*pEnumURL;
hr=pUrlHistoryStg2->EnumUrls(&pEnumURL);

STATURLsuURL;
ULONGpceltFetched;
suURL.cbSize=sizeof(suURL);
hr=pEnumURL->Reset();

while((hr=pEnumURL->Next(1,&suURL,&pceltFetched))==S_OK)
...{
//hr=pUrlHistoryStg2->DeleteUrl(suURL.pwcsUrl,0);
printf("%s",W2T(suURL.pwcsUrl));
}

pEnumURL->Release();
pUrlHistoryStg2->Release();
CoUninitialize();
}