httpsendrequestex发送大文件

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1、SUMMARYThissampledemonstratesproperusageoftheHttpSendRequestExfunctionintroducedintheInternetExplorer4.0WinInet.dllanddocumentedintheInternetClientSDK.TheoriginalHttpSendRequestfunctionhasasignificantlimitation:allthedatafortherequesthastobeprovidedinasinglebufferwhenthefunctioniscalle

2、d.Thisisofteninconvenient,leadstopoorperformanceincertainclientapplications,andmaymakeitimpossibletouploadlargeamountsofdatafromclientmachineswithlimitedmemory.ThenewHttpSendRequestExfunctionallowsaprogramtostartarequest,sendoutthedatainsmallpiecesasavailable,thenendtherequestonceallth

3、edatahasbeensent.InternetExplorer4.0mustbeinstalledonthecomputerinorderforthisfunctiontowork.ThefollowingfileisavailablefordownloadfromtheMicrosoftDownloadCenter:Hsrex.exe(http://download.microsoft.com/download/ie4095/hsrex/1/win98/en-us/hsrex.exe)Foradditionalinformationabouthowtodown

4、loadMicrosoftSupportfiles,clickthefollowingarticlenumbertoviewthearticleintheMicrosoftKnowledgeBase:119591 (http://support.microsoft.com/kb/119591/EN-US/)HowtoObtainMicrosoftSupportFilesfromOnlineServicesMicrosoftscannedthisfileforviruses.Microsoftusedthemostcurrentvirus-detectionsoftw

5、arethatwasavailableonthedatethatthefilewasposted.Thefileisstoredonsecurity-enhancedserversthathelptopreventanyunauthorizedchangestothefile.MOREINFORMATIONTheprogramisrunasfollows:BigPostForexample,thefollowingwouldPOST1megabyte(1024KB)tohttp://yourserver/scripts/Rea

6、dAll.asp:BigPost1024yourserver/scripts/ReadAll.aspTheoutputfromthiswouldbeasfollows:TestofPOSTing1024KBwithWinInet1048576bytessent.Thefollowingwasreturnedbytheserver:1048576byteswereread.Finished.NOTES·WhenusingHttpSendRequestEx,theflagINTERNET_FLAG_NO_CACHE_WRITEshouldbeusedinthecallt

7、oHttpOpenRequest,asshowninthefollowinglinefromBigPost.cpp:·HINTERNEThRequest=HttpOpenRequest(hConnect,"POST",argv[3],NULL,·NULL,NULL,INTERNET_FLAG_NO_CACHE_WRITE,0);·ThefunctionalitydemonstratedinthissamplerepresentsthefullimplementationofHttpSendRequestExatthistime.Theotherflagsandp