EhLib 5 Developers guide 官方开发手册Word文档下载推荐.docx

EhLib 5 Developers guide 官方开发手册Word文档下载推荐.docx

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TDBGridEhcomponent

UsingTDBGridEh

ItprovidesallfunctionalityofTDBGridandaddsseveralnewfeaturesasfollows:

-Allowstoselectrecords,columnsandrectangleareas.

-Providesspecialtitlesthatcancoverseveralorallcolumns.

-Canhaveafooterthatisabletoshowsum/count/otherfieldvalues.

-Allowstoresizecolumnautomaticallytofitgridwidthequaltoclientwidth.

-Hasanabilitytochangerowheightandtitleheight.

-Allowsautomaticbrokenofasinglelinelongtitleanddatarowstoamultiline.

-Allowstitletoactasbuttonand,optionallyshowasortmarker.

-AllowstomarktitlesbysortmarkingsingsautomaticallyandsortdatainDataSet.

-Allowstotruncatelongtextwithellipsisincells.

-Allowslookuplisttoshowseveralfields.

-Haveanabilitytomakeanincrementalsearchinlookupfields.

-Canhavefrozennonscrollablecolumns.

-AllowstoshowDateTimepickerforTDateFieldandTDateTimeField.

-AllowstoshowbitmapsfromTImageListdependingonfieldvalue.

-Allowstohideandtrackhorizontalorverticalscrollbars.

-Allowstohidecolumns.

-Allowstoshow3Dframeforfrozen,footeranddatarows.

-Allowstodrawmemofields.

-Canshowmultilineinplaceeditor.

-CanhaveaproportionalscrollingforDadaSetsindependentlyofdataset’ssequencing.

-AllowstoshowcheckboxesautomaticallyforBooleanfields.Allowstoshowcheckboxesforothertypeoffields.

-Hasprocedurestosaveandrestorelayout（visiblecolumns,columnsorder,columnswidth,sortmarkers,rowheight）in/fromregistryorinifile.

-Allowstoshowhint（ToolTips）fortextthatdon'

tfitinthecell.

-AllowstoexportdatatoText,Csv,HTML,RTF,XLSandinternalformats.

-AllowstoimportdatafromTextandinternalformats.

-Cansortdatainvariousdatasets.

-Canfilterdatainvariousdatasets.

TDBLookupComboboxEhcomponent

Usingeditcontrols

ItprovidesallfunctionalityofTDBLookupComboboxandaddsseveralnewfeaturesasfollows:

-Canhaveflatstyle. 

-AllowstoassignvaluesastoKeyValuepropertyandastodisplayTextproperty.

-AllowstoholdKeyValueandTextthatwillnotaffecttoeachothersvalues.

Dropdownlistcan:

-Showtitles, 

-Havesizinggrip,

-AutomaticallysetwidthassumofDisplayWidthofthelistfields（Width=-1）,

-Automaticallydropswhentheuserpressedthekey.

-Canhavespecifiedwidth.

Editbuttoncan:

-ShowDropDownandEllipsisorBitmapimage.

Haveadditionalevents:

OnKeyValueChangedandOnButtonClick.

TDBSumListcomponent

UsingTDBSumList

ItisintendedforcalculatingsumsandamountofrecordsinaTDataSetwithdynamicchanges.ComponentkeepsalistofTDBSumobjects,whichcontainstypesofgroupoperations（goSumorgoCount）andnameoffieldswhichvaluesneedsomecalculation.（goCountnameoffieldisunnecessary）.

TPrintDBGridEhcomponent

UsingTPrintDBGridEh

TPrintDBGridEhprovidespropertiesandroutinesforpreviewandprintofTDBGridEhcomponentwithseveralfeatures:

-Abilitytoexpandrowsverticallyuntilalltextisprinted.

-Abilitytoscalegridtofitittothepagewidth.

-Abilitytoprint/previewtitleforgrid.

-Abilitytoprint/previewpageheaderandpagefooterwhereyoucanspecifymacrosforcurrentpage,currentdate,currenttimeand/orstatictext.

-Automaticallyprint/previewmulti-selectedareaofTDBGridEhifit’sareaisnotempty.

-Abilitytoprint/previewrichtextbeforeandaftergrid.

TPreviewBoxcomponent

TPreviewBoxletsyoutocreateacustomizableruntimepreview.

TPrinterPreviewobject

TPrinterPreviewletsyoutorecordprintabledatainbufferforfollowingoutputthemonscreenandtoprinter.TPrinterPreviewhaveallfunctionsandpropertiesasinTPrinterobject.YoucanuseTPrinterPreviewobjectsimilarlytoTPrinterexceptsomedetails.InTPrinterPrinter.Canvas.HandleandPrinter.HandleisthesamebutinTPrinterPreviewPrinterPreview.Canvas.HandlerepresentsthemetafileinthatisrecoredthedataandPrinterPreview.HandlerepresentsPrinter.Handle.ItmeansthatyouhavetousePrinterPreview.Canvas.Handlefordrawingoperation（likeDrawText,DrawTexteEx,e.t.c.）andusePrinterPreview.Handleforsuchfunctionsasreturninginformationaboutprinterfacilities（GetDeviceCaps,e.t.c.）.GlobalfunctionPrinterPreviewreturnsdefaultPrinterPreviewobjectandshowsdatainthedefaultpreviewform.

TDBEditEhcomponent

representsasingleormulti-lineeditcontrolthatcandisplayandeditdataoffieldinadatasetorcanworkasnondata-awareeditcontrol.

TDBDateTimeEditEhcomponent

representsasingle-linedateortimeeditcontrolthatcandisplayandeditdataofTDateTimefieldsindatasetorcanworkasanondata-awareeditcontrol.

TDBComboBoxEhcomponent

representsasingleormulti-lineeditcontrolthatcombinesaneditboxwithascrollablelistandcandisplayandeditafieldinadatasetorcanworksasnondata-awarecomboeditcontrol.

TDBNumberEditEhcomponent

representsasingle-linenumbereditcontrolthatcandisplayandeditanumericfieldinadatasetorcanworkasnondata-awareeditcontrol.

TPropStorageEh,TIniPropStorageManEh,TRegPropStorageManEhcomponentsUsingTPropStorageEh 

Thesecomponentsrealizeatechnologyofstoringcomponentpropertiesto/fromsuchstoragesasINIfiles,Registryetc.

TMemTableEhcomponent

ItisadatasetthatholdsalldatainmemoryandcangetdatafromTDataDriverEhandreturnchangedrecordsbacktotheTDataDriverEh.

TDataDriverEhcomponent

DeliverrecordsfromtheservertotheTMemTableEh.

DeliverchangedrecordsfromTMemTableEhbacktotheserver.

TDataSetDriverEhcomponent

ItisaDataDriverthatdeliverrecordsinTMemTableEhfromotherDataSetanddeliverchangedrecordsfromTMemTableEhbacktotheDataSet.

TSQLDataDriverEhcomponent

ItisaDataDriverthathavepropertiesforkeepingfiveSQLexpressionsandparametersforqueryingdata,removing,insertions,updatingandrefreshingrecords.TSQLDataDriverEhbyitselfcan’trequestdatafromserver,butitcanprepareparametersoftherequestandhaveaglobaleventthatprogrammercanwritefortransferringSQLexpressionto/fromtheserver.

TBDEDataDriverEhcomponent

ItisaDataDriverthatinteractswiththeDBserverusingBDEconnection.

TIBXDataDriverEhcomponent

ItisaDataDriverthatinteractswiththeDBserverusingIBXconnection.

TDBXDataDriverEhcomponent

ItisaDataDriverthatinteractswiththeDBserverusingDBXconnection.

TADODataDriverEhcomponent

ItisaDataDriverthatinteractswiththeDBserverusingADOconnection.

Installation

BelowitwillbedescribedhowtoinstallEhLibunderDelphi6.

UninstallpreviousorevaluationversionofEhLibfromDelphi6IDE.

RemoveorcopythisfilestootherdirectorythisfilestopreventcrossingthisandnewversionofEhLib（IncludingEhLib.bpl,EhLib.dcp,EhLibXX.bpl,EhLibXX.dcpfiles）.

Unpackingarchive

UnpackEhLibarchive.

Afterunpackingyouwillhavenextlistofdirectories:

Directoriesof'

EhLib-sourceinclude'

version:

BCB5

ContainsourcefileswhicharespecificforC++Builder5.

BCB6

ContainsourcefileswhicharespecificforC++Builder6.

Common

ContainsourcefileswhicharecommonforallversionsofDelphiandC++Builder.

Delphi5

ContainsourcefileswhicharespecificforDelphi5.

Delphi6

ContainsourcefileswhicharespecificforDelphi6.

Delphi7

ContainsourcefileswhicharespecificforDelphi7.

DEMOS

Demonstrationprojects.ItusetablesfromtheDEMOSdirectoryandBDEalias"

DBDEMOS"

.

LangResources

Containresourcefilesforvariouslanguages.

DataService

Containfilesthatcontainobjectsthatallowstosortdatainvarioustypesofdatasets.

ORDERS

Containtextfilesinwhichdescribedhowtoregister 

variousversionsofEhLib.

HLP

Containhelpfiles.

Ehlib-withoutsource'

versionor'

Ehlib-Evaluationversion'

:

ContainallbinaryfileswhichareneedforC++Builder5.

ContainallbinaryfileswhichareneedforC++Builder6.

ContaininterfacepartofsourcefilesofEhLib.（Onlyforinformation,notrequireforinstallation.）

ContainallbinaryfileswhichareneedforDelphi5.

ContainallbinaryfileswhichareneedforDelphi6.

ContainallbinaryfileswhichareneedforDelphi7.

Create,ifneed,newdirectory"

EhLib"

inyourDelphi_Xdirectory.（Forinstance:

C:

\Delphi6\EhLib）.

IfyouhaveEhLib-sourceincludeversionthencopytothisdirectoryfilesfromCommonandDelphi6directoryofEhLibarchive.

IfyouhaveEhLib-withoutsourceversionorevaluationversionEhLibthencopytothisdirectoryfilesfrom