dialogboxparam_c# dll c 类_win32 子窗体 消息循环

DialogBoxParam

TheDialogBoxParamfunctioncreatesamodaldialogboxfromadialogboxtemplateresource.Beforedisplayingthedialogbox,thefunctionpassesanapplication-definedvaluetothedialogboxprocedureasthelParamparameteroftheWM_INITDIALOGmessage.Anapplicationcanusethisvaluetoinitializedialogboxcontrols.

INT_PTRDialogBoxParam(

HINSTANCEhInstance,//handletomodule

LPCTSTRlpTemplateName,//dialogboxtemplate

HWNDhWndParent,//handletoownerwindow

DLGPROClpDialogFunc,//dialogboxprocedure

LPARAMdwInitParam//initializationvalue

);

Parameters

hInstance

[in]Handletothemodulewhoseexecutablefilecontainsthedialogboxtemplate.

lpTemplateName

[in]Specifiesthedialogboxtemplate.Thisparameteriseitherthepointertoanull-terminatedcharacterstringthatspecifiesthenameofthedialogboxtemplateoranintegervaluethatspecifiestheresourceidentifierofthedialogboxtemplate.Iftheparameterspecifiesaresourceidentifier,itshigh-orderwordmustbezeroanditslow-orderwordmustcontaintheidentifier.YoucanusetheMAKEINTRESOURCEmacrotocreatethisvalue.

hWndParent

[in]Handletothewindowthatownsthedialogbox.

lpDialogFunc

[in]Pointertothedialogboxprocedure.Formoreinformationaboutthedialogboxprocedure,seeDialogProc.

dwInitParam

[in]SpecifiesthevaluetopasstothedialogboxinthelParamparameteroftheWM_INITDIALOGmessage.

ReturnValues

Ifthefunctionsucceeds,thereturnvalueisthevalueofthenResultparameterspecifiedinthecalltotheEndDialogfunctionusedtoterminatethedialogbox.

IfthefunctionfailsbecausethehWndParentparameterisinvalid,thereturnvalueiszero.ThefunctionreturnszerointhiscaseforcompatibilitywithpreviousversionsofWindows.Ifthefunctionfailsforanyotherreason,thereturnvalueis–1.Togetextendederrorinformation,callGetLastError.

Remarks

TheDialogBoxParamfunctionusestheCreateWindowExfunctiontocreatethedialogbox.DialogBoxParamthensendsaWM_INITDIALOGmessage(andaWM_SETFONTmessageifthetemplatespecifiestheDS_SETFONTorDS_SHELLFONTstyle)tothedialogboxprocedure.Thefunctiondisplaysthedialogbox(regardlessofwhetherthetemplatespecifiestheWS_VISIBLEstyle),disablestheownerwindow,andstartsitsownmessagelooptoretrieveanddispatchmessagesforthedialogbox.

WhenthedialogboxprocedurecallstheEndDialogfunction,DialogBoxParamdestroysthedialogbox,endsthemessageloop,enablestheownerwindow(ifpreviouslyenabled),andreturnsthenResultparameterspecifiedbythedialogboxprocedurewhenitcalledEndDialog.

Windows95/98:Thesystemcansupportamaximumof255controlsperdialogboxtemplate.Toplacemorethan255controlsinadialogbox,createthecontrolsintheWM_INITDIALOGmessagehandlerratherthanplacingtheminthetemplate.

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