c# - Using the activeX Control "AcroPDF.dll" my application works fine, but crashes on startup if adobe acrobat is not installed -


i have application adds text pdf files, , have axacropdf1 preview panel borrows acrobat show status of pdf file, not necessary function of program, so i'd have program still start when acrobat not installed albeit more limited functionality, , user wont have preview panel fine. how can this?

the thing think try adding catch/exception when this.axacropdf1 initializing when program starts, allows me put message popup adobe reader required, program still crashes after that, have program start regardless, , not call on when adobe not installed, or other suggestions guys have application still function or without adobe.

i know how check if adobe installed, don't know how apply result program.

the catch exception on initializing gives following error (i'm noob not giving information here):

system.runtime.interopservices.comexception (0x80040154): class not registered (exception hresult: 0x80040154 (regdb_e_classnotreg))    @ system.windows.forms.unsafenativemethods.cocreateinstance(guid& clsid, object punkouter, int32 context, guid& iid)    @ system.windows.forms.axhost.createwithlicense(string license, guid clsid)    @ system.windows.forms.axhost.createinstancecore(guid clsid)    @ system.windows.forms.axhost.createinstance()    @ system.windows.forms.axhost.getocxcreate()    @ system.windows.forms.axhost.transitionupto(int32 state)    @ system.windows.forms.axhost.createhandle()    @ system.windows.forms.control.createcontrol(boolean fignorevisible)    @ system.windows.forms.control.createcontrol(boolean fignorevisible)    @ system.windows.forms.control.createcontrol()    @ system.windows.forms.control.wmshowwindow(message& m)    @ system.windows.forms.control.wndproc(message& m)    @ system.windows.forms.scrollablecontrol.wndproc(message& m)    @ system.windows.forms.containercontrol.wndproc(message& m)    @ system.windows.forms.form.wmshowwindow(message& m)    @ system.windows.forms.form.wndproc(message& m)    @ system.windows.forms.control.controlnativewindow.onmessage(message& m)    @ system.windows.forms.control.controlnativewindow.wndproc(message& m)    @ system.windows.forms.nativewindow.callback(intptr hwnd, int32 msg, intptr wparam, intptr lparam)

solution: decided use inno installer since have dll files, , in installer script, adobe check, , if dont have adobe or right version prompt user download reader. here basic code check adobe:

    [code]         procedure exitprocess(exitcode:integer);   external 'exitprocess@kernel32.dll stdcall';   function getacrobatreaderversion(): string; var   sversion:  string; begin   sversion := '';   regquerystringvalue( hklm, 'software\microsoft\windows\currentversion\app paths\acrord32.exe',      '', sversion );   getversionnumbersstring( sversion , sversion );   result := sversion;   end;  function getacrobatversion(): string; var   sversion2: string; begin       sversion2 := '';   regquerystringvalue( hklm, 'software\microsoft\windows\currentversion\app paths\acrobat.exe',      '', sversion2 );   getversionnumbersstring( sversion2 , sversion2 );   result := sversion2; end;    function nextbuttonclick(curpage: integer): boolean; begin      // default go next page   result := true;    if curpage = wpwelcome   begin      if length( getacrobatreaderversion + getacrobatversion() ) = 0     begin       msgbox( 'adobe not detected',  mbinformation, mb_ok );        result := false;       exitprocess(0);//adobe isn't installed, exit installer     end      else       //msgbox( 'acrobat reader installed version ' + getacrobatreaderversion() ,       msgbox( 'adobe detected',  mbinformation, mb_ok );        end;   end;

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