I've found this unpredictable too - because the picture box control belongs to the VB app but MapInfo controls its contents. With MapX its more straightforward.
Preventing unwanted redraws ca transform the performance of an app and its vital to be able to do it. The only way I've been able to get predictable results is to have two picture boxes the same size in the same place on a form, one of which is reparented to MapInfo and the other of which is visible off. When you need to lock the screen, grab the contents of the MapInfo window using the HWND into a Picture object - theres example code on the Micrososft site at http://support.microsoft.com/default.aspx?scid=KB;en-us;q161299. I've implemented this as a class. Then hide the picture box with the map, set the other one visible and assign the picture object to it. Depending on your screen there may be a tiny jump but you can adjust the top/left properties of the picture box a few twips to allow for it. When you want to unlock reverse the visibility of the two picture boxes. It seems longwinded but its instantaneous and the highlighting/selection etc in the map is maintained. HTH Paul Crisp Syntegra Innovation Place Delta Bank Road Newcastle NE11 9DJ Tel 0191 461 4522 Fax 0191 460 1987 -----Original Message----- From: Matt Bolton [mailto:[EMAIL PROTECTED] Sent: 30 October 2003 14:53 To: Simmonds, Ashley (PTB) Cc: [EMAIL PROTECTED] Subject: Re: MI-L Stop map redraw (integrated mapping) Ash, I'm using a MI window integrated on the VB form (in a pic box). I gather from your post that you've tried set map redraw off, and it works sometimes, but not others - is that right? Not sure about the echo options - does it work in VB as well as VBA (a help search only bought up a reference in Access Help). I've tried it in my code, but it doesn't work - perhaps because the reference to MI is as an object: Set mobjMI = CreateObject("Mapinfo.Application") MI_Do "Set Application Window " & mlPicHwnd mobjMI.Echo False How do you use it? Thanks, Matt Simmonds, Ashley (PTB) wrote: >is your map window integrated into a form or is a form controlling the MI >window? > >if it's on a form, you could just set the host application echo properties >to false or make the form not visible for a bit. > >i know it's annoying though, i think in my apps when there's a lot of >processing to happen on the map, i ended up just making the form invisible. >a decent process, zoom to with long zoom and redraw would usually take about >15 seconds, but i got it down to like 3 by not displaying stuff as it >happened. > >as to the map redraw option, i've found it to be hit and miss, so i've >pretty much gotten rid of the command and just use the application.echo >feature on the host app. > >dang, huh? > >ash > >-----Original Message----- >From: Matt Bolton [mailto:[EMAIL PROTECTED] >Sent: Thursday, 30 October 2003 4:39 PM >To: [EMAIL PROTECTED] >Subject: MI-L Stop map redraw (integrated mapping) > > >Hi all, > >I'm doing some complex MI map & data manipulation via integrated mapping >using VB (I know I could do with MapBasic, but I'm more familiar with >VB). I want to be able to do all the processing without the map window >redrawing after each step, but have tried the following without success: > >objMI.Do "Set Event Processing Off" > and >objMI.Do "Set Map Redraw Off" > >Neither seems to have any effect. Can anyone suggest what I need to do >to get either of these to work? > >Thanks, > >Matt > > > -- Matt Bolton Mach 3 IT Mobile 0412 122 416 Email [EMAIL PROTECTED] --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 8960 ******************************************************************** This email may contain information which is privileged or confidential. If you are not the intended recipient of this email, please notify the sender immediately and delete it without reading, copying, storing, forwarding or disclosing its contents to any other person Thank you Check us out at http://www.syntegra.com ********************************************************************
