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SDF Component Toolkit Applications, Updating SDF Files—an ASP Example, Updating SDF Files

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SDF Component Toolkit Applications This section presents example applications using the SDF Component Toolkit: one Active Server Page (ASP) example and threeVisual Basic (VB) examples. The SDF Component Toolkit is a set of COM objects for reading and writing Spatial Data Files (SDFs), as well as their supporting Spatial Index Files (SIFs) and Key Index Files (KIFs). The spatial data displayed in Autodesk MapGuide maps (map features such as roads, countries, buildings, and so on) is contained in SDFs. SDF data is indexed in SIFs and KIFs. You can access SDF Component Toolkit objects in development environments such as C++, Visual Basic, VBA, VBScript, Java, JScript, ASP, CGI, and ColdFusion. For more information about the SDF Component Toolkit, refer to the SDF Component Toolkit Help, a help file (SDFCOMTK.HLP) located in the \Help directory in your SDF Component Toolkit directory. Updating SDF Files-an ASP Example You can use the SDF Component Toolkit to create server-side applications that read and modify existing SDF files. These applications can interact with client-side scripts, allowing for dynamic updates based on user input. For example, you could create an application that lets users add polygon lot lines or points of interest to a map from their browser. You can use the SDF Component Toolkit to add points, polylines, or polygons to an SDF file when the user clicks the map. Note that Autodesk MapGuide contains a similar functionality called redlining. This means that users can add features to the map without using the SDF Component Toolkit (see "Custom Redlining Application" on page 136). However, the difference between the redlining functionality and the example in this section is that redlining changes are saved to the MWF on the user's computer, whereas the example in this section updates the data source for the map. With redlining, only the user sees the changes unless that MWF is then posted to the server. With the following SDF example, any map that uses the SDF file as its data source will display the new points. SDF Component Toolkit Applications | 171

Section	Page
Developer’s Guide	1
Contents	3
Introduction	7
What’s New in Release 6	8
Autodesk DWG Data Source Support	8
Enhanced Support for Map Redraw Operations	8
Symbol Bitmap Support	8
Map Mode Retrieval Support	9
Java Edition Platform Support Changes	9
Before You Begin	9
Familiarity with Autodesk MapGuide	9
Programming and Scripting Languages	10
Your Audience	10
User Help	11
About the Autodesk MapGuide Viewer API	11
Autodesk MapGuide Viewer API Help	13
Autodesk MapGuide Web Site	13
What Is an Autodesk MapGuide Viewer API Application	13
Viewing Maps	14
Querying and Updating Data	14
Creating an Autodesk MapGuide Viewer API Application	15
Displaying Maps	17
Overview	18
Map Display for ActiveX Control and Plug-In	20
Linking to a Map	20
Displaying a Linked Map in a Different Window or Frame	21
Displaying a Specific Area of the Map	21
Embedding a Map	22
Embedding a Map in a Frame-Based Page	23
Map Display for the Java Edition	24
Map Display for Autodesk MapGuide LiteView	26
Installing Viewers on Client Machines	27
Accessing Maps	31
Overview	32
Map Access for ActiveX Control and Plug-In	32
Required Software for Autodesk MapGuide Viewer Plug-In	34
Map Access for the Java Edition	35
Map Access from HTML	35
Using JavaScript or JScript	35
Map Access Using Java	38
Wrapper Java Applet	38
Peer Java Applet	38
Wrapper Java Application	38
Required Software for the Java Edition	39
Java Edition Differences	39
Functional Differences with Java Edition	39
Browser Differences with Java Edition	40
Communicating with the Plug-In from a Java Applet	40
Accessing the Plug-In from a Java Applet	41
Calling JavaScript Functions from a Java Applet	42
Accessing Secure Data	43
Handling Busy State and Map Refresh	43
About the Busy State	43
Controlling Map Refresh Operations	45
Using the autoRefresh Flag	45
AutoRefresh Flag Caveats	46
Detecting Map Refreshes	46
Detecting a Change in the Busy State	46
Controlling Intermediate Update Map Redraw Operations	47
Handling Errors	47
Getting Error Codes	47
Checking for Incorrect Argument Types	48
Debugging an Application	48
Working with Map Layers, Map Features, and Printing	49
Overview	50
Working with Map Layers	50
Counting Map Layers	50
Listing Map Layers	51
Adding a Map Layer	53
Linking Map Layers	53
Toggling Map Layer Visibility On and Off	55
Working with Map Features	56
Getting Keys of Selected Map Features	56
Getting Coordinates of a Selected Map Feature	58
Invoking Select Radius Mode	61
Zooming In on Selected Features	61
Counting Map Features	62
Working with Printing	64
Setting the Print Priority	65
Enabling the Print Events	66
Positioning Page Elements with Page Coordinate System Units	67
Adding Custom Page Elements	68
Handling Events	69
Overview	70
Working with Event Handlers	70
Browser Differences	71
Event Observer Set Methods	71
Setting Up Event Handlers	72
Plug-In and Java Edition Event Handlers	72
ActiveX Control Event Handlers	75
Plug-In and ActiveX Control Event Handlers	75
VBScript Example	75
JavaScript Example	77
VBScript and JavaScript Example	78
Writing Event Handlers	78
Page Setup Event Handler Example	79
Print Event Handler Example	81
Plug-In Event Handler Example	83
Using Reports to Query and Update Data Sources	85
Overview	86
How Reports Are Generated	86
Specifying the Report Script	86
The Request	87
Launching the Report	87
Introducing ColdFusion and ASP	88
Creating Report Scripts with ColdFusion	89
Listing File Contents with ColdFusion	89
Setting Up the Query	90
Controlling the Output	90
Seeing the Results	90
Querying and Displaying Data via the Map with ColdFusion	92
Setting Up the Report in Autodesk MapGuide Author	92
Creating the Report Script	94
Creating an HTML Page to Display the Map	95
Seeing the Results	95
Redirecting Report Output	96
Adding a Button with the Viewer API	100
Modifying a Database via the Map with ColdFusion	102
Setting Up the Report in Autodesk MapGuide Author	103
Creating the Report Scripts	104
Creating an HTML Page to Display the Map	107
Creating a Custom Menu Item	107
Accessing Your Application with the Viewer API	108
Creating Report Scripts with ASP	109
Summary of ASP Objects, Components, and Events	110
Listing File Contents with ASP	111
Specifying a Scripting Language	112
Selecting Database Records	112
Controlling the Output	113
Seeing the Results	114
Querying and Displaying Data via the Map with ASP	115
Setting Up the Report in Autodesk MapGuide Author	116
Creating the Report Script	117
Creating an HTML Page to Display the Map	118
Seeing the Results	119
Redirecting Report Output	120
Adding a Button with the Viewer API	122
Modifying a Database via the Map with ASP	125
Setting Up the Report in Autodesk MapGuide Author	126
Creating the Report Scripts	127
Creating an HTML Page to Display the Map	131
Creating a Custom Menu Item	132
Accessing Your Application with the Viewer API	133
Applications	135
Overview	136
Custom Redlining Application	136
Redlining Example Code	137
Municipal Application	140
Municipal Application Example Code	141
Facility Management Application	156
Facilities Management Application Example Code	157
DWG Filtering Application	164
Understanding Layers in Autodesk MapGuide	165
Changing Map Layer Data Source Properties	165
DWG Filtering Application Example Code	166
Selection Changed Function (selChanged)	166
Show Properties Function (showProperties)	168
SDF Component Toolkit Applications	171
Updating SDF Files—an ASP Example	171
Converting to an SDF File—a Visual Basic Example	181
Getting SDF File Information—a Visual Basic Example	188
Copying an SDF File—a Visual Basic Example	196
Index	203
A	203
B	203
C	203
D	204
E	204
F	205
G	205
H	205
I	205
J	205
K	205
L	205
M	206
N	206
O	206
P	206
Q	207
R	207
S	207
U	207
V	207
W	208
X	208

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SDF Component Toolkit Applications

171

SDF Component Toolkit Applications

This section presents example applications using the SDF Component Toolkit:

one Active Server Page (ASP) example and threeVisual Basic (VB) examples.

The SDF Component Toolkit is a set of COM objects for reading and writing

Spatial Data Files (SDFs), as well as their supporting Spatial Index Files (SIFs)

and Key Index Files (KIFs). The spatial data displayed in Autodesk MapGuide

maps (map features such as roads, countries, buildings, and so on) is

contained in SDFs. SDF data is indexed in SIFs and KIFs. You can access SDF

Component Toolkit objects in development environments such as C++,

Visual Basic, VBA, VBScript, Java, JScript, ASP, CGI, and ColdFusion.

For more information about the SDF Component Toolkit, refer to the SDF

Component Toolkit Help, a help file (

SDFCOMTK.HLP

) located in the

\Help

directory in your

SDF Component Toolkit

directory.

Updating SDF Files

—

an ASP Example

You can use the SDF Component Toolkit to create server-side applications

that read and modify existing SDF files. These applications can interact with

client-side scripts, allowing for dynamic updates based on user input. For

example, you could create an application that lets users add polygon lot lines

or points of interest to a map from their browser.

You can use the SDF Component Toolkit to add points, polylines, or poly-

gons to an SDF file when the user clicks the map. Note that Autodesk

MapGuide contains a similar functionality called

redlining

. This means that

users can add features to the map without using the SDF Component Toolkit

(see

“

Custom Redlining Application

”

on page 136). However, the difference

between the redlining functionality and the example in this section is that

redlining changes are saved to the MWF on the user

’

s computer, whereas the

example in this section updates the data source for the map. With redlining,

only the user sees the changes unless that MWF is then posted to the server.

With the following SDF example, any map that uses the SDF file as its data

source will display the new points.