I am trying to read a binary file and parse the bytes I have the white paper spec on Shapefiles to know how to parse the file, however I cannot seem to find the correct functions in ColdFusion to handle reading bytes and deciding what to do with them.
<cffile action="READBINARY"
file="mypath/www/_Dev/tl_2009_25_place.shp"
variable="infile" >
PDF file with spec:http://www.esri.com/library/whitepa开发者_Go百科pers/pdfs/shapefile.pdf
For example I have the spec:
Position Field Value Type Order
Byte 0 File Code 9994 Integer Big Byte 4 Unused 0 Integer Big Byte 8 Unused 0 Integer Big Byte 12 Unused 0 Integer Big Byte 16 Unused 0 Integer Big Byte 20 Unused 0 Integer Big Byte 24 File Length File Length Integer Big Byte 28 Version 1000 Integer Little Byte 32 Shape Type Shape Type Integer Little Byte 36 Bounding Box Xmin Double Little Byte 44 Bounding Box Ymin Double Little Byte 52 Bounding Box Xmax Double Little Byte 60 Bounding Box Ymax Double Little Byte 68* Bounding Box Zmin Double Little Byte 76* Bounding Box Zmax Double Little Byte 84* Bounding Box Mmin Double Little Byte 92* Bounding Box Mmax Double LittleIf this was just a flat text file i would use mid function to read my positions. Can this be done in ColdFusion and Which functions can achieve my goal?
I found this function inside of FarStream.as found at http://code.google.com/p/vanrijkom-flashlibs/wiki/SHP which is an Actionscript3 file, but it represents the kind of task i need to do.
private function readHeader(e: ProgressEvent): void {
// check header:
if (! ( readByte()==0x46
&& readByte()==0x41
&& readByte()==0x52
))
{
dispatchEvent(new IOErrorEvent
( IOErrorEvent.IO_ERROR
, false,false
, "File is not FAR formatted")
);
close();
return;
}
// version:
vMajor = readByte();
vMinor = readByte();
if (vMajor>VMAJOR) {
dispatchEvent(new IOErrorEvent
( IOErrorEvent.IO_ERROR
, false,false
, "Unsupported archive version (v."+vMajor+"."+vMinor+")")
);
close();
return;
}
// table size:
tableSize = readUnsignedInt();
// done processing header:
gotHeader= true;
}
And here is the final solution
<cfset shapeFile = createObject("java","com.bbn.openmap.layer.shape.ShapeFile").init('/www/_Dev/tl_2009_25_place.shp')>
<cfdump var="#shapeFile.getFileLength()#">
<cffile action="READBINARY" file="mypath/www/_Dev/tl_2009_25_place.shp" variable="infile" >
<cfset shapeFile = createObject("java","com.bbn.openmap.layer.shape.ShapeFile").init(infile)>
<cfdump var="#shapeFile#">
Maybe something like this?
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