CODEWITHSUNDEEP
cocoaxcodelinkercore-plot
Ian Turner
Ian Turner

Reputation: 1413

Errors in linking during build with Core Plot

I have just added a Core Plot view to my application based on a tutorial (http://www.switchonthecode.com/tutorials/using-core-plot-in-an-iphone-application). I have put the Core Plot drawing code in the windowDidLoad method of the window controller for the window where I have included the CPLayerHostingView. The code for the plot is:

CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-6) 
                                               length:CPDecimalFromFloat(12)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-5) 
                                               length:CPDecimalFromFloat(30)];

CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;

CPLineStyle *lineStyle = [CPLineStyle lineStyle];
lineStyle.lineColor = [CPColor blackColor];
lineStyle.lineWidth = 2.0f;

axisSet.xAxis.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"5"] decimalValue];  
axisSet.xAxis.minorTicksPerInterval = 4;
axisSet.xAxis.minorTicksPerInterval = 4;
axisSet.xAxis.majorTickLineStyle = lineStyle;
axisSet.xAxis.minorTickLineStyle = lineStyle;
axisSet.xAxis.axisLineStyle = lineStyle;
axisSet.xAxis.minorTickLength = 5.0f;
axisSet.xAxis.majorTickLength = 7.0f;
axisSet.xAxis.axisLabelOffset = 3.0f;

axisSet.yAxis.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"5"] decimalValue];  
axisSet.yAxis.minorTicksPerInterval = 4;
axisSet.yAxis.minorTicksPerInterval = 4;
axisSet.yAxis.majorTickLineStyle = lineStyle;
axisSet.yAxis.minorTickLineStyle = lineStyle;
axisSet.yAxis.axisLineStyle = lineStyle;
axisSet.yAxis.minorTickLength = 5.0f;
axisSet.yAxis.majorTickLength = 7.0f;
axisSet.yAxis.axisLabelOffset = 3.0f;

CPScatterPlot *xSquaredPlot = [[[CPScatterPlot alloc] 
                                initWithFrame:graph.defaultPlotSpace.bounds] autorelease];
xSquaredPlot.identifier = @"X Squared Plot";
xSquaredPlot.dataLineStyle.lineWidth = 1.0f;
xSquaredPlot.dataLineStyle.lineColor = [CPColor redColor];
xSquaredPlot.dataSource = self;
[graph addPlot:xSquaredPlot];

When I build I get the following errors:

".objc_class_name_CPPlotRange", referenced from: literal-pointer@__OBJC@__cls_refs@CPPlotRange in HistogramWindowController.o

"_CPDecimalFromFloat", referenced from: -[HistogramWindowController windowDidLoad] in HistogramWindowController.o -[HistogramWindowController windowDidLoad] in HistogramWindowController.o -[HistogramWindowController windowDidLoad] in HistogramWindowController.o -[HistogramWindowController windowDidLoad] in HistogramWindowController.o

".objc_class_name_CPLineStyle", referenced from: literal-pointer@__OBJC@__cls_refs@CPLineStyle in HistogramWindowController.o

".objc_class_name_CPXYGraph", referenced from: literal-pointer@__OBJC@__cls_refs@CPXYGraph in HistogramWindowController.o

".objc_class_name_CPScatterPlot", referenced from: literal-pointer@__OBJC@__cls_refs@CPScatterPlot in HistogramWindowController.o

".objc_class_name_CPPlotSymbol", referenced from: literal-pointer@__OBJC@__cls_refs@CPPlotSymbol in HistogramWindowController.o

".objc_class_name_CPColor", referenced from: literal-pointer@__OBJC@__cls_refs@CPColor in HistogramWindowController.o

".objc_class_name_CPFill", referenced from: literal-pointer@__OBJC@__cls_refs@CPFill in HistogramWindowController.o

ld: symbol(s) not found collect2: ld returned 1 exit status

I've never encountered an error like this. Can anyone shed any light on what the problem might be?

Cheers

Upvotes: 3

Views: 2822

Answers (5)

Ayrad
Ayrad

Reputation: 4056

Make sure you add the QuarzCore framework as well. This fixed my linking errors.

Upvotes: 0

gstrobl
gstrobl

Reputation: 11

I experienced the exact same link errors. For me, the problem was I was trying to run my application in the simulator. I don't know if I missed something somewhere, but I could only run on a device. Once I started to do that, no link errors.

Upvotes: 1

Brad Larson
Brad Larson

Reputation: 170317

There are some instructions on this wiki page for incorporating the framework into Mac projects. If you follow those, you should be able to avoid any problems with linking in the framework.

Upvotes: 1

Peter Hosey
Peter Hosey

Reputation: 96373

You might also check whether your application target is set to include 64-bit support and whether the framework has such support (use the file(1) command for the latter part). If you're building your app with 64-bit support, but try to link against a framework that doesn't have 64-bit support, the linker will throw errors like that when it tries to link the 64-bit portion of your app, while the 32-bit portions will succeed.

Upvotes: 0

Dave DeLong
Dave DeLong

Reputation: 243156

It means you haven't linked in the framework correctly. You've probably just added the framework to your project, #imported the header, but forgot to make sure that the framework is actually getting linked into your target.

Upvotes: 3

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