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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Karsten8[/i] [br]Origin Ver. and Service Release: 2019 9.6.172 Operating System:win10 Hello, it would be great if you can help me to understand the c-functions. Using the setlinetype does not work whereas setcolor works fine in my Code. The error message is: :Error, Member function DataPlot::SetLineType not defined or does not have matching prototype. I used this page to read about the setlinetype: https://www.originlab.com/doc/OriginC/ref/DataPlot-SetLineType Here is my Code to Change the line style of all Graphs inside my project: void set_line_type(string& graph, vector<int> input){ GraphPage gp(graph); foreach(GraphLayer gls in gp.Layers){ for (int i = 0; i < input.GetSize(); i++){ DataPlot dps = gls.DataPlots(input[i]); dps.SetLineType(3); // <- causes the error dps.SetLineType(LINE_STYLE_DASH); // <- causes error as well dps.SetColor(1, TRUE); // <- this works } } return; } In other words the compiler gives an error messeage when I use the setlinetype but I think I use it as proposed (see web page at the top). I didn't found other examples using setlinetype and the search function couldn't help as well. Thanks for your help. Best regards Karsten8. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.