TatukGIS dk8 source
                                The TatukGIS Developer Kernel (DK) is a comprehensive GIS development toolkit incorporating 2,200 public/protected functions and properties. The DK is offered as two separate products: 1) a native Borland Delphi/C++ Builder VCL and 2) as an ActiveX control for compatibility with Visual Basic, Visual                            
                            
                            
                            
                        
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还可以使用
还不错,是一个二次开发包