﻿ Function kartgeo2tk()
 Prototype and description of the function kartgeo2tk() (Function of the unlock requiring group "Map calculations")
 ```kartgeo2tk() Determination of a topographic map from geographic coordinates. Prototype of the DLL function in C++ syntax (attend lower case!): extern "C" __declspec(dllimport) unsigned long __stdcall kartgeo2tk( double nGeoLon, double nGeoLat, unsigned short *nTK1, unsigned short *nTK2, unsigned short *nTK3, unsigned short *nTK4); Prototype of the DLL function in Visual Objects syntax: _DLL function kartgeo2tk(; nGeoLon as real8,; // 8 Byte nGeoLat as real8,; // 8 Byte nTK1 ref word,; // 4 Byte nTK2 ref word,; // 4 Byte nTK3 ref word,; // 4 Byte nTK4 ref word); // 4 Byte as logic pascal:geodll32.kartgeo2tk // 4 Byte The function returns the numbers of the official topographic maps with the scale 1:25.000 (TK25, ordnance map) of the Federal Republic of Germany, in whose surface the geographical coordinate is present. Theoretically up to four maps can be calculated for one coordinate, if it is on the edge or in a corner of the map sheet. In determining the standard map cutting blade is considered. The function must receive the geographic coordinate nGeoLon and nGeoLat in [degrees] notation (ggg.nnn). The degrees portion (g) is integer, the minute and second portions are represented as decimal fraction of a degree (n). The parameters are passed and/or returned as follows: nGeoLon Geographic longitude in [degrees] notation. nGeoLat Geographic latitude in [degrees] notation. nTK1 Number of the first found TK25 as reference. (ref) nTK2 Number of the second found TK25 as reference. (ref) nTK3 Number of the third found TK25 as reference. (ref) nTK4 Number of the forth found TK25 as reference. (ref) returnVal In case of an error the function returns FALSE, otherwise TRUE. Unlocking: This function is a component of the unlock requiring function group "map calculations". It is unlocked for unrestricted use together with the other functions of the group by passing the unlock parameters, acquired from the software distribution company, trough the function setunlockcode(). Without unlocking only a few function calls for test purposes (shareware principle) are possible. ```