C # Call cards. DLL to implement a graphical Licensing Program

Using system; <br/> using system. collections. generic; <br/> using system. componentmodel; <br/> using system. data; <br/> using system. drawing; <br/> using system. text; <br/> using system. windows. forms; <br/> using system. runtime. interopservices; <br/> using system. windows. forms. design; </P> <p> namespace getcards <br/>{< br/> Public partial class form1: form <br/> {<br/> [dllimport ("cards. DLL ")] <br/> Public static extern bool cdtinit (ref int width, ref int height); </P> <p> [dllimport (" cards. DLL ")] <br/> Public static extern void cdtterm (); </P> <p> [dllimport (" cards. DLL ")] <br/> Public static extern bool cdtdraw (intptr HDC, int X, int y, int card, int mode, long color ); <br/> // mode = 0 table front, 1 table back, color I tried a lot from 0-0xff000, it seems that no color changes </P> <p> // [dllimport ("cards. DLL ")] <br/> // public static extern bool cdtdrawext (intptr HDC, int X, int y, int dx, int dy, int card, int type, long color); </P> <p> // [dllimport ("cards. DLL ")] <br/> // public static extern bool cdtanimate (intptr HDC, int cardback, int X, int y, int frame ); </P> <p> int [] BB = new int [100]; <br/> Public form1 () <br/>{< br/> initializecomponent (); <br/>}</P> <p> private void form1_load (Object sender, eventargs e) <br/>{< br/> int width, height; <br/> width = 0; Height = 0; <br/> cdtinit (ref width, ref height ); <br/>}</P> <p> private void btn_paintcard_click (Object sender, eventargs e) <br/>{< br/> int I, K, left_x, top_y, cardid; <br/> for (k = 0; k <= 3; k ++) <br/> {<br/> for (I = 1; I <= 13; I ++) <br/> {<br/> left_x = 20 + (I-1) * 15; // The width of the overlapping cards is 15 <br/> top_y = 20 + K * 100; // 13 cards in each row. the height is 20 <br/> cardid = (I-1) * 4 + k; // originally 52 cards were numbered <br/> cdtdraw (this. creategraphics (). gethdc (), left_x, top_y, cardid, 0, 9 ); <br/>}</P> <p> private void form=formclosed (Object sender, formclosedeventargs E) <br/>{< br/> cdtterm (); <br/>}</P> <p> private void btn_paintback_click (Object sender, eventargs E) <br/> {<br/> int I, left_x, top_y, backid; <br/> for (I = 0; I <= 11; I ++) // 12 back pictures of cards <br/>{< br/> backid = I; <br/> top_y = 20 + (I & 3) * 100; // if the value is less than or equal to 3, the tail of> 3 is equal to the vertical bars <br/> left_x = 20 + (I> 2) * 80 + 180 + 80; // The left card accounts for 15*12 + 80 = 260, that is, 20 of the rightmost card (implicit card size = 80) <br/> cdtdraw (this. creategraphics (). gethdc (), left_x, top_y, 54 + backid, 1, 9 ); <br/>}</P> <p> private void btn_random?click (Object sender, eventargs E) // The first method implements random card exchange <br/>{< br/> int II, K, left_x, top_y, cardid; <br/> int [] thearray = new int [52]; <br/> random r = new random (); <br/> listbox1.items. clear (); <br/> for (INT I = 0; I <52; I ++) <br/>{< br/> thearray [I] = I + 1; <br/>}< br/> for (INT I = 0; I <52; I ++) // performs 52 random exchanges between two cards <br/>{< br/> int A = R. next (52); // generate a random number of 0 ---> 51 <br/> int B = R. next (52); <br/> int TMP = thearray [a]; <br/> thearray [a] = thearray [B]; <br/> thearray [B] = TMP; <br/>}< br/> for (INT I = 0; I <52; I ++) <br/>{< br/> listbox1.items. add (thearray [I]); <br/> K = (INT) (I/13); <br/> II = I % 13 + 1; <br/> left_x = 20 + (ii-1) * 15; <br/> top_y = 20 + K * 100; <br/> cardid = thearray [I]-1; <br/> cdtdraw (this. creategraphics (). gethdc (), left_x, top_y, cardid, 0, 9 ); <br/>}</P> <p> private void btn_random2_click (Object sender, eventargs E) // The first method implements random card exchange <br/>{< br/> int II, K, left_x, top_y, cardid; <br/> int [] thearray = new int [52]; <br/> int I = 0; <br/> while (I <thearray. length) <br/>{< br/> thearray [I] = ++ I; <br/>}</P> <p> random r = new random (); <br/> listbox1.items. clear (); <br/> while (I> 1) // obtain the final value from 51 --> 1 random forward switch <br/>{< br/> Int J = R. next (I); <br/> int T = thearray [-- I]; <br/> thearray [I] = thearray [J]; <br/> thearray [J] = T; <br/>}</P> <p> for (I = 0; I <thearray. length; ++ I) <br/>{< br/> listbox1.items. add (thearray [I]. tostring (); <br/> K = (INT) (I/13); <br/> II = I % 13 + 1; <br/> left_x = 20 + (ii-1) * 15; <br/> top_y = 20 + K * 100; <br/> cardid = thearray [I]-1; <br/> cdtdraw (this. creategraphics (). gethdc (), left_x, top_y, cardid, 0, 9 ); <br/>}</P> <p >}< br/> compared with designer. CS saves a lot of trouble: </P> <p>