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I am a simple newbie at C++ but im eager to learn. I tried to use the sample code from a C++ book (windows game programming for dummies) and I compiled it on my Dev C++ compiler. After fixing some simple errors (usually spelling mistakes) I found 2 errors I can't figure out. Here are the errors:
[Warning] In function 'void Init_Graphics()";
'OL' undeclared (first use this function)
(Each undeclared identifier is reported only once for each)
And another error:
At global scope:
'main' must return 'int'
[Build Error] [main.o] Error 1
And here is the code:
Yes, I know its a simple game, but you gotta start somewhere.Code:#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <conio.h> #include <windows.h> #include <time.h> // DEFINES ///////////////// #define MAX_X 77 // Max X Pos for player #define SCROLL_POS 24 // The point that scrolling occurs // PROTOTYPES ////////////// void Init_Graphics(void); inline void Set_Color(int fcolor, int bcolor); inline void Draw_String(int x, int y, char *string); // GLOBALS ///////////////// CONSOLE_SCREEN_BUFFER_INFO con_info; // Holds screen info HANDLE hconsole; // Handle to Console int game_running = 1; // State of game 1=run 0=done // FUNCTIONS /////////////// void Init_Graphics(void) { // This initializes the console graphics engine COORD console_size = {80,25}; // Size of Console // Seed the random number generator with time srand((unsigned)time(NULL)); // Open i/o channel to console screen hconsole=CreateFile("CONOUT$",GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, OL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, OL); // Make sure we are in 80x25 SetConsoleScreenBufferSize(hconsole,console_size); // Get details for console screen GetConsoleScreenBufferInfo(hconsole,&con_info); } // end Init_Graphics /////////////////////////// inline void Set_Color(int fcolor, int bcolor=0) { // This function sets the color of the console output SetConsoleTextAttribute(hconsole,(WORD)((bcolor << 4) | fcolor)); } // End Set_Color /////////////////////////// inline void Draw_String(int x, int y, char *string) { // This function draws a string at the give x,y COORD cursor_pos; // used to pass coords // set printing position cursor_pos.X = x; cursor_pos.Y = y; SetConsoleCursorPosition(hconsole,cursor_pos); // Print the string in current color printf("%s",string); } // End Draw_String /////////////////////////// inline void Clear_Screen(void) { // This function clears the screen // Set color to white on black Set_Color(15,0); // clear the screen for (int index=0; index<=25; index++) Draw_String(0, SCROLL_POS,"\n"); } // End Clear_Screen // MAIN GAME LOOP ///////// void main(void) { char key; // Player input Data int player_x = 40; // Players X position // SECTION: initialization // Set up the console text graphics system Init_Graphics(); // Clear the screen Clear_Screen(); // SECTION: main event loop, this is where all the action // takes place, (the general loop is erase-move-draw) while(game_running) { // SECTION: erase all objects or clear screen // nothing to erase in our case // SECTION: get player input if (kbhit()) { // Get keyboard data, and filter it key = toupper(getch()); // Check if player is trying to exit, if so, exit if (key=='Q' || key==27) game_running=0; // Check if player is moving left if (key=='A') player_x--; // Check if player is moving right if (key=='S') player_x++; } // end if // SECTION: game logic and futhur processing // make sure player stays on screen if (++player_x > MAX_X) player_x=MAX_X; if (--player_x < 0) player_x=0; // SECTION: draw everything // draw next star at random position Set_Color(15,0); Draw_String(rand()%80, SCROLL_POS,".\n"); // Draw Player Set_Color(rand()%15,0); Draw_String(player_x,0,"<-*->"); Draw_String(0,0,""); // SECTION: synchronize to a constant frame rate Sleep(40); } // End while // SECTION: shutdown and bail Clear_Screen(); printf("\nG A M E O V E R \n\n"); } // End main
too bad I though it would be a cool game ..