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initgraph() Function in C++ Programming Language

initgraph() Function in C++

To create a program in Graphics Mode, the first step would be to include the header file graphics.h. This file is required for Graphics programming. After this, the graphics have to be initialized. C Language supports 16 Bit's MS-DOS environment. Initializing the Graphics mode is to call various functions, one such is called initgraph. initgraph initializes the graphics system by loading a graphics driver from disk (or validating a registered driver), and putting the system into graphics mode. To start the graphics system, first call the initgraph function. initgraph loads the graphics driver and puts the system into graphics mode. You can tell initgraph to use a particular graphics driver and mode, or to autodetect the attached video adapter at run time and pick the corresponding driver. If you tell initgraph to autodetect, it calls detectgraph to select a graphics driver and mode. initgraph also resets all graphics settings to their defaults (current position, palette, color, viewport, and so on) and resets graphresult to 0.

Syntax for initgraph() Function in C++

void initgraph (int *graphdriver, int *graphmode, char *pathtodriver);

graphdriver

This is an integer that indicates that the graphics driver has been used.

graphmode

It is also an integer value that detects the available graphics driver and initializes the graphics mode according to its highest resolution.

pathtodriver

This is the path of the directory that first searches the initgraph function graphics driver. If the graphics driver is not available then the system searches it in the current directory. It is necessary to pass the correct value of the three parameters in the initgraph function or else an unpredictable output is obtained.

intgd = DETECT, gm; initgraph (&gd, &gm, " ");

To initialize Graphics mode, you only have to write two lines. Here, we have taken two integer variables 'd' and 'm'. Here, DETECT is an enumeration type that identifies and identifies the proper graphics driver. The initgraph function has to pass the address of both the variables. You can see in the example that we have given a space at the position of the third variable. This means that if you do not know the driver's path then you can leave it blank. The compiler will auto-detect the path. initgraph always sets the internal error code; on success, it sets the code to 0. If an error occurred, *graphdriver is set to -2, -3, -4, or -5, and graphresult returns the same value as listed below: • grNotDetected -2 Cannot detect a graphics card • grFileNotFound -3 Cannot find driver file • grInvalidDriver -4 Invalid driver • grNoLoadMem -5 Insufficient memory to load driver

/* initgraph initializes the graphics system by loading a graphics driver from disk (or validating a registered driver), and putting the system into graphics mode. To start the graphics system, first call the initgraph function. initgraph loads the graphics driver and puts the system into graphics mode. You can tell initgraph to use a particular graphics driver and mode, or to autodetect the attached video adapter at run time and pick the corresponding driver. */ int DGraphics::Init( int gmode ) { int gdriver = VGA, errorcode; gdriver=installuserdriver("SVGA256",NULL); initgraph(&gdriver, &gmode, ""); if ( (errorcode = graphresult()) != grOk ) { cout << "Error: Graphics - %s\n" << grapherrormsg(errorcode); return FALSE; } ActiveMode=gmode; return TRUE; }

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