Edit code please

This is a discussion on Edit code please within the C++ Programming forums, part of the General Programming Boards category; The following code asks the user to enter a GIF file name and then it'll show it; i want it ...

  1. #1
    Flash Animator, OF DOOOOM bluehead's Avatar
    Join Date
    Nov 2001

    Edit code please

    The following code asks the user to enter a GIF file name and then it'll show it; i want it so I can enter the GIF place; make it so i enter the filename instead


    //256 COLOR GIF ONLY

    #include <stdio.h>
    #include <string.h>
    #include <conio.h>
    #include <iostream.h>
    #include <dos.h>
    struct GIFHeader {
    char Signature [7];
    unsigned int ScreenWidth, ScreenHeight;
    unsigned char Depth, Background, Zero;
    struct GIFDescriptor {
    char Separator;
    unsigned int ImageLeft, ImageTop, ImageWidth, ImageHeight;
    unsigned char Depth;

    char far *Screen = (char far *)0xA0000000L;
    //For loading from the file
    FILE *GIFFile;
    unsigned int BPointer;
    unsigned char Buffer [257];
    //GIF data is stored in blocks of a certain size
    unsigned char BlockSize;
    //For loading the code
    unsigned char CodeSize;
    char BitsIn;
    unsigned char Temp;
    unsigned int X, Y, tlX, tlY, brX, brY;
    //The string table
    unsigned int Prefix [4096];
    unsigned char Suffix [4096];

    //This sets the display to VGA 320x200 in 256 colours
    void VGAScreen ()
    asm {
    mov ax, 0x13
    int 0x10

    //This resets the display to text mode
    void TextScreen ()
    asm {
    mov ax, 0x3
    int 0x10

    //This sets a DAC register to a specific Red Green Blue-value
    void SetDAC(unsigned char DAC, unsigned char R, unsigned char G, unsigned char B)
    outportb (0x3C8, DAC);
    outportb (0x3C9, R);
    outportb (0x3C9, G);
    outportb (0x3C9, B);

    //This sets one pixel on the screen
    void PutPixel (unsigned int x, unsigned int y, unsigned char c)
    Screen [(y << 8) + (y << 6) + x] = c;

    //Function to read from the buffer
    unsigned char LoadByte ()
    //Read next block}
    if (BPointer == BlockSize) {
    fread (Buffer, BlockSize + 1, 1, GIFFile);
    BPointer = 0;

    //Return byte
    return Buffer [BPointer++];

    //Procedure to read the next code from the file
    unsigned int ReadCode ()
    int Counter;
    unsigned int Code;

    Code = 0;
    //Read the code, bit by bit
    for (Counter = 0; Counter < CodeSize; Counter++) {
    //Maybe, a new byte needs to be loaded with a further 8 bits
    if (++BitsIn == 9) {
    Temp = LoadByte ();
    BitsIn = 1;

    //Add the current bit to the code
    if (Temp & 1) Code += 1 << Counter;
    Temp >>= 1;
    return Code;

    //Procedure to draw a pixel
    void NextPixel (unsigned int c)
    //Actually draw the pixel on screen
    PutPixel (X, Y, c & 255);

    //Move to next row, if necessary
    if (++X == brX) {
    X = tlX;

    //Local function to output a string. Returns the first character.
    unsigned char OutString (unsigned int CurCode)
    unsigned int OutCount;
    unsigned char OutCode [1024];

    //If it's a single character, output that
    if (CurCode < 256) {
    NextPixel (CurCode);
    } else {
    OutCount = 0;

    //Store the string, which ends up in reverse order
    do {
    OutCode [OutCount++] = Suffix [CurCode];
    CurCode = Prefix [CurCode];
    } while (CurCode > 255);

    //Add the last character
    OutCode [OutCount++] = CurCode;

    //Output all the string, in the correct order
    do {
    NextPixel (OutCode [--OutCount]);
    } while (OutCount);
    //Return 1st character
    return CurCode;

    //This actually loads the GIF
    void LoadGIF (char *Filename)
    //For loading from the GIF file
    struct GIFHeader Header;
    struct GIFDescriptor Descriptor;

    //Colour information
    unsigned char BitsPerPixel,
    unsigned int DAC;
    unsigned char Palette [256][3];

    //For indexing the string table
    unsigned int FirstFree, FreeCode;

    //All the code information
    unsigned char InitCodeSize;
    unsigned int Code, OldCode, MaxCode;

    //Special codes
    unsigned int ClearCode, EOICode;

    //Check whether the GIF file exists, and open it
    GIFFile = fopen (Filename, "rb");
    if (GIFFile == 0) {
    TextScreen ();
    printf ("Could not open file %s", Filename);

    //Read header
    fread (&Header, 6, 1, GIFFile);
    Header.Signature [6] = 0;
    fread (&Header.ScreenWidth, sizeof (Header) - 7, 1, GIFFile);

    //Check signature and terminator
    if ((strcmp (Header.Signature, "GIF87a")
    && strcmp (Header.Signature, "GIF89a"))
    || Header.Zero) {
    TextScreen ();
    printf ("Not a valid GIF file\n");

    //Get amount of colours in image
    BitsPerPixel = 1 + (Header.Depth & 7);
    NumOfColours = (1 << BitsPerPixel) - 1;

    //Load global colour map
    fread (Palette, 3, (NumOfColours + 1), GIFFile);
    for (DAC = 0; DAC <= NumOfColours; DAC++)
    SetDAC (DAC, Palette [DAC][0] >> 2,
    Palette [DAC][1] >> 2,
    Palette [DAC][2] >> 2);

    //Load the image descriptor
    fread (&Descriptor, sizeof (Descriptor), 1, GIFFile);

    if (Descriptor.Separator != ',') {
    TextScreen ();
    printf ("Incorrect image descriptor.\n");

    //Get image corner coordinates
    tlX = Descriptor.ImageLeft;
    tlY = Descriptor.ImageTop;
    brX = tlX + Descriptor.ImageWidth;
    brY = tlY + Descriptor.ImageHeight;

    //Some restrictions apply
    if (Descriptor.Depth & 128) {
    TextScreen ();
    printf ("Local colour maps not supported\n");
    if (Descriptor.Depth & 64) {
    TextScreen ();
    printf ("Interlaced images not supported\n");

    //Get initial code size
    fread (&CodeSize, 1, 1, GIFFile);

    //GIF data is stored in blocks, so it's necessary to know the size
    fread (&BlockSize, 1, 1, GIFFile);

    //Start loader
    BPointer = BlockSize;

    //Special codes used in the GIF spec
    ClearCode = 1 << CodeSize; //Code to reset
    EOICode = ClearCode + 1; //End of file

    //Initialize the string table
    FirstFree = ClearCode + 2; //Strings start here
    FreeCode = FirstFree; //Strings can be added here

    //Initial size of the code and its maximum value
    InitCodeSize = ++CodeSize;
    MaxCode = 1 << CodeSize;

    BitsIn = 8;

    //Start at top left of image
    X = Descriptor.ImageLeft;
    Y = Descriptor.ImageTop;

    do {
    //Read next code
    Code = ReadCode ();

    //If it's an End-Of-Information code, stop processing
    if (Code == EOICode) break;
    //If it's a clear code...
    else if (Code == ClearCode) {
    //Clear the string table
    FreeCode = FirstFree;

    //Set the code size to initial values
    CodeSize = InitCodeSize;
    MaxCode = 1 << CodeSize;

    //The next code may be read
    Code = ReadCode ();
    OldCode = Code;

    //Set pixel
    NextPixel (Code);
    //Other codes
    } else {
    /*If the code is already in the string table, it's string is displayed,
    and the old string followed by the new string's first character is
    added to the string table.*/
    if (Code < FreeCode)
    Suffix [FreeCode] = OutString (Code);
    else {
    /*If it is not already in the string table, the old string followed by
    the old string's first character is added to the string table and
    Suffix [FreeCode] = OutString (OldCode);
    NextPixel (Suffix [FreeCode]);

    //Finish adding to string table
    Prefix [FreeCode++] = OldCode;

    //If the code size needs to be adjusted, do so
    if (FreeCode >= MaxCode && CodeSize < 12) {
    MaxCode <<= 1;

    //The current code is now old
    OldCode = Code;
    } while (Code != EOICode);

    //Close the GIF file
    fclose (GIFFile);

    void main (int argcount, char *argvalue[])
    char FileName [80];

    //Check if a filename was passed as a parameter, otherwise ask for one
    if (argcount > 1) {
    strcpy (FileName, argvalue [1]);
    } else {
    printf ("Enter filename:");
    gets (FileName);

    //Switch to graphics screen
    VGAScreen ();
    //Load GIF file
    LoadGIF (FileName);
    //Wait for keypress
    getch ();
    //Switch back to text mode
    TextScreen ();

    #if _emo
      #define stereo_type_i_dislike

  2. #2
    Intranasal Heroin User Xterria's Avatar
    Join Date
    Sep 2001
    Buffalo, NY
    in main() say
    int main()
    in loadgif make sure for every directory you have double slashes

    as simple as that

  3. #3
    Registered User Dual-Catfish's Avatar
    Join Date
    Sep 2001
    LoadGIF("C:/CrapPicture.bmp"); Will also work

  4. #4
    Flash Animator, OF DOOOOM bluehead's Avatar
    Join Date
    Nov 2001
    It never worx: can you be a lil more specific on how to do it?
    #if _emo
      #define stereo_type_i_dislike

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