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Thread: Write BITMAP data to file in C++

  1. #1
    Join Date
    Oct 2015
    Posts
    18

    Write BITMAP data to file in C++

    Hello all. I am currently trying to copy the header and pixel data from an image file and write this into a new image file. I am using a 256 colour bitmap and for testing have chosen a fixed height and width pixel of 150 and 90. A new file image file is created but when trying to load this, the following message is given: "Paint cannot read this file. This is not a valid bitmap file or its format is currently not supported. Would appreciate the support after many attempts. Below is the code I'm using:


    02 const int height = 150;

    03 const int width = 90;

    04

    05 unsigned char m_cHeaderData[1078];

    06 unsigned char** m_cImageData = new unsigned char* [height];

    07

    08 for( int i = 0; i <height; i++)

    09 {

    10 m_cImageData[i] = new unsigned char [width];

    11 }

    12

    13 ifstream* m_pInFile;

    14 m_pInFile = new ifstream;

    15 m_pInFile->open("image.bmp", ios::in | ios::binary);

    16 m_pInFile->seekg(0, ios::beg);

    17 m_pInFile->read(reinterpret_cast<char*>(m_cHeaderData), 1078); //bitmap bits start at offset 1078

    18

    19 for(int i = 0; i <height; i++)

    20 {

    21 m_pInFile->read(reinterpret_cast<char*>(m_cImageData[i]), width);

    22 }

    23

    24 m_pInFile->close();

    25

    26 ofstream* m_pOutFile;

    27 m_pOutFile = new ofstream;

    28 m_pOutFile->open("imageCopy.bmp", ios:ut | ios::trunc | ios::binary);

    29 m_pOutFile->write(reinterpret_cast<char*>(m_cHeaderData), 1078);

    30 for(int i = 0; i <height; i++)

    31 {

    32 m_pOutFile->write(reinterpret_cast<char*>(m_cImageData[i]), width;

    33 }

    34 m_pOutFile->close();

    35

    36

    37 //deallocate memory:

    38 delete m_pInFile;

    39 delete m_pOutFile;

    40 for(int i = 0; i <height; i++)

    41 {

    42 delete[] m_cImageData[i];

    43 }

    44 delete[] m_cImageData;

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Location
    Hanover Germany
    Posts
    19,592

    Re: Write BITMAP data to file in C++

    Please, format your code properly with indents and place it within the CODE tags!
    Victor Nijegorodov

  3. #3
    Join Date
    Jan 2012
    Location
    India
    Posts
    193

    Re: Write BITMAP data to file in C++

    Bitmap files have their own headers and data in special format . Pl read about that . You will get the file format on NET. The file starts with BM ...
    Last edited by new_2012; October 8th, 2015 at 04:01 AM.

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