How to load and write binary files using gtk3 in C?

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I am unable to load binary files and create new binary with some part of the content from the read file. I used GFileoutputStream and g_file_load_contents but as soon as zero comes it takes it as terminating character which i don't want.I want to read even zeros and then extract data bit wise. Any help would be highly appreciated.

What I have tried:

C

void file_selected(GtkWidget *filechooserbutton, gpointer data,GtkTextBuffer *buffer)
{   
        filename=gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(filechooserbutton));
    g_file_get_contents(filename, &contents, NULL, NULL);

    text1 = g_substr(contents,0,value);     

    gint DataHeaderNum=96;
    gint value2=value+DataHeaderNum;
    text2 = g_substr(contents,value,value2);        

    gchar *filler;
    filler=g_strnfill (DataHeaderNum,'0');
    //g_print(filler);
    gint DataNum=2048-DataHeaderNum;
    gint value3=value2+DataNum;
    text3 = g_substr(contents,value,value3);
    g_strlcat(filler,text3,2048);
    text3=g_strdup(filler);
    //g_print(text3);


    gchar *full;
gchar *name="SpaceCraftHeader";
gchar *name2="DataHeader";
gchar *name3="Data";

full=g_strdup(filename);
g_strlcat(full,name,50);

GFile *file=g_file_new_for_path(full);
GFileOutputStream *output=g_file_replace(
            file,NULL,FALSE,
            G_FILE_CREATE_NONE,
            NULL,NULL);

g_output_stream_write(G_OUTPUT_STREAM(output),
            text1,strlen(text1),NULL,NULL);

g_output_stream_close(G_OUTPUT_STREAM(output),NULL,NULL);
}

Posted 14-Jun-16 23:29pm

AlibiOfHumanity

Updated 15-Jun-16 0:22am

CPallini

v2

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Jochen Arndt · Answer 1 · 2016-06-15T00:22:00

You are using string related functions in your code. These will of course stop at null bytes which are used to indicate the end of string.

If you want to process binary data you can use standard C file IO functions like the FILE based functions (fopen, fclose, fread, fwrite) or the file descriptor based functions (open, close, read, write).

If the files are not too big it is common to determine the file size, allocate a buffer with that size (usually of a byte type like unsigned char) and read the whole content into that buffer.