C :: Why File Size Of BMP Always Zero
Oct 6, 2013
I've been looking into the file structure of BMP images and everything I'm reading says that the 4 bytes following the signature are designated as the filesize of the bmp file... It's always zero for me regardless of the BMP file. The signature is always correct though.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
[Code]....
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Feb 17, 2015
I am interested in creating a file of a given size and then randomly accessing the file to populate it. Is there a way to quickly create, for instance, a 4 GByte file in C++, initially populated with garbage?
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Nov 27, 2012
Change the frame window size according to font size increases.
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Sep 7, 2014
I finally accomplished what I'd asked for earlier.
I'm able to input data from txt file to c++ array.
the Text file contains around 60,000 lines "numbers" to be loaded into a c++ array to calculate some stuff.
I'm able to load 60,000 lines "txt file size 1.1MB" no problem, but sometimes when I try to load more lines "from a file around 1.4MB", the process terminates and gives me an error message "n.exe has stopped working, Windows is checking a solution to this problem" and Code::Block shows error "Process terminated with status -1073741819 "
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Feb 1, 2013
I must take an old MFC project in VC++ 6.0 and make changes.
The problem is text size in screen is different from size in print preview.
for example with this font
Code:
CFont f50;
f50.CreateFont(100,0,0,0,FW_BOLD,0,0,0,DEFAULT_CHARSET,OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,FF_DONTCARE,"Frutiger LT Std 45 Light");
And this text
Code:
s=_T("Let's try to calculate the size of this text");
and with MM_LOMETRIC map mode
GetTextExtent() returns me:
On screen: (1595,99)
Ink printer + print preview: (1589,100)
PDFCreator + print preview: (1580,100)
comparing with screen size the height is bigger but lenght is smaller. I don't understand.
I can understand that different printers process the fonts in different way and then to have different lenghts. That's not the problem. The problem is I need to simulate in screen the same behaviour i will have on printer because these texts are being aligned in the document, and I don't want to see that the text si aligned different in text than in paper.
What can I do to render the text on screen with the same size I will have on the printer? Print preview is doing it. Should I change the font parameters? is something related with pixels per inch?
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Nov 29, 2013
I was wonder if I can make 2 different size structures in a file. I wrote a code but It's apart of my school project and I havent compiled it yet, so Im just wondering will this work?
Code:
if((stsPtr = fopen("status.dat", "rb")) == NULL){
prinft("File could not be created/opened.
");
Error();
[Code] .....
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Jan 2, 2013
I am trying to create an array with the size of the first value of one file wich is the same of the first line because the first line only have one value. Here is how i am trying to do it ...
FILE * fich;
int test;
fich=fopen(nome_ficheiro,"r");
fscanf_s(fich,"%d",&test);
int np=test;
No*aux=primeiro;
[Code] .....
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Jan 13, 2015
I have been given a task of checking the size of file in Linux machine using C Program. Below is what I came up with
Code:
#include <stdio.h>
void main(int argc, char **argv) {
FILE *fp;
char ch;
int size = 0;
[Code] .....
But Now I have been asked to modify this code in a way that instead of passing the file name as parameter, I have to make a database connection and fetch the value of the filename and location from the database table and check the size . My program has to repeat this process every ten minutes, which means every ten minutes my program has to hit the database, fetch the value and check the size in the file system.
I heard like I Have to create a Fork Call, and have the child instance run every ten minutes.
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Oct 22, 2013
I'm doing a Text-based RPG game and it will include some checkpoints, on those checkpoints the game will save the progress, so I need to write all my variables to a text file and then read them all when the player loads the game.
Some of my variables, like enemyNames, dont have any determined size, they're like this: "int enemyNames[];"
So how do I write an array to a text file without determining a size?
And how do I read them when the player loads the game?
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Apr 11, 2013
My sample.h is
#include <string>
namespace xxx
{
class abc
[Code]....
My Question is when i compile this code in Linux platform Using g++ compiler My sample.o's Size is 1Kb.. But when the same code is compiled in Windows platform using VC++ Compiler , My sample.o's size is 42Kb..to reduce the size in windows... Is there any proble with '#include <string>' in Windows platform.
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Feb 24, 2012
Where i can get ready function, which return string, which describe size of file?
For example
4 = 4 b
1045 = 1,01 Kb
and etc.
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Jul 11, 2013
I was wondering why, in C, the sizeof of a struct is larger than the the sum of all the sizeofs of it's members. It only seems to be by a few bytes, but as a bit of a perfectionist I fine this a bit annoying.
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Feb 9, 2015
I'd wrote a program to encrypt a message within a bmp file using my own structs and all for everything (yes, call me a ........head) The program works but for some weird ........ing reason I was forced to subtract 2 bytes from the header size to get the correct value. I've narrowed down the issue to my BmpFileHeader struct.
Here's a short program that demonstrates the issue:
Code:
#include <stdio.h>
#include <stdlib.h>
#define BYTE unsigned char
#define WORD unsigned short
#define DWORD unsigned long
#define LONG signed int
[Code] .....
Tried with both gcc and TinyCC and got the same result so it doesent seem to be a compiler bug. Microsoft's structures though are giving the correct size, even though they have the exact same definition.
Microsoft's defines:
Code:
// windef.h
typedef unsigned long DWORD;
typedef unsigned char BYTE;
typedef unsigned short WORD;
[Code] .....
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Dec 23, 2013
A process is writing data continuously to a file . I need to stop the write operation if the file size has reached 1GB. Is there any way to check file size when it is opened for the write operation.
I could do the same using scripts. Can this be done using C Programming ?
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Sep 10, 2014
I have an idea which i will try to implement in C++,I want to compress file size through making my own numbering system which is 80-based number, I do really want to know whether this even possible ? I learnet that Hexadecimal uses symbols like A, B, C, D, E, F to represent 10,11,12,13,14,15 -- and that's what i want to do to my own numbering system but in a bigger scale .if possible: How can i use C++ to open a file in Hex mode ?
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Apr 10, 2013
how to split a file in equal size and when clicking on split button it split the files as well as encrypt split parts and the size information are automatically stored in groupbox and save all splitted files in folder.
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Nov 26, 2014
// my size is not decreasing when I erase a record.
//dvr_hwch.cpp
#include <iostream>
#include <iomanip>
#include <cassert>
using namespace std;
#include "hash_chn.h"
void print_menu( );
[Code] .....
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Oct 20, 2014
Goal:
Read contents from a file and use as the size of a 2d array.
Problem:
C2087: Line 27 : "a1" : missing subscript
C2133: Line 27 : "a1" : unknown size
Code :
int rows;
int columns;
ifstream fObject("inputdata.dat");
fObject>>rows;
fObject>>columns;
char a1[rows][columns];
I am not sure why this is occurring, or if there is a better way to do it.
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Aug 17, 2014
I am trying to read a file line by line and then do something with the informations, so my method looks like this:
Code:
void open_file(char *link) {
FILE *file = fopen(link, "r");
if (file == NULL) {
fprintf(stderr, "Could not open file.
");
exit(EXIT_FAILURE);
[Code] ....
1) The first complain of valgrind is at the line where I use fgets and its telling me (invalid write of size x), but I have allocated my line to 56000 and the read line is shorter, why is there a write size error then :S?
2) at the line where I realloc where I try to shrink the space he's telling me: Address .... is 0 bytes inside a block of size 56000, But I know i need only this space so why is there a write over space error :S??
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Oct 27, 2014
I'm trying to put all of the words in a text document into an array but this text document is 2,138 kb, and when my program is crashing when I try to put it into an string array. Could the file be too big to put into the array?
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Nov 10, 2014
The problem is with that a. What is it, a pointer? What's the difference between the a in the main function and the a in the function?
#include <iostream>
#include "Header.h"
using namespace std;
short int capacity(int* a) {
int capacity;
[Code] ....
The function it returns i think the size of the pointer instead of returning the size of my array. I don't think i fully understood pointer arithmetic.
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Sep 26, 2014
How can I see the actual byte size of the pointer as output in the command prompt?
#include <iostream>
using namespace std;
int main () {
[Code].....
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Jun 12, 2014
Here is what I've tried:
int numbers[] = {8, 2, 0, 4, 100, 5};
for(int i = 0; i < sizeof(numbers); i++){
cout << numbers[i] << endl;
}
However the results in the console is: 8 2 0 4 ,What am I doing wrong? Am I using the wrong built in function or something? I googled this and one of the links that came up stated to just do something like
arrayName.size()
but that didnt work for me either...
[URL]
Also, I know that I just enter the size of the list manually, in this case make i < 6 but I still want to know if there is a built in function or something.
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Mar 12, 2012
what is the size of integer in dos?
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May 19, 2013
how am i supposed to alter font size of text which appear in output screen?
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Oct 12, 2014
I am not sure why I am receiving the error message:
Error C2466: cannot allocate an array of constant size 0
When I run the code:
Code:
int s;
cout<<"Enter the size:
";
cin>>s;
int array[s];
C++ masters,
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