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POWrite a JPG image file in C
 

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  1. POWrite a JPG image file in C
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    <p>I read JPEG image file and store its bits to a text file. Now I wanna convert back to valid JPEG image using those bits in the text file. I have tried writing a binary file but it doesn't retrieve the image file.</p> <p>Please steer me to the right direction. I'm busting my head into this for couple of days but no luck so far.</p> <p>Here is my code for writing JPG file:</p> <pre><code>int length; unsigned char *inData; char Buffer[9]; int c = 0, x; /* file.txt has single bit per line. */ FILE *reader = fopen(file.txt, "r"); FILE *writer = fopen("output.JPG","wb"); fseek(reader, 0, SEEK_END); length=ftell(reader); fseek(reader, 0, SEEK_SET); for(x=0; x &lt; length; x++){ fscanf(reader, "%d", &amp;inData); if(c &lt;= 8){ /* reading 8-bits */ Buffer[c] = inData; } else { fwrite(&amp;Buffer, sizeof(Buffer), 1, writer); c = 0; } c++; } fclose(reader); fclose(writer); </code></pre> <p>Here is the code snippet for reading input.JPG and writing its bits to file.txt</p> <pre><code> char *buffer; int fileLen; FILE *file = fopen("inputIM.JPG", "rb"); fseek(file, 0, SEEK_END); fileLen=ftell(file); fseek(file, 0, SEEK_SET); buffer=(char *)malloc(fileLen+1); fread(buffer, fileLen, 1, file); fclose(file); convertToBit(&amp;buffer, fileLen); free(buffer); } // convert buffer data to bits and write them to a text file convertToBit(void *buffer, int length) { int c=0; int SIZE = length * 8; unsigned char bits[SIZE + 1]; unsigned char mask = 1; unsigned char byte ; int i = 0; FILE *bitWRT = fopen("file.txt", "w"); for (c=0;c&lt;length;c++) { byte = ((char *)&amp;buffer)[c]; for(i = 0; i &lt; 8; i++){ bits[i] = (byte &gt;&gt; i) &amp; mask; fprintf(bitWRT, "%d\n", bits[i]); } } fclose(bitWRT); } </code></pre> <p>Thanks,</p> <p>-Sam</p>
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    1. USSam
    1. USSam
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      1. POWrite a JPG image file in C
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      1. VTUpMod
    1. CO"Store its bits" means? Can you show us your code where you are reading your jpeg image and writing it into text file?
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      1. POWrite a JPG image file in C
      1. USPavan Manjunath
    2. COWithout seeing your code, we cannot tell you what you're doing wrong. My suggestion would be to compare the original input file and the output file, to discover where the differences lay.
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      1. POWrite a JPG image file in C
      1. USOliver Charlesworth
    3. COI have added code snippet. output.JPG is a corrupted image file. Where Am I getting wrong.
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      1. POWrite a JPG image file in C
      1. USSam
 

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