Converting Hex String to Bmp file

[tawanda diza]

hie Team.

here is my scenario:

1. i managed to convert a bmp image file to hex and then sending it to a server.
see the following code

fp = fopen("\\C\\photo.bmp","rb");
            fseek(fp,0,SEEK_END); //go to end
            PicLen = ftell(fp); //get position at end (length)
            PICBuffer = (byte *)malloc(PicLen); //malloc buffer
            fseek(fp,0,SEEK_SET); //go to beg.
            fread(PICBuffer,PicLen,1,fp); //read into buffer
            fclose(fp);
            i=0;
 
            do
            {
 
                sprintf(temp,"%02x",PICBuffer[i]);
                strcat(ReqInfo.Pic,temp);
                i+=1;
 
            }
            while(i<PicLen);
 

2. now the server is returning back those hex values and i want to convert them back to the original bmp image file.



Thanks in advance

[johny10151981]

Do you really know how you converted from BMP to Hexa value??

Extracting will be follow the same rule

[tawanda diza]

johny10151981:

yes i do. I am actually converting it back to a BMP image, but my picture doesnt look good at all, when i compare the hex values of my original picture and the one i create when i convert from hex to BMP, there is this "D0D0" in my converted output picture.

i think im not writinhg it correctly:

see illustration below, i have extractracted the first few hex values for the two pictures:

original picture hex values:
FFD8FFE000104A46494600010100000100010000FFDB004300 100B0C0E0C0A100E0D0E1211101318281A181616183123251D 283A333D3C3933383740485C

my converted picture hex values:
FFD8FFE000104A46494600010100000100010000FFDB004300 100B0C0E0C0D0D0A100E0D0E1211101318281A181616183123251D283A333D3C3 9

can you see the D0D0 values in the second one.

thanks