manuelf
asked on
How to display a GIF/JPEG file from a CGI in visualc++?
I am writing a really small cgi in visualc++ that has the only purpose of displaying a gif (or jpeg) file.
I read the file in binary and then I send the "Content-Type: image/gif" header followed by the binary data.
When I run the cgi from Internet Explorer it doesn't display the image correctly. It does display an image but it is way different from the original image (looks like noise).
I wonder if anyone can help me out here. I don't know what the problem is, since the content type header is OK and I think I am reading the file correctly (I write an output file that looks exactly the same as the original file).
I have found perl scripts that do this but I need to do it in visualc++ (windows).
I read the file in binary and then I send the "Content-Type: image/gif" header followed by the binary data.
When I run the cgi from Internet Explorer it doesn't display the image correctly. It does display an image but it is way different from the original image (looks like noise).
I wonder if anyone can help me out here. I don't know what the problem is, since the content type header is OK and I think I am reading the file correctly (I write an output file that looks exactly the same as the original file).
I have found perl scripts that do this but I need to do it in visualc++ (windows).
ASKER CERTIFIED SOLUTION
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ASKER
I did what you said but it didn't work. Actually, I had already tried that before. Any other suggestions?
The program listed below SHOWS the picture contained in "TIA1.GIF" ( current dir ) , and works in VC 5.0 :
#include <windows.h>
#include <iostream.h>
#include <fstream.h>
void saca(char *s)
{
cout << "Content-type: text/html\n\n" ;
cout << "<html>\n<head><title>ruin
cout << "</head>\n<body>\n<h1>" << s << "\n";
cout << "</h1>\n</body>\n</html>\n
}
void main(int argc, char **argv)
{ char *buf = new char [ 256 ];
ifstream fich("TIA1.GIF",ios::in|io
if(fich.bad())
{ saca("OPEN FILE ERROR");exit(1);
}
cout << binary;
cout << "HTTP/1.0 200 OK\n" ;
cout << "Content-type: image/gif\n\n" ;
while(!fich.eof())
{ fich.read(buf,255);
cout.write(buf,255); # chapuza : better fich.gcount() |
}
cout << text ;
delete [] buf ;
exit(0);
}
#include <windows.h>
#include <iostream.h>
#include <fstream.h>
void saca(char *s)
{
cout << "Content-type: text/html\n\n" ;
cout << "<html>\n<head><title>ruin
cout << "</head>\n<body>\n<h1>" << s << "\n";
cout << "</h1>\n</body>\n</html>\n
}
void main(int argc, char **argv)
{ char *buf = new char [ 256 ];
ifstream fich("TIA1.GIF",ios::in|io
if(fich.bad())
{ saca("OPEN FILE ERROR");exit(1);
}
cout << binary;
cout << "HTTP/1.0 200 OK\n" ;
cout << "Content-type: image/gif\n\n" ;
while(!fich.eof())
{ fich.read(buf,255);
cout.write(buf,255); # chapuza : better fich.gcount() |
}
cout << text ;
delete [] buf ;
exit(0);
}
ASKER
I would like to thank Aurelio a lot for the c program he added as a comment, for it worked perfectly and saved my life.
Aurelio, muchísimas gracias por el programa que me diste, me salvaste la vida. Te doy mi mail para estar en contacto: alfonsof@reforma.com.mx. Saludos, paisano!!!
Aurelio, muchísimas gracias por el programa que me diste, me salvaste la vida. Te doy mi mail para estar en contacto: alfonsof@reforma.com.mx. Saludos, paisano!!!
perhaps there are problems with ios::binary , buffering or so.
Inspect the output with pc-tools or debug and be sure it is what you expect.
If it dont work , post another comment and i´ll send you a C program.
hasta luego lucas!