kíu em về cái vụ Webcam

bàc thư? copy cài nà?y và?o notepad rĂ?i save thà?nh file ini xem sao
http://trac.koka-in.org/libdecodeqr/changeset/41?format=zip

hoặc đây xem, em cufng cha? biết nhưng seart thấy cái maf nó
/////////////////////////////////////////////////////////////////////////
//
// webcam.cpp --a part of libdecodeqr
//
// Copyright(C) 2007 NISHI Takao <zophos@koka-in.org>
// JMA (Japan Medical Association)
// NaCl (Network Applied Communication Laboratory Ltd.)
//
// This is free software with ABSOLUTELY NO WARRANTY.
// You can redistribute and/or modify it under the terms of LGPL.
//
// $Id$
//
#include <stdio.h>
#include <string.h>
#include <highgui.h>
#include "../../libdecodeqr/decodeqr.h"
int usage(char *program_name);
int main(int argc,char *argv[])
{
int show_bin_image=0;
if(argc>1){
if(strcmp(argv[1],"-d"))
return(usage(argv[0]));
else
show_bin_image=1;
}
//
// start camera
//
CvCapture *capture=cvCaptureFromCAM(0);
if(!capture)
return(-1);
//
// initialize qr decoder
//
QrDecoderHandle decoder=qr_decoder_open();
printf("libdecodeqr version %s
",qr_decoder_version());

cvNamedWindow("src",1);
if(show_bin_image)
cvNamedWindow("bin",1);
puts("Hit [SPACE] key to grab, or any key to end.");
puts("");
//
// 1 shot grabing
//
//
// allocate grabed buffer to decoder
//
int key=-1;
IplImage *camera=cvQueryFrame(capture);
IplImage *src=NULL,*bin=NULL;
if(camera){
src=c***oneImage(camera);
qr_decoder_set_image_buffer(decoder,src);
}
else
key=1;
unsigned char *text=NULL;
int text_size=0;
while(key<=0){
cvShowImage("src",camera);
key=cvWaitKey(150);
//
// when [SPACE] key pressed, do decode.
//
if(key==0x20&&!qr_decoder_is_busy(decoder)){
key=-1;
//
// if left-bottom origin (MS-Windows style) format,
// it must be converted to left-top origin.
//
if(camera->origin)
cvConvertImage(camera,src,CV_CVTIMG_FLIP);
else
cvCopy(camera,src);
//
// While decoding is a failure, decrease the
// adaptive_th_size parameter.
// Note that the adaptive_th_size must be odd.
//
short sz,stat;
for(sz=25,stat=0;
(sz>=3)&&((stat&QR_IMAGEREADER_DECODED)==0);
sz-=2)
stat=qr_decoder_decode(decoder,sz);
//
// for debug, show binarized image.
//
if(bin)
cvReleaseImage(&bin);
if(show_bin_image){
bin=c***oneImage(qr_decoder_get_binarized_image_buffer(decoder));
cvShowImage("bin",bin);
}
printf("adaptive_th_size=%d, status=%04x
",sz,stat);
//
// on suceed decoding, print decoded text.
//
QrCodeHeader header;
if(qr_decoder_get_header(decoder,&header)){
if(text_size<header.byte_size+1){
if(text)
delete text;

text_size=header.byte_size+1;
text=new unsigned char[text_size];
}
qr_decoder_get_body(decoder,text,text_size);
printf("%s

",text);
//
// draw found code region with green line
//
CvPoint *vertexes=qr_decoder_get_coderegion_vertexes(decoder);
CvPoint pt=vertexes[3];
int i;
for(i=0;i<4;i++){
cvLine(src,pt,vertexes,CV_RGB(0,255,0),3);
pt=vertexes;
}
//
// draw found finder patterns with green ellipse
//
CvBox2D *boxes=qr_decoder_get_finderpattern_boxes(decoder);
for(i=0;i<3;i++){
CvSize sz=cvSize((int)boxes.size.width/2,
(int)boxes.size.height/2);
cvEllipse(src,
cvPointFrom32f(boxes.center),
sz,
boxes.angle,
0,360,
CV_RGB(0,255,0),2);
}
if(src->origin)
cvConvertImage(src,src,CV_CVTIMG_FLIP);
cvShowImage("src",src);
//
// wait 1500msec.
//
key=cvWaitKey(1500);
}
}
camera=cvQueryFrame(capture);
if(!camera)
break;
}

if(text)
delete text;
qr_decoder_close(decoder);
if(bin)
cvReleaseImage(&bin);
if(src)
cvReleaseImage(&src);

cvReleaseCapture(&capture);
return(0);
}
int usage(char *program_name)
{
fprintf(stderr,"usage: %s [-d|-h]
",program_name);
fprintf(stderr,"-d turn on debug mode.
");
fprintf(stderr,"-h show thismessage and quit.

");

return(-1);
}

http://download.duclinhco.com/webcamtako-02.zip
Link down đấy. Cài thử xem nhé.