//刚开始我一直以为imageData里面会有负数，后来发现自己错了，但是会有0存在
void main() {
int i , j;
long k;
char *BGRData;
IplImage * image = cvLoadImage( "lena.jpg" , 1 );
IplImage *iplImage = cvCreateImage(cvGetSize(image),image->depth,image->nChannels);
/*//方法一：
for( j = 0 ; j < image -> height ; j ++ ) {
for( i = 0 ; i < image -> width ; i ++ ) {
( ( iplImage -> imageData + j * image -> widthStep ) ) [ i * iplImage -> nChannels ]
= ( ( image -> imageData + j * image -> widthStep ) ) [ i * image -> nChannels ];
( ( iplImage -> imageData + j * image -> widthStep ) ) [ i * iplImage -> nChannels + 1]
=((image -> imageData+j*image->widthStep))[i*image->nChannels+1];
( ( iplImage -> imageData + j * image -> widthStep ) ) [ i * iplImage -> nChannels +2 ]
=((image -> imageData+j*image->widthStep))[i*image->nChannels+2];
}
}
*/
/*//方法二：
for( k = 0 ; k < image -> height * image -> widthStep ; k ++ ) {
iplImage -> imageData[ k ] = image -> imageData[ k ];
}
*/
/*//方法三：
cvSetData( iplImage , image -> imageData , iplImage -> widthStep );
*/
////方法四：
BGRData = ( char * ) malloc ( image -> height * image -> widthStep * sizeof( char ) );
for( k = 0 ; k < image -> height * image -> widthStep ; k ++ ) {
BGRData[ k ] = image -> imageData[ k ];
}
cvSetData( iplImage , BGRData , iplImage -> widthStep );
cvShowImage( "image" , image );
cvShowImage( "iplImage" , iplImage );
cvWaitKey( 100000 );
}