GTK+ Forums

Hello All,

I am a new GTK user, and I would be grateful if someone will find time to help me.
Lets say that I receive an iplImage (opencv parameter), and my goal is to show this image in a GTK/GDK window/widget.
I have written this code, but I am not able to see the image inside a widget (nothing appears on the screen):

GtkWidget* convertOpenCv2Gtk (IplImage* srcImage)
{
GtkWidget* gtkImg = NULL;
GdkPixbuf* gtkPixbuf = NULL;
IplImage* dstImage = NULL;

/** Creating the destionation image */
dstImage = cvCreateImage( cvSize(srcImage->width,srcImage->height), IPL_DEPTH_8U, 3);

/** Converting the format of the picture from BGR to RGB */
cvCvtColor ( srcImage, dstImage, CV_BGR2RGB );

/** Creates a new GdkPixbuf out of in-memory image data */
gtkPixbuf = gdk_pixbuf_new_from_data ( (guchar*)dstImage->imageData,
GDK_COLORSPACE_RGB,
FALSE,
dstImage->depth,
dstImage->width,
dstImage->height,
(dstImage->widthStep),
NULL,
NULL
);

/** Create new GtkImage displaying pixbuf */
gtkImg = gtk_image_new_from_pixbuf ( gtkPixbuf );
return gtkImg;
}

In the main function I am just trying to show the received widget:

gtkWindow = convertOpenCv2Gtk ( iplImage );
gtk_widget_queue_draw ( gtkWindow );

Why it doesn´t works?
What wrong have I done?
What parts are missing?

Thanks in advance to you all :),
Felix.

Hello All,

Please do not answer all together, I can´t read so many answers ;).
Please remember, that you also have started once...

Thanks again,
Felix.

Hi,

I am joining the stampede of answers here ;-)

I have not used opencv before so can not answer specifics on opencv. You have shown a function to convert the opencv image to a GtkImage widget. I am going to have to assume that that code is correct!!!!! If not you could try placing a temporary known GtkWidget there to see it that works. What you do not describe is where and how you place the widget so that it could be seen. The use of gtk_widget_queue_draw() is also odd as normally it is not needed.

E.

_________________
E.

Hello Errol,

Thank you for your will to help.
Anyway, I have solved this problem by myself.

Best,
Felix.