QImage: out of memory, returning null image,How slove the this problem?
-
When running the application,The Application Output often output the information about "QImage: out of memory, returning null image",BTW,the application could run successfully.The involved code like this :
uchar *pBuffer = new uchar[size];//the size very large
QImage dataImg(pBuffer, width, height, QImage::Format_RGB888);//one image size is about 110M
emit sendImage(dataImg);
//the above code in the standalone thread
//receive the signal in the UI thread, when the error come out, I lost the Image.
// Also, I try emit the pBuffer, construct the image in UI thread, but not helping, same problem.
-
@hurely Do you write anything into pBuffer?
"the size very large" - how large?
What are the values for width and height?
Also do you free the memory at some point (pBuffer, QImage will not free it as described in the documentation)?
-
Thanks for reply!!!
The size of image, about 110M. width:7376, height:4928.
The pBuffer receive the RAW data from camera, so Image is large.
I have already tried to free the memory after "emit sendImage(dataImg);",but UI show nothing, seem like that lost the image.
-
@jsulm Thanks for reply!!!
The size of image, about 110M. width:7376, height:4928.
The pBuffer receive the RAW data from camera, so Image is large.
I have already tried to free the memory after "emit sendImage(dataImg);",but UI show nothing, seem like that lost the image.
-
@hurely You should not free the memory as long as the image is used as this buffer is used by QImage as stated in the documentation.
-
Hi,
In addition to what @jsulm wrote:
- On what platform are you running your application on ?
- What's the FPS ?
- What are the specs of the device/machine you are running your application on ?
-
@SGaist Thanks for your reply!!!
The Development Platform is PC windows 7 and running application on this platform.
The FPS is about 5.
I have already tested that showed one image on UI, the error didn't come out.
I think the FPS is the key to this error, Is it too fast about emitting the QImage to UI thread?
-
Well, it depends on several factors. What else does your application do ? What else consumes memory ? Are you running a 32bit application ?
