This is my code for screenshot to save in library or do email. The problem is, it is working perfectly in Simulator but when i run this code in Device whatever on screen it only gets white image. I have tried with iOS 5 and iOS 6 both but no luck What should be the reason Where i am wrong
NSInteger myDataLength = 320 * 430 * 4;
GLubyte *buffer1 = (GLubyte *) malloc(myDataLength);
GLubyte *buffer2 = (GLubyte *) malloc(myDataLength);
//Read image memory form OpenGL
glReadPixels(0, 50, 320, 430, GL_RGBA, GL_UNSIGNED_BYTE, buffer1);
//Invert result image buffer into secondary buffer
for(int y = 0; y < 430; y++) {
for(int x = 0; x < 320 * 4; x++) {
buffer2[(429 - y) * 320 * 4 + x] = buffer1[y * 4 * 320 + x];
}
}
//Create bitmap context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef destContext = CGBitmapContextCreate(buffer2, 320, 430, 8, 320 * 4, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
//Get image from context
CGImageRef resultContext = CGBitmapContextCreateImage(destContext);
UIImage *resultImg = [UIImage imageWithCGImage: resultContext];
CGImageRelease(resultContext);
//Send to mail or Save to PhotoLibrary
if (sendMail) {
[self emailImage: resultImg];
} else {
UIImageWriteToSavedPhotosAlbum(resultImg, nil, nil, nil);
}
//Release allocated memory
// [resultImg release];
free(buffer2);
free(buffer1);
CGContextRelease(destContext);
CGColorSpaceRelease(colorSpace);
is there any class i am using which is supported by Simulator and not the device If it so then which one because as far as i search i found nothing like that.
I have found that My above code is perfect and the issue is not lie here.actually the problem is with
eaglLayer.drawableProperties
I have changed from this code
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:NO],
kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGB565,
kEAGLDrawablePropertyColorFormat, nil];
To this
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES],
kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGB565,
kEAGLDrawablePropertyColorFormat, nil];
I just set
kEAGLDrawablePropertyRetainedBacking = YES
And thanks GOD it is working fine. but dont know why if any one know please let me know
try this one, it works perfect for me on the device:
+ (UIImage *)imageFromView:(UIView *)view inRect:(CGRect)rect {
CGFloat screenScale = [[UIScreen mainScreen] scale];
if ([view respondsToSelector:@selector(contentSize)]) {
UIScrollView *scrollView = (UIScrollView *)view;
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, NO, screenScale);
} else {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, screenScale);
}
CGContextRef resizedContext = UIGraphicsGetCurrentContext();
[view.layer renderInContext:resizedContext];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
image = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(image.CGImage, CGRectMake(rect.origin.x*screenScale, rect.origin.y*screenScale, rect.size.width*screenScale, rect.size.height*screenScale))];
UIGraphicsEndImageContext();
return [image imageScaledToSize:CGSizeMake(rect.size.width, rect.size.height)];
}
- (UIImage *)imageScaledToSize:(CGSize)newSize {
if ((self.size.width == newSize.width) && (self.size.height == newSize.height)) {
return self;
}
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
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