[英]EXC_BAD_ACCESS on iOS 6 but not 5 when changing bytes of a CFDataRef
I have an application that applies various filters to an image. 我有一个将各种滤镜应用于图像的应用程序。 It works great on iOS 5 but crashes on 6. Below is a sample of where it's crashing:
它在iOS 5上运行良好,但在6上崩溃。下面是崩溃的示例:
CGImageRef inImage = self.CGImage;
CFDataRef m_DataRef = CGDataProviderCopyData(CGImageGetDataProvider(inImage));
UInt8 * m_PixelBuf = (UInt8 *) CFDataGetBytePtr(m_DataRef);
int length = CFDataGetLength(m_DataRef);
for (int i=0; i<length; i+=4)
{
if(filter == filterCurve){
int r = i;
int g = i+1;
int b = i+2;
int red = m_PixelBuf[r];
int green = m_PixelBuf[g];
int blue = m_PixelBuf[b];
m_PixelBuf[r] = SAFECOLOR(red); // <==== EXC_BAD_ACCESS (code = 2)
m_PixelBuf[g] = SAFECOLOR(green);
m_PixelBuf[b] = SAFECOLOR(blue);
}
}
Notice the bad access point when I try to assign a value back to m_PixelBuf
. 当我尝试将值分配回
m_PixelBuf
时,请注意错误的访问点。 Anybody have any idea why this is occuring? 有人知道为什么会这样吗? What in iOS 6 would cause this?
在iOS 6中会导致什么?
This solves the problem: http://www.iphonedevsdk.com/forum/iphone-sdk-development/108072-exc_bad_access-in-ios-6-but-not-in-ios-5.html 这样可以解决问题: http : //www.iphonedevsdk.com/forum/iphone-sdk-development/108072-exc_bad_access-in-ios-6-but-not-in-ios-5.html
In iOS 6 you need to use CFDataCreateMutableCopy()
(instead of CGDataProviderCopyData()
), followed by CFDataGetMutableBytePtr()
(instead of CFDataGetBytePtr()
) if you're going to be manipulating the data's bytes directly. 在iOS 6中,如果要直接操作数据的字节,则需要使用
CFDataCreateMutableCopy()
(而不是CGDataProviderCopyData()
),然后是CFDataGetMutableBytePtr()
(而不是CFDataGetBytePtr()
)。
这是您在其中找到适用于ios 6的新类的URL:https://github.com/kypselia/ios-image-filters/blob/6ef9a937a931f32dd0b7b5e5bbdca6cce2f690dc/Classes/ImageFilter.m
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