问题
I am using a WebFrame to load a request to a website that is running Microsoft SilverLight. When I build my application using the 64-bit Intel architecture (x86_64), it runs fine. However, because I must use a third party library built for 32-bit Intel, I must build my application using that architecture. When I do that, I get the following error message
<Error>: clip: empty path.
prior to a second call to
- (void) webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame
and my application eventually crashes or hangs.
Has anyone experienced this problem and know what the issue may be? Is there some reason why this only happens when building for the 32-bit Intel architecture?
For what it's worth, here is a stack trace of the crash:
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x000000007cabac94
VM Regions Near 0x7cabac94:
MALLOC_TINY 000000007c800000-000000007ca00000 [ 2048K] rw-/rwx SM=PRV
--> MALLOC_TINY 000000007ca00000-000000007cb00000 [ 1024K] rw-/rwx SM=COW
MALLOC_TINY 000000007cb00000-000000007cc00000 [ 1024K] rw-/rwx SM=PRV
Application Specific Information:
objc[44662]: garbage collection is OFF
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 ??? 0x7cabac94 0 + 2091625620
1 com.microsoft.net.coreclr 0x0aaea95e GetCLRRuntimeHost + 220078
2 com.microsoft.net.coreclr 0x0aa2c23e MetaDataGetDispenser + 1383214
3 com.microsoft.net.coreclr 0x0ad799e3 PAL_InitializeCoreCLR + 57795
4 com.microsoft.net.coreclr 0x0aa2b1c5 MetaDataGetDispenser + 1378997
5 com.microsoft.net.coreclr 0x0aa2b49f MetaDataGetDispenser + 1379727
6 com.microsoft.net.coreclr 0x0aa2b60b MetaDataGetDispenser + 1380091
7 com.microsoft.net.coreclr 0x0aab3630 MetaDataGetDispenser + 1937184
8 com.microsoft.net.coreclr 0x0aab4f67 GetCLRRuntimeHost + 439
9 com.microsoft.SilverlightPlugin 0x09499a57 UI_GetSaveFileName + 37895
10 com.microsoft.SilverlightPlugin 0x093e5858 ippiDCTQuantInv8x8LS_JPEG_16s8u_C1R_SSE + 4824
11 com.microsoft.SilverlightPlugin 0x08cb7dc1 main + 769249
12 com.microsoft.SilverlightPlugin 0x09480ad7 LocalMessageReceive + 308343
13 com.microsoft.SilverlightPlugin 0x092789a1 PopupRoot_GetOpenPopups + 427361
14 com.microsoft.SilverlightPlugin 0x09273a65 PopupRoot_GetOpenPopups + 407077
15 com.microsoft.SilverlightPlugin 0x0925d8a6 PopupRoot_GetOpenPopups + 316518
16 com.microsoft.SilverlightPlugin 0x0925db19 PopupRoot_GetOpenPopups + 317145
17 com.apple.CoreFoundation 0x9c8667be __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
18 com.apple.CoreFoundation 0x9c8666fd __CFRunLoopDoObservers + 413
19 com.apple.CoreFoundation 0x9c838917 CFRunLoopRunSpecific + 375
20 com.apple.CoreFoundation 0x9c838798 CFRunLoopRunInMode + 120
21 com.apple.HIToolbox 0x97b91a7f RunCurrentEventLoopInMode + 318
22 com.apple.HIToolbox 0x97b98d9b ReceiveNextEventCommon + 381
23 com.apple.HIToolbox 0x97b98c0a BlockUntilNextEventMatchingListInMode + 88
24 com.apple.AppKit 0x9b358040 _DPSNextEvent + 678
25 com.apple.AppKit 0x9b3578ab -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 113
26 com.apple.AppKit 0x9b353c22 -[NSApplication run] + 911
27 com.apple.AppKit 0x9b5e818a NSApplicationMain + 1054
28 com.Vigience.TestBrowser 0x0009be09 start + 53
回答1:
I am wondering if you are getting hit by issue 1 that I outlined in my answer over here. I see that you are not using Mono, but you are using webView, and the crash stack looks very similar. In similar cases, a number of us have had luck with changing the useragent string...
来源：https://stackoverflow.com/questions/8120863/loading-a-silverlight-website-in-a-webframe-when-built-for-32-bit-intel-architec