Iphone 调试构建运行良好,临时构建很难崩溃
我在与EXIF库合作,我遇到了一个真正令人头痛的bug。当我在调试构建中实现该库时,一切都运行得很好,但当我编译以进行临时beta测试时,应用程序很难崩溃 我得到以下错误:Iphone 调试构建运行良好,临时构建很难崩溃,iphone,objective-c,memory-management,debugging,gpsignaturefile,Iphone,Objective C,Memory Management,Debugging,Gpsignaturefile,我在与EXIF库合作,我遇到了一个真正令人头痛的bug。当我在调试构建中实现该库时,一切都运行得很好,但当我编译以进行临时beta测试时,应用程序很难崩溃 我得到以下错误: Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000 Crashed Thread: 5 对于螺纹5: 0 Gaia GPS 0x000
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000
Crashed Thread: 5
对于螺纹5:
0 Gaia GPS 0x000494e4 -[EXFJpeg scanImageData:] (EXFJpeg.m:372)
1 Gaia GPS 0x0000524c -[MyAppDelegate saveImage:] (MyAppDelegate.m:935)
2 Foundation 0x317fef32 0x317ad000 + 335666
3 Foundation 0x317ae09a 0x317ad000 + 4250
4 libSystem.B.dylib 0x329c892a 0x329a4000 + 149802
我怀疑调试构建处理内存的方式与特别构建处理内存的方式有所不同。在我看来,这段代码试图写入它无法访问的内存块,当它写入时,临时iPhone操作系统会关闭进程
是什么导致这种行为出现在即席发行版中,而不是调试版本中?即使在手机断开连接且调试器关闭的情况下,调试构建也可以正常工作
非常感谢
守则:
实现库的代码(第935行是该块的第一行,alloc语句)
:
EXFJpeg*jpegScanner=[[EXFJpeg alloc]init];
[JPEG扫描仪扫描图像数据:imgData];
CLLocation*location=self.gps.lastReading?self.gps.lastdreading:[self.gps.locationManager location];
[地点保留];
NSMutableArray*locArray=[self-createLocArray:location.coordinate.latitude];
EXFGPSLoc*gpsLoc=[[EXFGPSLoc alloc]init];
[self-populateGPS:gpsLoc:locArray];
[jpegScanner.exifMetaData addTagValue:gpsLoc-forKey:[NSNumber-numberwhithint:exifu GPSLatitude];
[gpsLoc发布];
locArray=[self-createLocArray:location.coordinate.longitude];
gpsLoc=[[EXFGPSLoc alloc]init];
[self-populateGPS:gpsLoc:locArray];
[locArray release];
[jpegScanner.exifMetaData addTagValue:gpsLoc-forKey:[NSNumber-numberwhithint:exifu GPSLongitude];
[gpsLoc发布];
NSString*ref=(location.coordinate.latitude我不久前遇到了同样的问题,并找到了两种解决方案(或变通方法):
使用中的预编译库,而不是从源代码编译
将EXFMetaData.m的第1270行更改为:
CFDataGetBytes(*exifData,CFRangeMake(6,2),顺序)
正如这里所建议的:修补它:
在第330行的te文件EXFJpeg.m中写入此代码
如果(!imageBytePtr)
返回
就在之前
UInt8 val=[self readNextbyte]
仅此而已!!您尝试过发布版本吗?这样您仍然可以调试,但如果这是一个奇怪的优化问题,您可能会捕获它…基于异常的0x00000地址,它看起来确实像是通过空指针读取的。很好。我还没有尝试过使用预编译库,但#2对我有效。谢谢!
EXFJpeg* jpegScanner = [[EXFJpeg alloc] init];
[jpegScanner scanImageData:imgData];
CLLocation *location = self.gps.lastReading ? self.gps.lastReading : [self.gps.locationManager location];
[location retain];
NSMutableArray* locArray = [self createLocArray:location.coordinate.latitude];
EXFGPSLoc* gpsLoc = [[EXFGPSLoc alloc] init];
[self populateGPS: gpsLoc :locArray];
[jpegScanner.exifMetaData addTagValue:gpsLoc forKey:[NSNumber numberWithInt:EXIF_GPSLatitude];
[gpsLoc release];
locArray = [self createLocArray:location.coordinate.longitude];
gpsLoc = [[EXFGPSLoc alloc] init];
[self populateGPS: gpsLoc :locArray];
[locArray release];
[jpegScanner.exifMetaData addTagValue:gpsLoc forKey:[NSNumber numberWithInt:EXIF_GPSLongitude];
[gpsLoc release];
NSString *ref = (location.coordinate.latitude <0.0)?ref = @"S": @"N";
[jpegScanner.exifMetaData addTagValue: ref forKey:[NSNumber numberWithInt:EXIF_GPSLatitudeRef] ];
ref = (location.coordinate.longitude <0.0)? @"W": @"E";
[jpegScanner.exifMetaData addTagValue: ref forKey:[NSNumber numberWithInt:EXIF_GPSLongitudeRef]];
[jpegScanner.exifMetaData addTagValue: @"Apple" forKey:[NSNumber numberWithInt:EXIF_Make];
[jpegScanner.exifMetaData addTagValue: @"iPhone" forKey:NSNumber numberWithInt:EXIF_Model];
[jpegScanner.exifMetaData addTagValue:[NSNumber numberWithInt:0] forKey:[NSNumber numberWithInt:EXIF_GPSAltitudeRef] ];
NSArray *arr = [[NSArray alloc] initWithObjects:[NSNumber numberWithInt:0], NSNumber numberWithInt:0], [NSNumber numberWithInt:2], [NSNumber numberWithInt:2], nil];
[jpegScanner.exifMetaData addTagValue: arr forKey:[NSNumber numberWithInt:EXIF_GPSVersion] ];
[arr release];
long numDenumArray[2];
long* arrPtr = numDenumArray;
[EXFUtils convertRationalToFraction:&arrPtr: [NSNumber numberWithDouble:location.altitude]];
EXFraction *fract = [[EXFraction alloc] initWith:numDenumArray[0] :numDenumArray[1]];
[jpegScanner.exifMetaData addTagValue:fract forKey:[NSNumber
numberWithInt:EXIF_GPSAltitude] ];
NSMutableData *newData = [[NSMutableData alloc] init];
[jpegScanner populateImageData:newData];
[jpegScanner release];
-(void) scanImageData: (NSData*) jpegData {
Debug(@"Starting scan headers");
// pointer to the end of the EXIF Data and the start of the rest of the image
ByteArray* endOfEXFPtr;
imageLength = CFDataGetLength((CFDataRef)jpegData);
// CFRetain(&imageLength);
Debug(@"Length of image %i", imageLength);
imageBytePtr = (UInt8 *) CFDataGetBytePtr((CFDataRef)jpegData);
imageStartPtr = imageBytePtr;
// check if a valid jpeg file
UInt8 val = [self readNextbyte];
if (val != M_BEG){
Debug(@"Not a valid JPEG File");
return;
}
val = [self readNextbyte];
if (val != M_SOI){
Debug(@"Not a valid start of image JPEG File");
return;
}
// increment this to position after second byte
BOOL finished =FALSE;
while(!finished){
// increment the marker
val = [self nextMarker];
Debug(@"Got next marker %x at byte count %i", val, (imageBytePtr - imageStartPtr));
switch(val){
case M_SOF0: /* Baseline */
case M_SOF1: /* Extended sequential, Huffman */
case M_SOF2: /* Progressive, Huffman */
case M_SOF3: /* Lossless, Huffman */
case M_SOF5: /* Differential sequential, Huffman */
case M_SOF6: /* Differential progressive, Huffman */
case M_SOF7: /* Differential lossless, Huffman */
case M_SOF9: /* Extended sequential, arithmetic */
case M_SOF10: /* Progressive, arithmetic */
case M_SOF11: /* Lossless, arithmetic */
case M_SOF13: /* Differential sequential, arithmetic */
case M_SOF14: /* Differential progressive, arithmetic */
case M_SOF15: /* Differential lossless, arithmetic */
// Remember the kind of compression we saw
{
int compression = *imageBytePtr; // <-----------LINE 372
self.exifMetaData.compression = compression;
// Get the intrinsic properties fo the image
[self readImageInfo];
}
break;
case M_SOS: /* stop before hitting compressed data */
Debug(@"Found SOS at %i", imageBytePtr - imageStartPtr);
// [self skipVariable];
// Update the EXIF
// updateExif();
finished = TRUE;
break;
case M_EOI: /* in case it's a tables-only JPEG stream */
Debug(@"End of Image reached at %i ", imageBytePtr - imageStartPtr);
finished =TRUE;
break;
case M_COM:
Debug(@"Got com at %i",imageBytePtr - imageStartPtr);
break;
case M_APP0:
case M_APP1:
case M_APP2:
case M_APP3:
case M_APP4:
case M_APP5:
case M_APP6:
case M_APP7:
case M_APP8:
case M_APP9:
case M_APP10:
case M_APP11:
case M_APP12:
case M_APP13:
case M_APP14:
case M_APP15:
// Some digital camera makers put useful textual
// information into APP1 and APP12 markers, so we print
// those out too when in -verbose mode.
{
Debug(@"Found app %x at %i", val, imageBytePtr - imageStartPtr);
NSData* commentData = [self processComment];
NSNumber* key = [[NSNumber alloc]initWithInt:val];
// add comments to dictionary
[self.keyedHeaders setObject:commentData forKey:key];
[key release];
// will always mark the end of the app_x block
endOfEXFPtr = imageBytePtr;
// we pass a pointer to the NSData pointer here
if (val == M_APP0){
Debug(@"Parsing JFIF APP_0 at %i", imageBytePtr - imageStartPtr);
[self parseJfif:(CFDataRef*)&commentData];
} else if (val == M_APP1){
[self parseExif:(CFDataRef*)&commentData];
Debug(@"Finished App1 at %i", endOfEXFPtr - imageStartPtr);
} else if (val == M_APP2){
Debug(@"Finished APP2 at %i", imageBytePtr - imageStartPtr);
}else{
Debug(@"Finished App &x at %i", val, imageBytePtr - imageStartPtr);
}
}
break;
case M_SOI:
Debug(@"SOI encountered at %i",imageBytePtr - imageStartPtr);
break;
default: // Anything else just gets skipped
Debug(@"NOt handled %x skipping at %i",val, imageBytePtr - imageStartPtr);
[self skipVariable]; // we assume it has a parameter count...
break;
}
}
// add in the bytes after the exf block
NSData* theRemainingdata = [[NSData alloc] initWithBytes:endOfEXFPtr length:imageLength - (endOfEXFPtr - imageStartPtr)];
self.remainingData = theRemainingdata;
[theRemainingdata release];
endOfEXFPtr = NULL;
imageStartPtr = NULL;
imageBytePtr = NULL;
}