我是编程和stackoverflow的新手，并决定从学习目标c开始。
在深处，我知道。
我很难找到解析edl文件的最佳方法。 它基本上是一个不超过100KB的ASCII文本文件。 以下是典型cmx3600 edl的结构：
TITLE: EP1 FINAL.EDL SECTION2
FCM: NON-DROP FRAME
001 A199_C00 V C 20:38:24:15 20:38:26:04 10:30:00:02 10:30:01:16
* SOURCE FILE: A199_C008_0915AH_001
002 A199_C00 V C 20:34:48:17 20:34:51:23 10:30:01:16 10:30:04:22
* SOURCE FILE: A199_C007_0915VE_001
我正在尝试找出解析或扫描每个元素到字段/数组的最佳方法，即
editNum = 001
tapeName = A199_C00
channel = V
Operation = C
sourceIn = 20:38:24:15
sourceOut = 20:38:26:04
recIn = 10:30:00:02
recOut = 10:30:01:16
sourceFile = A199_C008_0915AH_001
到目前为止，这是我的代码：
-(IBAction)importEdl:(id)sender {
//defines an Array of allowed file types with file extension ".EDL and .edl"
NSOpenPanel *myPanel = [NSOpenPanel openPanel];
NSArray *fileTypes = [NSArray arrayWithObjects:@"EDL", @"edl", nil];
myPanel.allowedFileTypes = fileTypes;
myPanel.allowsMultipleSelection = NO;
if ([myPanel runModal] == NSOKButton)
{
NSString *theFilePath = [myPanel filename];
NSString *psEdlFile = [NSString stringWithContentsOfFile:theFilePath encoding:NSASCIIStringEncoding error:NULL];
// Reads the file as one string. EDL's are simple ASCII text files of roughly 50KB.
NSArray *psEdlLines = [psEdlFile componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
// Separates the data into lines.
if([psEdlLines count] == 0)
{
NSLog(@"Error!");
} //prints error if EDL file has no events.
NSUInteger count;
int i;
for (i = 0, count = [psEdlLines count]; i < count; i = i + 1)
{
NSString *lineStrings = [psEdlLines objectAtIndex:i];
NSLog(@"Line %d is %@",i+1,lineStrings);
//NSArray *linesEnum = [psEdlLines objectAtIndex:i];
//this creates an array of lines
//NSLog(@"index is: %d %@",i, linesEnum);
}
}
}
@end
输出结果为：
2012-03-20 15:22:08.956 TestProgram[412:903] Line 1 is TITLE: EP1 FINAL.EDL SECTION2
2012-03-20 15:22:08.957 TestProgram[412:903] Line 2 is FCM: NON-DROP FRAME
2012-03-20 15:22:08.957 TestProgram[412:903] Line 3 is 001 A199_C00 V C 20:38:24:15 20:38:26:04 10:30:00:02 10:30:01:16
2012-03-20 15:22:08.957 TestProgram[412:903] Line 4 is * SOURCE FILE: A199_C008_0915AH_001
2012-03-20 15:22:08.957 TestProgram[412:903] Line 5 is 002 A199_C00 V C 20:34:48:17 20:34:51:23 10:30:01:16 10:30:04:22
2012-03-20 15:22:08.957 TestProgram[412:903] Line 6 is * SOURCE FILE: A199_C007_0915VE_001
2012-03-20 15:22:08.957 TestProgram[412:903] Line 7 is 003 A199_C00 V C 20:42:32:01 20:42:35:19 10:30:04:22 10:30:08:15
2012-03-20 15:22:08.957 TestProgram[412:903] Line 8 is * SOURCE FILE: A199_C009_0915RX_001
2012-03-20 15:22:08.957 TestProgram[412:903] Line 9 is
2012-03-20 15:22:08.958 TestProgram[412:903] Line 10 is
我没有走得太远，你可以看到。 任何想法将不胜感激。 提前致谢， 皮特。
答案 0 :(得分：0)
好，
我一直试图通过使用NSScanner和行前缀来解决这个问题。 我可以扫描以数字开头的行（事件），并隔离与每个相应事件相关的注释和效果。
这是代码：
for (NSString *line in psEdlLines)// just an NSLog test before scanning process
{
NSLog(@"Before scanner: %@",line);//All lines.
}
for (NSString *line in psEdlLines)// Scanner process.
{
int eventNum;
NSString *comment;
NSString *effect;
NSScanner *lineScanner = [NSScanner scannerWithString:line];
while ([lineScanner scanInt:&eventNum])
{
NSLog(@"Scanner: Event only: %@:", line);
}
if ([line hasPrefix:@"*"])
{
comment = [line substringFromIndex:0];
NSLog(@"Comment for event %03i: %@",eventNum, comment);
}
if ([line hasPrefix:@"M2"])
{
effect = [line substringFromIndex:0];
NSLog(@"Effect for event %03i: %@",eventNum, effect);
}
}
@end
这是3事件edl文件的输出：
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: TITLE: EP1 FINAL.EDL SECTION2
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: FCM: NON-DROP FRAME
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: 001 A180_C00 V C 20:29:12:18 20:29:13:21 10:46:39:20 10:46:40:23
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: * SOURCE FILE: A180_C001_09138L_001
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: 002 A181_C01 V C 22:10:03:03 22:10:05:09 10:46:40:23 10:46:43:04
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: * SOURCE FILE: A181_C010_0913EA_001
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: 003 A181_C01 V C 22:10:05:09 22:10:05:10 10:46:43:04 10:46:43:09
2012-03-23 14:23:48.040 TestProgram[1621:903] Before scanner: M2 A181_C01 000.0 22:10:05:09
2012-03-23 14:23:48.041 TestProgram[1621:903] Before scanner: * * FREEZE FRAME
2012-03-23 14:23:48.041 TestProgram[1621:903] Before scanner: * SOURCE FILE: A181_C010_0913EA_001
2012-03-23 14:23:48.041 TestProgram[1621:903] Before scanner:
2012-03-23 14:23:48.041 TestProgram[1621:903] Scanner: Event only: 001 A180_C00 V C 20:29:12:18 20:29:13:21 10:46:39:20 10:46:40:23:
2012-03-23 14:23:48.041 TestProgram[1621:903] Comment for event 001 * SOURCE FILE: A180_C001_09138L_001
2012-03-23 14:23:48.041 TestProgram[1621:903] Scanner: Event only: 002 A181_C01 V C 22:10:03:03 22:10:05:09 10:46:40:23 10:46:43:04:
2012-03-23 14:23:48.041 TestProgram[1621:903] Comment for event 002 * SOURCE FILE: A181_C010_0913EA_001
2012-03-23 14:23:48.042 TestProgram[1621:903] Scanner: Event only: 003 A181_C01 V C 22:10:05:09 22:10:05:10 10:46:43:04 10:46:43:09:
2012-03-23 14:23:48.042 TestProgram[1621:903] Effect for event 003 M2 A181_C01 000.0 22:10:05:09
2012-03-23 14:23:48.042 TestProgram[1621:903] Comment for event 003 * * FREEZE FRAME
2012-03-23 14:23:48.042 TestProgram[1621:903] Comment for event 003 * SOURCE FILE: A181_C010_0913EA_001
我可以为edl文件的注释行中可能出现的所有可能性添加if语句。 这应该允许我在循环中根据需要处理每个行元素。
这看起来不错吗？
谢谢， 皮特。
答案 1 :(得分：0)
更多进展。
if ([lineScanner scanInt:&eventNum])
{
// parse the event into fields
// does not work if edl contains dissolve or wipe
// need to automatically convert dissolves into cuts
NSString *editNum;
NSString *reelName;
NSString *channels;
NSString *operation;
//NSString *opDuration;
NSString *sourceInTime;
NSString *sourceOutTime;
NSString *destInTime;
NSString *destOutTime;
NSScanner *elementScanner = [NSScanner scannerWithString:line];
//NSString *token = [NSString string];
NSCharacterSet *divider = [NSCharacterSet whitespaceCharacterSet];
[elementScanner scanUpToCharactersFromSet:divider intoString:&editNum];
[elementScanner scanUpToCharactersFromSet:divider intoString:&reelName];
[elementScanner scanUpToCharactersFromSet:divider intoString:&channels];
[elementScanner scanUpToCharactersFromSet:divider intoString:&operation];
//[elementScanner scanUpToCharactersFromSet:divider intoString:&opDuration];
[elementScanner scanUpToCharactersFromSet:divider intoString:&sourceInTime];
[elementScanner scanUpToCharactersFromSet:divider intoString:&sourceOutTime];
[elementScanner scanUpToCharactersFromSet:divider intoString:&destInTime];
[elementScanner scanUpToCharactersFromSet:divider intoString:&destOutTime];
NSLog(@"Event\tReelName\tChannels\tOperation\tSource In\tSource Out\tDest In\t\tDest Out");
NSLog(@"%@\t%@\t%@\t\t\t%@\t\t\t%@\t%@\t%@\t%@",
editNum, reelName, channels, operation, /*opDuration,*/ sourceInTime, sourceOutTime, destInTime,destOutTime);
}
输出以下内容。
2012-03-29 15:54:15.489 TestProgram[2414:903] Scanner:Title = EP1 FINAL.EDL SECTION2
2012-03-29 15:54:15.489 TestProgram[2414:903] Event ReelName Channels Operation Source In Source Out Dest In Dest Out
2012-03-29 15:54:15.489 TestProgram[2414:903] 001 A180_C00 V C 20:29:12:18 20:29:13:21 10:46:39:20 10:46:40:23
2012-03-29 15:54:15.489 TestProgram[2414:903] Comment for event 001 * SOURCE FILE: A180_C001_09138L_001
2012-03-29 15:54:15.489 TestProgram[2414:903] Event ReelName Channels Operation Source In Source Out Dest In Dest Out
2012-03-29 15:54:15.490 TestProgram[2414:903] 002 A181_C01 V C 22:10:03:03 22:10:05:09 10:46:40:23 10:46:43:04
2012-03-29 15:54:15.490 TestProgram[2414:903] Comment for event 002 * SOURCE FILE: A181_C010_0913EA_001
2012-03-29 15:54:15.490 TestProgram[2414:903] Event ReelName Channels Operation Source In Source Out Dest In Dest Out
2012-03-29 15:54:15.490 TestProgram[2414:903] 003 A181_C01 V C 22:10:05:09 22:10:05:10 10:46:43:04 10:46:43:09
2012-03-29 15:54:15.490 TestProgram[2414:903] Effect for event 003 M2 A181_C01 000.0 22:10:05:09
2012-03-29 15:54:15.491 TestProgram[2414:903] Comment for event 003 * * FREEZE FRAME
2012-03-29 15:54:15.491 TestProgram[2414:903] Comment for event 003 * SOURCE FILE: A181_C010_0913EA_001