NSArray与NSDictionary的writeToFile分析

测试代码如下：

int main(int argc, char *argv[]) {      NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];NSArray* animals = [NSArray arrayWithObjects:@"dog",@"cat",nil];NSArray* operations = [NSArray arrayWithObjects:@"windows",@"Mac OS X",nil];NSArray* books = [NSArray arrayWithObjects:@"C++",@"C",nil];NSString * arraypath = @"/Volumes/VMware Shared Folders/VMShare/array.txt";[animals writeToFile:arraypath atomically:YES];  NSDictionary* Dict = [NSDictionary dictionaryWithObjectsAndKeys:animals,@"animal",operations,@"operation system",books,@"programming",nil];NSString * dictpath = @"/Volumes/VMware Shared Folders/VMShare/dict.txt";[Dict writeToFile:dictpath atomically:YES]; [pool release];    return 0;}

array.txt文件的内容

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <string>dog</string>
    <string>cat</string>
</array>
</plist>

dict.txt文件的内容

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>animal</key>
    <array>
        <string>dog</string>
        <string>cat</string>
    </array>
    <key>operation system</key>
    <array>
        <string>windows</string>
        <string>Mac OS X</string>
    </array>
    <key>programming</key>
    <array>
        <string>C++</string>
        <string>C</string>
    </array>
</dict>
</plist>

可见生成的是plist文件，<plist></plist>的第一个标志指定了类型。