[Object C]_[初级]_[创建文件路径时，已存在同名目录和文件名的问题的解决方案]

场景：导出数据到本地，以文件夹格式和文件名格式导出，数据中存在同名问题，为了防止不覆盖，要创建一个新的文件夹或者文件名用以区分同名的不同数据。

下面编写一个小例子进行说明：

DirAndFile.h

#import <Foundation/Foundation.h>

@interface DirAndFile : NSObject

+(NSString*) getDirPathNewName:(NSString*)path;
+(NSString*) getFilePathNewName:(NSString*)path withPosfix:(NSString*)posfix;

@end
DirAndFile.m

#import "DirAndFile.h"

@implementation DirAndFile

//路径中存在同名目录，创建一个新的目录名
+(NSString*) getDirPathNewName:(NSString*)path
{

NSFileManager* manager = [NSFileManager defaultManager];

NSString* tempPath =path;
NSString* tempDirPath =@"";
NSRange range = [path rangeOfString:@"/" options:NSBackwardsSearch];
range.length = range.location;
range.location = 0;
tempDirPath = [path substringWithRange:range];

//获取目录最后一个目录名称
NSString* name=[path lastPathComponent];

int count = 1;
BOOL isDir =NO;

while (true)
{
// 判断目录是否存在
BOOL isExistDir =[manager fileExistsAtPath:tempPath isDirectory:&isDir];
if (isDir && isExistDir)
{
if ([name rangeOfString:@"(" options:NSCaseInsensitiveSearch].location != NSNotFound)
{
NSRange range = [name rangeOfString:@"(" options:NSBackwardsSearch];
range.length = range.location;
range.location = 0;
name = [name substringWithRange:range];
}
name =[name stringByAppendingFormat:@"(%d)",count];
tempPath =[tempDirPath stringByAppendingPathComponent:name];
isDir =NO;
++count;

}
else
{
break;
}

}
return tempPath;
}
//路径中存在同名文件名，创建一个新的文件名
+(NSString*) getFilePathNewName:(NSString*)path withPosfix:(NSString*)posfix
{
NSAutoreleasePool *pool = [NSAutoreleasePool new];
NSFileManager* manager = [NSFileManager defaultManager];
int count = 1;

NSRange range = [path rangeOfString:@"." options:NSBackwardsSearch];
range.length = range.location;
range.location = 0;
NSString* namePart = [path substringWithRange:range];
NSString* temp = namePart;
while (YES)
{
temp = [temp stringByAppendingString:posfix];
if (![manager fileExistsAtPath:temp])
{
[temp retain];
break;
}
temp = [namePart stringByAppendingFormat:@"(%d)",count++];
}
[pool drain];
return temp;
}

@end

main.m

#import <Foundation/Foundation.h>
#import "DirAndFile.h"

int main(int argc, const char * argv[]) {
@autoreleasepool {
//存在同名目录名称时，在目录后添加一个数字标记区分同名目录。
NSString *dirPath =@"/Users/mac/work/test-dir(2)";
NSFileManager *fm =[NSFileManager defaultManager];

for (int i =0; i<5; ++i)
{
NSString *tempDir =[dirPath stringByAppendingPathComponent:@"aa"];
tempDir= [DirAndFile getDirPathNewName:tempDir];
[fm createDirectoryAtPath:tempDir withIntermediateDirectories:NO attributes:nil error:nil];
NSLog(@"dir%d:%@",i+1,tempDir);

}

//存在同名文件名称，文件名后添加数字标识
FILE *file =NULL;
for (int i =0; i<5; ++i)
{
NSString* filePath =[dirPath stringByAppendingPathComponent:@"content.txt"];
filePath =[DirAndFile getFilePathNewName:filePath withPosfix:@".txt"];
file =fopen([filePath UTF8String], "w");
if (file == NULL)
{
break;
}
NSString *content=@"hello world";
fwrite([content UTF8String], strlen([content UTF8String]), 1, file);
fclose(file);

}

}
return 0;
}


运行结果：