前言
- NSFileManager 类主要对文件的操作（删除、修改、移动、复制等等）
- NSFileHandle 类主要对文件内容进行读取和写入操作
NSString stringWithContentsOfFile
- 从txt 读取数据的例子
NSString *sandboxPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) firstObject];
NSString *realFile = [sandboxPath stringByAppendingPathComponent:@"keyword.txt"];
NSLog(@"realFile %@",realFile);// realFile /var/mobile/Containers/Data/Application/4D54232E-8358-4E1C-9DDC-C00BC0CA3EC6/Documents/Keyword.txt
// NSString *realFile = [[contentUserIDURL stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"real.txt"];
// NSString *realFile = @"/var/mobile/Media/";
NSString *content = [NSString stringWithContentsOfFile:realFile encoding:NSUTF8StringEncoding error:nil];
NSString *contentUserID =content;
NSArray *lines; /*将文件转化为一行一行的*/
lines = [contentUserID componentsSeparatedByString:@"\n"];
if (contentUserID) {
NSLog(@"contentUserID is lines：%@",lines);
NSLog(@"contentUserID is lines.count：%ld",lines.count);
keylines = lines;
if (kni > keylines.count )
{
/* code */
return;
}
UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
[pasteboard setString:keylines[kni]];
kni++;
[self startNexTask];
// [self setuptxt];
}else{
NSLog(@"contentUserID is nil");
return;
}
NSFileHandle
- setupsavetxt,写数据的例子
// 写数据到
NSString *contentUserID = tmp;
// sandboxPath
NSString *sandboxPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) firstObject];
NSString *realFile = [sandboxPath stringByAppendingPathComponent:@"real.txt"];
NSLog(@"realFile");
if ([[NSFileManager defaultManager] fileExistsAtPath:realFile]) {
// NSString *deviceID = GetUniqueDeviceID();
NSLog(@"fileExistsAtPath fileExistsAtPath");
if (contentUserID) {
NSLog(@"contentUserID contentUserID:%@",contentUserID);
//将字符串转成NSData类型
NSData *data = [contentUserID dataUsingEncoding: NSUTF8StringEncoding];
// [contentUserID writeToFile:realFile atomically:YES encoding:NSUTF8StringEncoding error:nil];
// [data writeToFile:realFile atomically:YES];//覆盖
NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:realFile];///打开一个文件准备更新
[fileHandle seekToEndOfFile]; // 可以操作光标到文件内容的末尾。
[fileHandle writeData:data]; //追加写入数据////写入数据
[fileHandle closeFile];
}
}else{
// [[NSFileManager defaultManager] createFileAtPath:realFile contents:[contentUserID dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
[contentUserID writeToFile:realFile atomically:YES encoding:NSUTF8StringEncoding error:nil];
}
see also
- [快速定位闪退日志]
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