從應用程序目錄中檢索文檔

Question

NSURL* suppurl = [manager URLForDirectory:NSApplicationSupportDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil]; 


NSString *path = [suppurl path]; 
NSLog(@" Path %@",path); 


NSString* myfolder = [path stringByAppendingPathComponent:@"MyFolder"]; 

NSDirectoryEnumerator* myFolderDir = [manager enumeratorAtPath:myfolder]; 
for (NSString* file in myFolderDir) 
{ 

    NSLog(@" file %@",file); 

    NSString *getImagePath = [path stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",file]]; 

    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:getImagePath]; 
    NSLog(@" image path %@",getImagePath); 

    if (exists) 
    { 
     NSLog(@" exists"); 
    } 

第一個NSLog(@" file %@",file);成功記錄文件名...但BOOL存在不。

可能是什麼問題？

Answer 1

您正在枚舉myFolderDir中的文件，但是您試圖驗證path中是否存在同名文件。替換爲：

NSString *getImagePath = [myFolderDir stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",file]]; 

另外請注意，您不必這樣做：

[NSString stringWithFormat:@"%@",file] 

... file已經是一個NSString。

如果你想該文件夾中列舉的圖像，考慮測試文件擴展名：

if ([[file pathExtension] isEqualToString: @"jpg"]) { 
    // load the image 
    [self loadImage: [myFolderDir stringByAppendingPathComponent:file]]; 
}