Question

以下是我正在使用的代码，

- (void) readDataFromDatabase{

    sqlite3 *database;
    persons = [[NSMutableArray alloc]init];

    if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK){

        const char *sqlStatement = "select * from sdata";
        sqlite3_stmt *compiledStatement;
        if (sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK){

            while (sqlite3_step(compiledStatement) == SQLITE_ROW) {

                pID = sqlite3_column_int(compiledStatement, 0);
                pName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
                pAdd = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
                pPh = sqlite3_column_int(compiledStatement, 3);
                pCp = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 4)];
                pLat = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 5)];
                pLong = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 6)];

                Person *temp = [[Person alloc]initWithID:pID name:pName address:pAdd phone:pPh contactperson:pCp fLat:pLat fLong:pLong];


                [persons addObject:temp];
                NSLog(@"Inside Persons : %@",persons);
                [temp release];

            }

        }
        sqlite3_finalize(compiledStatement);
    }
    sqlite3_close(database);
}
For the NSLog in  NSLog(@"Inside Persons : %@",persons);i get the output as Inside Persons : ("<Person: 0x4c26ae0>"

- (void)startTest
{

    for(int j=0;j<[persons count];j++){

        Person *arr = [persons objectAtIndex:j];


        NSString *s = [[NSString alloc]initWithFormat:@"%f",arr.fLat] ;
        NSLog(@" data in array : %@", s);
    }


#define COORDS_COUNT 1
#define RADIUS       100.0f

    CLLocationCoordinate2D coords[COORDS_COUNT] = {
        CLLocationCoordinate2DMake([arr.fLat floatValue], [arr.fLong floatValue ]),


    };

    CLLocationCoordinate2D center = CLLocationCoordinate2DMake([lat floatValue], [longt floatValue]); 
    CLRegion *region = [[CLRegion alloc] initCircularRegionWithCenter:center radius:RADIUS identifier:@"Banashankari"];



    for (int i = 0; i < COORDS_COUNT; i++)
    {
        CLLocationCoordinate2D coord = coords[i];

        NSString *coordString = [NSString stringWithFormat:@"%f,%f",coord.latitude, coord.longitude];
        [dataArray addObject:coordString];

        if ([region containsCoordinate:coord])
        {
            NSLog(@"location %f, %f is within %.0f meters of coord %f, %f", coord.latitude, coord.longitude, RADIUS, center.latitude, center.longitude);
            [resultArray addObject:coordString];
            NSLog(@"data in resultArray %@",resultArray);
        }
        else 
        {
            NSLog(@"location %f, %f is not within %.0f meters of coord %f, %f", coord.latitude, coord.longitude, RADIUS, center.latitude, center.longitude);    

        }
    }
}

对于NSLog（@“数组中的数据：％@”，s）;我将输出作为数组中的数据：0.000000，但预期值是12.920684,77.560033。如何在startTest方法中获取预期值，我在做错误。在此先感谢。

Answer 1

对nsmutablearray人使用@property（非原子，保留）？还要尝试检查是否在数组中获取值。在数组填充值后使用retain。

如何从另一种方法中的一个方法读取值

1 个答案: