我在我的服务器中存储了一些图像。我使用 JSON 从服务器获取远程数据。当我将图像存储在本地数据库中时，它正在工作。当我使用 json url 时它不起作用。我收到 EXC_BAD_ACCESS 错误。
代码：
Mysof.h 文件：
@interface Mysof : NSObject{
NSInteger sofaId;
NSString *sofa;
NSString *rating;
UIImage *photo;
}
@property (nonatomic,retain)NSString *sofa;
@property (nonatomic, assign) NSInteger sofaId;
@property (nonatomic, retain)NSString *rating;
@property (nonatomic, retain) UIImage *photo;
@end
Mysof.m 文件：
@implementation Mysof
@synthesize sofId;
@synthesize sofa;
@synthesize rating;
@synthesize photo;
@end
Sofalistsql.h 文件：
@interface Sofalistsql : NSObject
{
sqlite3 *db;
}
- (NSMutableArray *) getMysofas;
@end
.m 文件：
@implementation Sofalistsql
- (NSMutableArray *) getMysofas{
NSMutableArray *sofArray = [[NSMutableArray alloc] init];
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSError *err;
NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"Empty" ofType:@"sqlite"];
//NSLog(@"bundlePath %@", bundlePath);
//call update function to check any data updated,
//if there is a version difference
//update the data base with all the required fileds.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//NSLog(@"docs dir is %@", documentsDirectory);
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"App6.sqlite"];
[fileMgr copyItemAtPath:bundlePath toPath:appFile error:&err];
NSURL *URL = [NSURL URLWithString:@"http://server.net/projects/mobile/jsonstring.php"];
NSLog(@"URL is %@", URL);
NSError *error;
NSString *stringFromFileAtURL = [[NSString alloc]
initWithContentsOfURL:URL
encoding:NSUTF8StringEncoding
error:&error];
//NSLog(@"response is %@", stringFromFileAtURL);
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"App6.sqlite"];
NSArray *userData = [stringFromFileAtURL JSONValue];
// NSArray *skarray = [[NSArray alloc]init];
NSLog(@"userdata is %@", userData);
// int i = 0;
BOOL notExist = TRUE;
for (NSArray *skarray in userData) {
for (NSDictionary *tuser in skarray) {
//if already exists in data base id then overwrite the name
if (sqlite3_open([path UTF8String], &db) == SQLITE_OK) {
const char *sql = [[NSString stringWithFormat:@"SELECT id FROM categories where id = '%@'",[tuser objectForKey:@"id"]] cStringUsingEncoding:NSUTF8StringEncoding];
//NSLog(@"check stmt is %s", sql);
sqlite3_stmt *sqlStatement,*addStmt;
if (sqlite3_prepare_v2(db, sql, -1, &sqlStatement, NULL) == SQLITE_OK) {
notExist = TRUE;
while (sqlite3_step(sqlStatement) == SQLITE_ROW) {
notExist = FALSE;
Mysof *Mylist = [[Mysof alloc]init];
Mylist.sofaId = sqlite3_column_int(sqlStatement, 0);
Mylist.sofa = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,1)];
Mylist.rating = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 2)];
const char *raw = sqlite3_column_blob(sqlStatement, 3);
int rawLen = sqlite3_column_bytes(sqlStatement, 3);
NSData *data = [NSData dataWithBytes:raw length:rawLen];
Mylist.photo = [[UIImage alloc] initWithData:data];
[sofArray addObject:Mylist];
}
if(notExist){
//NSLog(@"cat id does not exist");
const char *sqlInsert = [[NSString stringWithFormat:@"insert into categories (id, cat_name,order_by) values ('%@', '%@', '%@')", [tuser objectForKey:@"id"], [tuser objectForKey:@"cat_name"],[tuser objectForKey:@"order_by"]] cStringUsingEncoding:NSUTF8StringEncoding];
//NSLog(@"stmt is %s", sqlInsert);
if(sqlite3_prepare_v2(db, sqlInsert, -1, &addStmt, NULL) != SQLITE_OK)
NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(db));
if(SQLITE_DONE != sqlite3_step(addStmt))
NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(db));
}
}
}
}
}
return sofArray;
}
@end
在 viewController.m 文件中：
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
Sofalistsql * mysofs =[[Sofalistsql alloc] init];
self.sofas = [mysofs getMysofas];
}
按钮单击以显示来自服务器的图像：
-(void)click:(id)sender{
scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0,500,320,200)];
scrollview.showsVerticalScrollIndicator=NO;
scrollview.showsHorizontalScrollIndicator=NO;
scrollview.scrollEnabled=YES;
int Width = 0;
// Width = Width + 20+(i*74);
for (int i = 0; i<[self.sofas count]; i++ ) {
NSLog(@"index %d",i);
// imgView1=[[UIButton alloc]initWithFrame:CGRectMake(20+(i*74), 500, 72, 72)];
imgView1=[[UIButton alloc]initWithFrame:CGRectMake(20+(i*74), 0, 72, 72)];
Width = Width + 20+(i*74);
[imgView1 setTag:i+1];
[imgView1 addTarget:self action:@selector(dbsofaClicked:) forControlEvents:UIControlEventTouchUpInside];
[imgView1 setImage:((Mysof *)[self.sofas objectAtIndex:i]).photo forState:UIControlStateNormal];
[scrollview addSubview:imgView1];
// [myScroll addSubview:imgView1];
}
[scrollview setContentSize:CGSizeMake(Width,imgView1.frame.size.height+20)];
[self.view addSubview:scrollview];
}
jsonstring.php 文件：
<?php
require_once('database_connection.php');
$i = 0;
$j = 0;
$k = 0;
$l = 0;
mysql_query('SET CHARACTER SET utf8') or die("MYSQL character set error: ".mysql_error());
$result = array();
$sql=mysql_query("SELECT * FROM categories ORDER BY id ASC") or die(mysql_error());
if(mysql_num_rows($sql) > 0) {
while($res=mysql_fetch_array($sql, MYSQL_ASSOC)){
$result[0][$i] = $res;
$art_sql=mysql_query("SELECT * FROM product WHERE cat_id=" .$res['id']. " ORDER BY id ASC") or die(mysql_error());
if (mysql_num_rows($art_sql) > 0){
while($art_res=mysql_fetch_array($art_sql, MYSQL_ASSOC)){
//$art_res['art_details'] = (utf8_encode(htmlentities($art_res['art_details'])));
//$art_res['art_details'] = htmlentities($art_res['art_details']);
//echo $art_res['art_details'];
$result[1][$k] = $art_res;
//print_r($art_res);
$k = $k+1;
}
}
$i= $i+1;
}
$version_sql = mysql_query("SELECT * FROM version_app order by product_id desc limit 1") or die(mysql_error());
$row = mysql_fetch_array($version_sql);
$last_version = $row['product_id'];
$result['2'][$l] = array('product_id' => $last_version);
$l = $l+1;
}
/*echo "<pre>";
print_r($result);
echo "</pre>";exit;*/
$str_enc = json_encode($result);
//print_r($str_enc); exit;
$str=str_replace('\r','',$str_enc);
$str=str_replace('\t','',$str);
$str=str_replace('\n','',$str);
$str = stripslashes($str);
//$str_renc = json_encode(json_decode($str));
echo $str;
mysql_close();
?>
NS日志：
userdata is (
(
{
"cat_name" = Table1;
id = 1;
"order_by" = 1;
},
{
"cat_name" = Table2;
id = 2;
"order_by" = 2;
},
{
"cat_name" = test;
id = 3;
"order_by" = 3;
}
),
(
{
"cat_id" = 1;
id = 2;
"order_by" = 1;
"product_image" = "img.png";
},
{
"cat_id" = 1;
id = 3;
"order_by" = 2;
"product_image" = "img1.png";
},
{
"cat_id" = 1;
id = 4;
"order_by" = 3;
"product_image" = "img2.png";
},
{
"cat_id" = 1;
id = 5;
"order_by" = 4;
"product_image" = "img3.png";
},
{
"cat_id" = 1;
id = 6;
"order_by" = 5;
"product_image" = "img4.png";
},
{
"cat_id" = 1;
id = 7;
"order_by" = 6;
"product_image" = "img5.png";
},
)
)
array (
)
2013-08-16 13:19:53.044 App[3395:c07] scroll is <UIScrollView: 0x9de7cb0; frame = (0 300; 320 200); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x9de60e0>; layer = <CALayer: 0x9de4bc0>; contentOffset: {0, 0}>
我在本地数据库中存储了相同的表名。并使用覆盖数据库。在本地数据库中，我以BLOB类型存储图像。但是在我的数组中，我什么也没显示。应用程序正在运行。但是图像没有从数据库中显示。