查看圖像我是新手與iPhone編程。我有一個上傳圖片從iPhone到服務器,它在MySQL數據庫存儲在服務器的任務。之後,我從數據庫中檢索圖像並將其顯示在iPhone上。iPhone:從MySQL數據庫服務器上
在上傳: 我用ASIFormDataRequest到的圖像數據發送到服務器和PHP腳本(uploadpicture.php)將圖像數據存儲到數據庫BLOB數據類型。
有關下載: 我用NSURLRequest與NSURLConnection和PHP腳本(downloadpicture.php)從數據庫中檢索圖像並將其發送回iphone。
這是一個PHP腳本:
$con = mysql_connect("localhost:8889", "root", "root");
if (!$con) {
echo "can not connect database";
die("Could not connect: " .mysql_error());
}
echo "Connect database succesfully";
mysql_select_db("myDatabase", $con);
$result = mysql_query("select * from pictures" ,$con);
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
echo "{$row['id']}";
echo "{$row['title']}";
echo "{$row['description']}";
echo "{$row['image']}";
echo "{$row['rate']}";
echo "{$row['numberofrate']}";
echo "{$row['numberofdownload']}";
echo "{$row['numberofcomment']}";
echo "<br/>";
}
mysql_close($con);
echo "completed";
這是與obj-C代碼:
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
self.connection = nil;
NSString * dataStr = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];
NSArray * lines = [dataStr componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
NSMutableArray * res = [NSMutableArray arrayWithCapacity:[lines count]];
NSString * line = nil;
Picture * pic = nil;
for (NSUInteger i = 0; i < [lines count]; i++) {
line = (NSString*) [lines objectAtIndex:i];
NSArray * arr = [line componentsSeparatedByString:@","];
pic = [[Picture alloc] init];
pic.pictureId = [[NSDecimalNumber decimalNumberWithString:(NSString *) [arr objectAtIndex:0]] intValue];
pic.title = (NSString*) [arr objectAtIndex:1];
pic.description = (NSString*) [arr objectAtIndex:2];
pic.imageData = (NSData*) [arr objectAtIndex:3];
pic.rate = [[NSDecimalNumber decimalNumberWithString:(NSString*) [arr objectAtIndex:4]] floatValue];
pic.numberOfRate = [[NSDecimalNumber decimalNumberWithString:(NSString*) [arr objectAtIndex:5]] intValue];
pic.numberOfDownload = [[NSDecimalNumber decimalNumberWithString:(NSString*) [arr objectAtIndex:6]] intValue];
pic.numberOfComment = [[NSDecimalNumber decimalNumberWithString:(NSString*) [arr objectAtIndex:7]] intValue];
[res addObject:pic];
[pic release];
}
self.picturesData = res;
//display a image
[self displayAImage];
[dataStr release];
}
但dataStr是在方法爲零。任何人都可以幫助我解決這個問題。任何幫助,將不勝感激。
謝謝。