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先生，我正在使用数据库连接我已经编写了所有代码并且我还导入了头文件。但是它显示了在架构中找不到的 sqlite3_exe 符号行中的错误

帮我清除...!!!!

 NSFileManager *filemgr=[NSFileManager defaultManager];
if ([filemgr fileExistsAtPath:databasePath]==NO)
{
    const char *dbpath=[databasePath UTF8String];
    if (sqlite3_open(dbpath, &contactDB)==SQLITE_OK)
    {
        char *errorMsg;
        const char *sql_stmt="CREATE TABLE IF NOT EXISTS CONTACTS (ID INTEGER PRIMARY KEY AUTOINCREMENT,  NAME TEXT, ADDRESS TEXT, PHONE NUMERIC)";
        if (sqlite3_exe(contactDB, sql_stmt, NULL,NULL, &errorMsg)!=SQLITE_OK)
        {
            status.text=@"Failed to crate table";
        }
        sqlite3_close(contactDB);
    }else {
        status.text=@"Faild to open/create database";
    }
}

错误行是

if (sqlite3_exe(contactDB, sql_stmt, NULL,NULL, &errorMsg)!=SQLITE_OK)

警告是函数“sqlite3_exe”的隐式声明在 c99 中无效。错误是架构 i386 的未定义符号：

 "_sqlite3_exe", referenced from:
  -[DatabaseViewController viewDidLoad] in DatabaseViewController.o

ld：未找到体系结构 i386 的符号 clang：错误：链接器命令失败，退出代码为 1（使用 -v 查看调用）

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2 回答 2

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它是 sqlite3_exec。不是 sqlite3_exe。请检查。exe中缺少“C”。

于 2012-10-17T08:02:34.813 回答
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这是相同的示例代码。您可以在此处录制音频。你可以

#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]

    - (void) startRecording{

    UIBarButtonItem *stopButton = [[UIBarButtonItem alloc] initWithTitle:@"Stop" style:UIBarButtonItemStyleBordered  target:self action:@selector(stopRecording)];
    self.navigationItem.rightBarButtonItem = stopButton;
    [stopButton release];

    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    NSError *err = nil;
    [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
    if(err){
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        return;
    }
    [audioSession setActive:YES error:&err];
    err = nil;
    if(err){
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        return;
    }

    recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];



    // Create a new dated file
    NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];
    NSString *caldate = [now description];
    recorderFilePath = [[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain];

    NSURL *url = [NSURL fileURLWithPath:recorderFilePath];
    err = nil;
    recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err];
    if(!recorder){
        NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        UIAlertView *alert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: [err localizedDescription]
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }

    //prepare to record
    [recorder setDelegate:self];
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;

    BOOL audioHWAvailable = audioSession.inputIsAvailable;
    if (! audioHWAvailable) {
        UIAlertView *cantRecordAlert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: @"Audio input hardware not available"
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [cantRecordAlert show];
        [cantRecordAlert release]; 
        return;
    }

    // start recording
    [recorder recordForDuration:(NSTimeInterval) 10];

    }

    - (void) stopRecording{

    [recorder stop];

    NSURL *url = [NSURL fileURLWithPath: recorderFilePath];
    NSError *err = nil;
    NSData *audioData = [NSData dataWithContentsOfFile:[url path] options: 0 error:&err];
    if(!audioData)
        NSLog(@"audio data: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
    [editedObject setValue:[NSData dataWithContentsOfURL:url] forKey:editedFieldKey];   

    //[recorder deleteRecording];


    NSFileManager *fm = [NSFileManager defaultManager];

    err = nil;
    [fm removeItemAtPath:[url path] error:&err];
    if(err)
        NSLog(@"File Manager: %@ %d %@", [err domain], [err code], [[err userInfo] description]);



    UIBarButtonItem *startButton = [[UIBarButtonItem alloc] initWithTitle:@"Record" style:UIBarButtonItemStyleBordered  target:self action:@selector(startRecording)];
    self.navigationItem.rightBarButtonItem = startButton;
    [startButton release];

    }

    - (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag
    {

    NSLog (@"audioRecorderDidFinishRecording:successfully:");
    // your actions here

    }

对于播放您可以在停止录制方法中使用这些行：

NSURL* musicFile = [NSURL fileURLWithPath:[[NSBundle mainBundle] 
                                               pathForResource:@"click"
                                               ofType:@"caf"]];
    AVAudioPlayer *click = [[AVAudioPlayer alloc] initWithContentsOfURL:musicFile error:nil];
    [click play];
    [click release];

确保将录制的声音路径的正确 URL 传递到应用程序中。这些台词将在音频播放器中为您播放。

于 2012-10-22T11:51:50.530 回答