iOS : Could not convert const char to NSString object
<p><p>我需要将 const char 类型数据转换为 NSString 对象类型，因为 sqlite 数据库返回 char * 类型数据。为此，我使用了 NSString 类方法 stringWithUTF8strin 但它是
返回 NULL。它获取 sqlite 文本类型数据。</p>
<p>这是我的代码:</p>
<pre><code>-(void)getAllData:(const char *)sqlQuery
{
name=[init];
department=[init];
image=[init];
testimonial=[init];
@try
{
NSArray *pathArray=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *final_phone_path=[stringByAppendingPathComponent:@"amarinf5_excel.sqlite"];
NSLog(@"%@",final_phone_path);
NSFileManager *myFileManager=;
if(!)
{
NSLog(@"file doesnot exist");
}
if( sqlite3_open(, &dataBAse)!=SQLITE_OK)
{
NSLog(@"could not be able to open the file");
}
const char *sql=sqlQuery;
sqlite3_stmt *statement;
if(sqlite3_prepare_v2(dataBAse, sql, -1, &statement, nil)!=SQLITE_OK)
{
NSLog(@"Error message fail to prepare statement %s",sqlite3_errmsg(dataBAse));
}
while(sqlite3_step(statement)==SQLITE_ROW)
{
const char *name1=(char *)sqlite3_column_text(statement, 0);
const char *deprtment1=(char *)sqlite3_column_text(statement, 1);
const char *image1= (char *)sqlite3_column_text(statement, 2);
**const char *testimonial1=(char *)sqlite3_column_text(statement, 3);
NSLog(@"%@",);**
NSLog(@"%s",testimonial1);
NSLog(@"%@",);
];
];
];
//];
NSLog(@"%@",);
}
if (sqlite3_finalize(statement) != SQLITE_OK)
{
NSLog(@"Failed to finalize data statement, normally error handling here.");
}
if (sqlite3_close(dataBAse) != SQLITE_OK)
{
NSLog(@"Failed to close database, normally error handling here.");
}
}
@catch (NSException *exception) {
NSLog(@"An exception occurred: %@", );
}
@finally {
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>当我使用 stringWithFormat 方法找到不同的 NSString 解决方案时，下面是我的代码</p>
<pre><code> while(sqlite3_step(statement1)==SQLITE_ROW)
{
const char *name1=(char *)sqlite3_column_text(statement1, 0);
const char *deprtment1=(char *)sqlite3_column_text(statement1, 1);
const char *image1= (char *)sqlite3_column_text(statement1, 2);
const char *testimonial1=(char *)sqlite3_column_text(statement1, 3);
];
];
];
];
}
</code></pre></p>
<p style="font-size: 20px;">关于iOS : Could not convert const char to NSString object，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/24077734/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/24077734/
</a>
</p>
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