我收到以下错误:
*由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'* + [NSString stringWithUTF8String:]:NULL cString'
在下面的代码行中:
NSString *aName = [NSString stringWithUTF8String(char*)sqlite3_column_text(compiledStatement, 1)];
我不确定这里发生了什么,我在SQL语句中引用的列包含数据。完整代码如下。
// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select ZROUTE_NAME from ZROUTE";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
{
// Loop through the results and add them to the Route Name array
while(sqlite3_step(compiledStatement) == SQLITE_ROW)
{
// Read the data from the result row
NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
// Add the animal object to the animals Array
//[list addObject:animal];
[list addObject:aName];
//[animal release];
}
}
else
{
NSLog(@"Error: failed to select details from database with message '%s'.", sqlite3_errmsg(database));
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
答案 0 :(得分:4)
啊啊:p - 我相信 - 如果你实施以下声明,你就不会遇到麻烦。
这绝不会像你提到的那样抛出异常 - *因未捕获的异常而终止应用程序'NSInvalidArgumentException',原因:'* + [NSString stringWithUTF8String:]:NULL cString'
但请记住 - 当空值时 - 您的字符串会有(null)
值
NSString *bName=[NSString stringWithFormat: @"%s",(char *)sqlite3_column_text(compiledStmt, 0)];
就是这样。 UpVote如果发现有帮助。 :)
答案 1 :(得分:3)
处理语句
的NULL指针条件if((char*)sqlite3_column_text(compiledStatement, 1) != NULL)
{
NSString *aName = [NSString stringWithUTF8String(char*)sqlite3_column_text(compiledStatement, 1)];
}
这将解决您的问题。
谢谢,
吉姆。