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Language: Objective C Just like the title, I wanna implement the functionality that can keep user from clicking the exit button by mistake. And it should show some words together like this: "Do you want to close the program?" Button "Yes", Button "No" Is any method I can use? Thank in advance. Where should I put this code?And how to make the actions of those buttons in alert window?

The following is my code to show text in textview. But the error, EXC_BAD_INSTRUCTION, happens while executing it. How does this error happen and how could I fix it? dispatch_sync(dispatch_get_main_queue(), ^{ [[[Memo1 textStorage] mutableString]appendString:[NSString stringWithFormat:@"%@", str]]; [Memo1 scrollRangeToVisible:NSMakeRange(Memo1.string.length, 0)];//auto scroll down });

IDE: Xcode I have the following code in my program sending this command in terminal. Program hangs up on this line and the debug area shows error "no module named pyvisa_py". (power_max.py import the pyvisa module) Then I try this command in terminal directly and the module pyvisa_py, installed already, can be found. The python file can be executed successfully. How could I make Xcode identify the pyvisa_py module? [cmd appendString:@“python3 /Users/shared/power_max.py”];     [cmd appendString:[Paremeter_IP stringValue]];     [cmd appendString:@" > /users/Shared/CMW.txt"];     system([cmd UTF8String]);

I have a button that starts tests. The items, test no, min and max are added to the table_array and refresh table to show them. Following code runs without error. index++; //if([[Elect objectAtIndex:index]isEqualToString:@"1"]) item++; temp = [self GetDCVoltage_34970:1]; if(temp >= [[Min objectAtIndex:index]floatValue] && temp <= [[Max objectAtIndex:index]floatValue]) [table_status addObject:@"Pass"]; else { PF=false; [table_status addObject:@"Fail"]; err=101+item; [errcode setIntValue:err]; } [table_no addObject:[NSString stringWithFormat:@"%d",item]]; [self Show_Datagrid:index]; [table_value addObject:[NSString stringWithFormat:@"%.3f",temp]]; [Test_value replaceObjectAtIndex:index withObject:[NSString stringWithFormat:@"%.3f",temp]]; [self refreshTable]; //if (continue_test.state==0 && PF==false) //return; return; After I removed some lines, I only remain the lines that add objects to table_array. Then it shows up error: Thread1: EXE_BAD_INSTRUTION after I pressed button. [table_no addObject:[NSString stringWithFormat:@"%d",item]]; [self Show_Datagrid:index]; [table_value addObject:[NSString stringWithFormat:@"%.3f",temp]]; [Test_value replaceObjectAtIndex:index withObject:[NSString stringWithFormat:@"%.3f",temp]]; [self refreshTable];

I hope the table column show the values after I pressed the button. The following is the IBAction Button. - (IBAction)buttonTapped:(id)sender { //Filling the arrays Test_name = [NSArray arrayWithObjects:@"test_item_a",@"b",@"c",@"Current",nil]; Min = [NSArray arrayWithObjects:@"0.5",@"0.7",@"0.8",@"100",nil]; Max = [NSArray arrayWithObjects:@"5",@"5",@"9",@"140",nil]; uint16 index = 0; NSInteger i = 0; //Show_Datagrid this function move the above values to another 3 arrays table_item, //table_min, table_max. And the following code is just to verify the value. [self Show_Datagrid:index]; [self showMeg:@"Button Tapped!2\n"]; [self showMeg:[table_item objectAtIndex:0]]; [self showMeg:@"\n"]; [self showMeg:[table_min objectAtIndex:0]]; [self showMeg:@"\n"]; [self showMeg:Column_test_item.identifier]; //call this function to show the values in tableview. [self tableView:_tableview objectValueForTableColumn:Column_test_item row:i]; } following is the function (Column_test_item.identifier is verified correct.): -(id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex { if ([aTableColumn.identifier isEqualToString:@"no"]) return [table_no objectAtIndex:rowIndex]; if ([aTableColumn.identifier isEqualToString:@"item"]) return [table_item objectAtIndex:rowIndex]; if ([aTableColumn.identifier isEqualToString:@"min"]) return [table_min objectAtIndex:rowIndex]; if ([aTableColumn.identifier isEqualToString:@"max"]) return [table_max objectAtIndex:rowIndex]; if ([aTableColumn.identifier isEqualToString:@"value"]) return [table_value objectAtIndex:rowIndex]; if ([aTableColumn.identifier isEqualToString:@"status"]) return [table_status objectAtIndex:rowIndex]; return [table_no objectAtIndex:rowIndex]; } I thnik I called that function in wrong way. Shouldn't I input NSTableColumn parameter Column_test_item directly? Column_test_item is an IBOutlet I connected to the specfic test item column. And how does this function know which column it want to fill up the value, based on the second parameter I input?

What does the circle mean in front of the line (following image)? How could I remove or create it?

Show-message function got error: Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) following is the function. -(void)showMeg:(NSString *)str { dispatch_sync(dispatch_get_main_queue(), ^{ [[[Memo1 textStorage] mutableString]appendString:[NSString stringWithFormat:@"%@", str]]; [Memo1 scrollRangeToVisible:NSMakeRange(Memo1.string.length, 0)];//auto scroll down }); } I called it in other .m file like the following. -(void)showMeg:(NSString *)str { dispatch_sync(dispatch_get_main_queue(), ^{ [[[Memo1 textStorage] mutableString]appendString:[NSString stringWithFormat:@"%@", str]]; [Memo1 scrollRangeToVisible:NSMakeRange(Memo1.string.length, 0)];//auto scroll down }); }