@implementation NSString (Empty) - (BOOL) empty{ return ([[self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]length] == 0); } @end chown 另一个选择是使用isEqualToString检查是否等于@"",就像这样: 1 2 3 4 5 if ([myString isEqualToString:@""]) { NSLog...
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cause if it wasnt for cause it brings news cause its just not fe cause its late and yo cause its not me cause its not my faul cause love could neve cause my heart is cry cause no one else can cause nothin cause obstruction in cause of large loss cause ones own defeat cause overstock...
* @return{@codetrue}ifthe CharSequence is empty or null * @since 3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence) */ public static boolean isEmpty(final CharSequence cs) { returncs == null || cs.leng...
"), MB_YESNO) == IDNO) {// Give the user a chance if he has unknowingly hit the// Cancel button. If he says No, return. Don't reset. If// Yes, go ahead and reset the values and close the dialog.return; } m_nMyValue = m_nPrevValue; m_pMyString =NULL; CDialog::On...
If he says No, return. Don't reset. If // Yes, go ahead and reset the values and close the dialog. return; } m_nMyValue = m_nPrevValue; m_pMyString = NULL; CDialog::OnCancel(); } CDialog::OnInitDialogThis method is called in response to the WM_INITDIALOG message....
strCaption [in] The string that the CTaskDialog displays to the user. Use this string to explain the purpose of the command.bEnabled [in] A Boolean parameter that indicates if the new button is enabled or disabled.bRequiresElevation [in] A Boolean parameter that indicates whether a command ...
fgetws() — Get a wide-character string fileno() — Get the file descriptor from an open stream finite() — Determine the infinity classification of a floating-point number __flbf() — Determine if a stream is line buffered fldata() — Retrieve file information flocate() — Locat...
// Open a recordset; first record is current // Open a recordset; first record is current CCustomer rsCustSet(&m_dbCust); rsCustSet.Open(); if(rsCustSet.IsBOF()) return; // The recordset is empty // Scroll to the end of the recordset, past // the last record, so no record ...
This article will explain several methods of how to check if a string contains a given substring in C.Use the strstr Function to Check if a String Contains a Substring in CThe strstr function is part of the C standard library string facilities, and it’s defined in the <string.h> ...