EXC_BAD_ACCESS從通訊錄添加聯繫人時？

Question

我有以下代碼：

ABAddressBookRef ab; 
ab = ABAddressBookCreate(); 
int len = (int) ABAddressBookGetPersonCount(ab); 
int i; 
for(i = 1; i < (len + 1); i++) 
{ 
    ABRecordRef person = ABAddressBookGetPersonWithRecordID(ab,(ABRecordID) i); 
    CFStringRef firstName, lastName; 
    firstName = ABRecordCopyValue(person, kABPersonFirstNameProperty); 
    lastName = ABRecordCopyValue(person, kABPersonLastNameProperty); 
    static char* fallback = ""; 
    int fbLength = strlen(fallback); 
    int firstNameLength = fbLength; 
    bool firstNameFallback = true; 
    int lastNameLength = fbLength; 
    bool lastNameFallback = true; 
    if (firstName != NULL) 
    { 
    firstNameLength = (int) CFStringGetLength(firstName); 
    firstNameFallback = false; 
    } 
    if (lastName != NULL) 
    { 
    lastNameLength = (int) CFStringGetLength(lastName); 
    lastNameFallback = false; 
    } 
    if (firstNameLength == 0) 
    { 
    firstNameLength = fbLength; 
    firstNameFallback = true; 
    } 
    if (lastNameLength == 0) 
    { 
    lastNameLength = fbLength; 
    lastNameFallback = true; 
    } 
    firstNameString = malloc(sizeof(char)*(firstNameLength+1)); 
    lastNameString = malloc(sizeof(char)*(lastNameLength+1)); 
    if (firstNameFallback == true) 
    { 
    strcpy(firstNameString, fallback); 
    } 
    else 
    { 
    CFStringGetCString(firstName, firstNameString, 10*CFStringGetLength(firstName), kCFStringEncodingASCII); 
    } 
    if (lastNameFallback == true) 
    { 
    strcpy(lastNameString, fallback); 
    } 
    else 
    { 
    CFStringGetCString(lastName, lastNameString, 10*CFStringGetLength(lastName), kCFStringEncodingASCII); 
    } 


    printf("%d.\t%s %s\n", i, firstNameString, lastNameString); 
    NSString *fname= [NSString stringWithFormat:@"%s",firstNameString]; 
    NSString *lname= [NSString stringWithFormat:@"%s",lastNameString]; 
    [dict setValue:fname forKey:@"fname"]; 
    [dict setValue:lname forKey:@"lname"]; 
    [self.arrname addObject:[dict copy]]; 

if (firstName != NULL) 
{ 
    CFRelease(firstName); 
} 
if (lastName != NULL) 
{ 
    CFRelease(lastName); 
} 

free(firstNameString); 
free(lastNameString); 

} 

它第一次運作良好。

但是，當我從聯繫人列表中刪除記錄，然後嘗試在以下語句中添加記錄我的應用程序清除。

firstName = ABRecordCopyValue(person, kABPersonFirstNameProperty); 

任何人都可以解決這個問題嗎？ 任何想法，不勝感激。

Answer 1

無法保證有效的ABRecordID從1開始，並在ABAddressBookGetPersonCount(addressBook)結束。您不能使用for循環使用ABRecordID。

取而代之，獲取包含所有使用ABAddressBookCopyArrayOfAllPeople的人的CFArray並對其進行迭代。

另一個意見是，你不應該使用C字符串;大部分的事情可以使用支持Unicode的開箱即用的CFString和NSString的API來完成。通過獲取指定kCFStringEncodingASCII的C字符串，基本上可以摧毀諸如é或ü，ગુજરાતી或案的字母。 （請注意，CFStringGetCString與kCFStringEncodingASCII相當挑剔並刪除不在ASCII中的字符;它不會給出字符串的UTF8表示形式。）許多人的名字中包含非ASCII字符。所以，請確實學習CFString和NSString方法。請注意，CFStringRef和NSString*可以自由互換。