自学教程：C++ CFNumberGetValue函数代码示例

//.........这里部分代码省略.........					junk = CFQDictionarySetNumber(interfaceInfo, kSortOrderKey, kEthernetPCISortOrder);					assert(junk == 0);										// Get "AAPL,slot-name" property from I/O Registry and copy it into 					// our interfaceInfo dictionary.  But first, mutate the slot name 					// into a user-visible name version.										slotName = NULL;					slotNameAsData = (CFDataRef) IORegistryEntryCreateCFProperty(bus, CFSTR("AAPL,slot-name"), NULL, kNilOptions);					if (slotNameAsData != NULL) {						slotName = CreateStringFromData(slotNameAsData);					}					if (slotName != NULL) {						CFStringRef tmp;												tmp = CopyUserVisibleSlotName(slotName);						if (tmp != NULL) {							CFQRelease(slotName);							slotName = tmp;						}					}					if (slotName == NULL) {						CFDictionarySetValue(interfaceInfo, CFSTR("AAPL,slot-name"), CFSTR("unknown"));					} else {						CFDictionarySetValue(interfaceInfo, CFSTR("AAPL,slot-name"), slotName);					}					CFQRelease(slotName);										// Now get the IOChildIndex property to decide whether it's a single 					// or multi-port Ethernet card.					portNum = (CFNumberRef) CFDictionaryGetValue(busDict, CFSTR("IOChildIndex"));						                if ( (portNum == NULL) || ! CFNumberGetValue(portNum, kCFNumberSInt32Type, &junkNum) ) {	                    // single-port pci enet card	                	// Either there is no IOChildIndex property, or it doesn't contain a 	                	// valid number.				        *userVisibleName = (CFStringRef) CFQRetain( kMoreSCPortLabelEthernetPCI );	                } else {	                	CFNumberRef portNumRef;	                	SInt32		portNum;	                	CFStringRef portNumString;	                		                    // multi-port pci enet card						// Get "IOChildIndex" property from I/O Registry and copy it into 						// our interfaceInfo dictionary.												portNumString = NULL;						portNumRef = (CFNumberRef) IORegistryEntryCreateCFProperty(bus, CFSTR("IOChildIndex"), NULL, kNilOptions);				        if ( (portNumRef != NULL) && CFNumberGetValue(portNumRef, kCFNumberSInt32Type, &portNum) ) {				            portNumString = CFStringCreateWithFormat(NULL, NULL, CFSTR("%ld"), portNum + 1);				        }						if (portNumString == NULL) {							CFDictionarySetValue(interfaceInfo, CFSTR("IOChildIndex"), CFSTR("unknown"));						} else {							CFDictionarySetValue(interfaceInfo, CFSTR("IOChildIndex"), portNumString);						}				        CFQRelease(portNumString);				        CFQRelease(portNumRef);				        *userVisibleName = (CFStringRef) CFQRetain( kMoreSCPortLabelEthernetPCIMultiport );	                }	            } else {

static void tests(void){    CFErrorRef error = NULL;    CFDataRef cfpassword = CFDataCreate(NULL, (uint8_t *) "FooFooFoo", 10);    CFDataRef cfwrong_password = CFDataCreate(NULL, (uint8_t *) "NotFooFooFoo", 10);    CFStringRef cfaccount = CFSTR("[email
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