当我将以下命令行程序从main.m重命名为main.mm时,我得到了奇怪的代码错误。作为main.m正常工作。谁知道为什么?
https://stackoverflow.com/a/36469891/105539
#import <Foundation/Foundation.h>
void detectNewFile (
ConstFSEventStreamRef streamRef,
void *clientCallBackInfo,
size_t numEvents,
void *eventPaths,
const FSEventStreamEventFlags eventFlags[],
const FSEventStreamEventId eventIds[])
{
int i;
char **paths = eventPaths;
printf("GOT AN EVENT!!!!\n");
for (i=0; i<numEvents; i++) {
printf("Change %llu in %s, flags %u\n", eventIds[i], paths[i], (unsigned int)eventFlags[i]);
}
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
short nPathCount = 2;
CFStringRef mypath[nPathCount];
mypath[0] = CFSTR("/Users/mike/Documents");
mypath[1] = CFSTR("/Users/mike/Downloads");
CFArrayRef pathsToWatch = CFArrayCreate(NULL, (const void **)&mypath, nPathCount, NULL);
void *callbackInfo = NULL;
CFAbsoluteTime latency = 1.0; // seconds
FSEventStreamRef hStream = FSEventStreamCreate(NULL,
&detectNewFile,
callbackInfo,
pathsToWatch,
kFSEventStreamEventIdSinceNow,
latency,
kFSEventStreamCreateFlagFileEvents
);
FSEventStreamScheduleWithRunLoop(hStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
FSEventStreamStart(hStream);
printf("Waiting on new file creations...\n");
CFRunLoopRun(); // runs in an endless loop, only letting the callback function run
} // end autorelease pool
return 0;
}
FOR:
char **paths = eventPaths;
Cannot initialize a variable of type 'char **' with an lvalue of type 'void *'
FOR:
FSEventStreamRef hStream = FSEventStreamCreate(NULL,
&detectNewFile,
callbackInfo,
pathsToWatch,
kFSEventStreamEventIdSinceNow,
latency,
kFSEventStreamCreateFlagFileEvents
);
No matching function for call to 'FSEventStreamCreate'