我正在做一个项目，我需要 USB 端口与外部设备通信。我一直在网上寻找示例（Apple 和 /developer/IOKit/usb 示例）并尝试其他一些示例，但我什至找不到该设备。
在我的代码中，我在函数使用函数查找下一个迭代器（实际上是指针）的地方阻塞getNextIterator；但它永远不会返回一个好的值，所以代码是阻塞的。顺便说一句，我正在使用工具链并在我的项目中添加了 IOKit.framework。我现在想要的只是与 USB 总线上的某人通信或执行 ping 操作！我正在阻止FindDevice...我无法进入while循环，因为变量usbDevice始终 = 到 0...我已经在一个小型 mac 程序中测试了我的代码并且它可以工作...
这是我的代码：
IOReturn ConfigureDevice(IOUSBDeviceInterface **dev) {
UInt8 numConfig;
IOReturn result;
IOUSBConfigurationDescriptorPtr configDesc;
//Get the number of configurations
result = (*dev)->GetNumberOfConfigurations(dev, &numConfig);
if (!numConfig) {
return -1;
}
// Get the configuration descriptor
result = (*dev)->GetConfigurationDescriptorPtr(dev, 0, &configDesc);
if (result) {
NSLog(@"Couldn't get configuration descriptior for index %d (err=%08x)\n", 0, result);
return -1;
}
#ifdef OSX_DEBUG
NSLog(@"Number of Configurations: %d\n", numConfig);
#endif
// Configure the device
result = (*dev)->SetConfiguration(dev, configDesc->bConfigurationValue);
if (result)
{
NSLog(@"Unable to set configuration to value %d (err=%08x)\n", 0, result);
return -1;
}
return kIOReturnSuccess;
}
IOReturn FindInterfaces(IOUSBDeviceInterface **dev, IOUSBInterfaceInterface ***itf) {
IOReturn kr;
IOUSBFindInterfaceRequest request;
io_iterator_t iterator;
io_service_t usbInterface;
IOUSBInterfaceInterface **intf = NULL;
IOCFPlugInInterface **plugInInterface = NULL;
HRESULT res;
SInt32 score;
UInt8 intfClass;
UInt8 intfSubClass;
UInt8 intfNumEndpoints;
int pipeRef;
CFRunLoopSourceRef runLoopSource;
NSLog(@"Debut FindInterfaces \n");
request.bInterfaceClass = kIOUSBFindInterfaceDontCare;
request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
request.bAlternateSetting = kIOUSBFindInterfaceDontCare;
kr = (*dev)->CreateInterfaceIterator(dev, &request, &iterator);
usbInterface = IOIteratorNext(iterator);
IOObjectRelease(iterator);
NSLog(@"Interface found.\n");
kr = IOCreatePlugInInterfaceForService(usbInterface, kIOUSBInterfaceUserClientTypeID, kIOCFPlugInInterfaceID, &plugInInterface, &score);
kr = IOObjectRelease(usbInterface); // done with the usbInterface object now that I have the plugin
if ((kIOReturnSuccess != kr) || !plugInInterface)
{
NSLog(@"unable to create a plugin (%08x)\n", kr);
return -1;
}
// I have the interface plugin. I need the interface interface
res = (*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(kIOUSBInterfaceInterfaceID), (LPVOID*) &intf);
(*plugInInterface)->Release(plugInInterface); // done with this
if (res || !intf)
{
NSLog(@"couldn't create an IOUSBInterfaceInterface (%08x)\n", (int) res);
return -1;
}
// Now open the interface. This will cause the pipes to be instantiated that are
// associated with the endpoints defined in the interface descriptor.
kr = (*intf)->USBInterfaceOpen(intf);
if (kIOReturnSuccess != kr)
{
NSLog(@"unable to open interface (%08x)\n", kr);
(void) (*intf)->Release(intf);
return -1;
}
kr = (*intf)->CreateInterfaceAsyncEventSource(intf, &runLoopSource);
if (kIOReturnSuccess != kr)
{
NSLog(@"unable to create async event source (%08x)\n", kr);
(void) (*intf)->USBInterfaceClose(intf);
(void) (*intf)->Release(intf);
return -1;
}
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopDefaultMode);
if (!intf)
{
NSLog(@"Interface is NULL!\n");
} else
{
*itf = intf;
}
NSLog(@"End of FindInterface \n \n");
return kr;
}
unsigned int FindDevice(void *refCon, io_iterator_t iterator) {
kern_return_t kr;
io_service_t usbDevice;
IOCFPlugInInterface **plugInInterface = NULL;
HRESULT result;
SInt32 score;
UInt16 vendor;
UInt16 product;
UInt16 release;
unsigned int count = 0;
NSLog(@"Searching Device....\n");
while (usbDevice = IOIteratorNext(iterator))
{
// create intermediate plug-in
NSLog(@"Found a device!\n");
kr = IOCreatePlugInInterfaceForService(usbDevice,
kIOUSBDeviceUserClientTypeID,
kIOCFPlugInInterfaceID,
&plugInInterface, &score);
kr = IOObjectRelease(usbDevice);
if ((kIOReturnSuccess != kr) || !plugInInterface) {
NSLog(@"Unable to create a plug-in (%08x)\n", kr);
continue;
}
// Now create the device interface
result = (*plugInInterface)->QueryInterface(plugInInterface,
CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID),
(LPVOID)&dev);
// Don't need intermediate Plug-In Interface
(*plugInInterface)->Release(plugInInterface);
if (result || !dev) {
NSLog(@"Couldn't create a device interface (%08x)\n",
(int)result);
continue;
}
// check these values for confirmation
kr = (*dev)->GetDeviceVendor(dev, &vendor);
kr = (*dev)->GetDeviceProduct(dev, &product);
//kr = (*dev)->GetDeviceReleaseNumber(dev, &release);
//if ((vendor != LegoUSBVendorID) || (product != LegoUSBProductID) || (release != LegoUSBRelease)) {
if ((vendor != LegoUSBVendorID) || (product != LegoUSBProductID))
{
NSLog(@"Found unwanted device (vendor = %d != %d, product = %d != %d, release = %d)\n",
vendor, kUSBVendorID, product, LegoUSBProductID, release);
(void) (*dev)->Release(dev);
continue;
}
// Open the device to change its state
kr = (*dev)->USBDeviceOpen(dev);
if (kr == kIOReturnSuccess) {
count++;
} else {
NSLog(@"Unable to open device: %08x\n", kr);
(void) (*dev)->Release(dev);
continue;
}
// Configure device
kr = ConfigureDevice(dev);
if (kr != kIOReturnSuccess) {
NSLog(@"Unable to configure device: %08x\n", kr);
(void) (*dev)->USBDeviceClose(dev);
(void) (*dev)->Release(dev);
continue;
}
break;
}
return count;
}
// USB rcx Init
IOUSBInterfaceInterface** osx_usb_rcx_init (void)
{
CFMutableDictionaryRef matchingDict;
kern_return_t result;
IOUSBInterfaceInterface **intf = NULL;
unsigned int device_count = 0;
// Create master handler
result = IOMasterPort(MACH_PORT_NULL, &gMasterPort);
if (result || !gMasterPort)
{
NSLog(@"ERR: Couldn't create master I/O Kit port(%08x)\n", result);
return NULL;
}
else {
NSLog(@"Created Master Port.\n");
NSLog(@"Master port 0x:08X \n \n", gMasterPort);
}
// Set up the matching dictionary for class IOUSBDevice and its subclasses
matchingDict = IOServiceMatching(kIOUSBDeviceClassName);
if (!matchingDict) {
NSLog(@"Couldn't create a USB matching dictionary \n");
mach_port_deallocate(mach_task_self(), gMasterPort);
return NULL;
}
else {
NSLog(@"USB matching dictionary : %08X \n", matchingDict);
}
CFDictionarySetValue(matchingDict, CFSTR(kUSBVendorID),
CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &LegoUSBVendorID));
CFDictionarySetValue(matchingDict, CFSTR(kUSBProductID),
CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &LegoUSBProductID));
result = IOServiceGetMatchingServices(gMasterPort, matchingDict, &gRawAddedIter);
matchingDict = 0; // this was consumed by the above call
// Iterate over matching devices to access already present devices
NSLog(@"RawAddedIter : 0x:%08X \n", &gRawAddedIter);
device_count = FindDevice(NULL, gRawAddedIter);
if (device_count == 1)
{
result = FindInterfaces(dev, &intf);
if (kIOReturnSuccess != result)
{
NSLog(@"unable to find interfaces on device: %08x\n", result);
(*dev)->USBDeviceClose(dev);
(*dev)->Release(dev);
return NULL;
}
// osx_usb_rcx_wakeup(intf);
return intf;
}
else if (device_count > 1)
{
NSLog(@"too many matching devices (%d) !\n", device_count);
}
else
{
NSLog(@"no matching devices found\n");
}
return NULL;
}
int main(int argc, char *argv[])
{
int returnCode;
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSLog(@"Debut du programme \n \n");
osx_usb_rcx_init();
NSLog(@"Fin du programme \n \n");
return 0;
// returnCode = UIApplicationMain(argc, argv, @"Untitled1App", @"Untitled1App");
// [pool release];
// return returnCode;
}