是否可以通过底座连接器将 iMac 连接到 iPhone？我也在使用 EAAccessory 框架，但是当我将串行电缆连接到 iPhone 时，我没有收到任何通知。如果有人知道这件事，请给我一个建议。
【问题讨论】：
标签： iphone ios external-accessory
如果您将 iPhone 连接到 iMac 并且运行 iTunes 或 Xcode，您将能够看到 iPhone 已连接。
在 Xcode 中，转到管理器窗口。在 iTunes 中，查看左侧栏中的“设备”下方。
我没用过的EAAccessory框架应该和这个没什么关系。
【讨论】：
拉吉..
要获得连接附件的通知，首先您必须将您的附件注册到 MFI。否则你必须越狱你的 iPhone。越狱检查此代码
#include <stdio.h> /* Standard input/output definitions */
#include <string.h> /* String function definitions */
#include <unistd.h> /* UNIX standard function definitions */
#include <fcntl.h> /* File control definitions */
#include <errno.h> /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */
static struct termios gOriginalTTYAttrs;
static int OpenSerialPort()
{
int fileDescriptor = -1;
int handshake;
struct termios options;
// Open the serial port read/write, with no controlling terminal, and don't wait for a connection.
// The O_NONBLOCK flag also causes subsequent I/O on the device to be non-blocking.
// See open(2) ("man 2 open") for details.
fileDescriptor = open("/dev/tty.iap", O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fileDescriptor == -1)
{
printf("Error opening serial port %s - %s(%d).\n",
"/dev/tty.iap", strerror(errno), errno);
goto error;
}
// Note that open() follows POSIX semantics: multiple open() calls to the same file will succeed
// unless the TIOCEXCL ioctl is issued. This will prevent additional opens except by root-owned
// processes.
// See tty(4) ("man 4 tty") and ioctl(2) ("man 2 ioctl") for details.
if (ioctl(fileDescriptor, TIOCEXCL) == -1)
{
printf("Error setting TIOCEXCL on %s - %s(%d).\n",
"/dev/tty.iap", strerror(errno), errno);
goto error;
}
// Now that the device is open, clear the O_NONBLOCK flag so subsequent I/O will block.
// See fcntl(2) ("man 2 fcntl") for details.
if (fcntl(fileDescriptor, F_SETFL, 0) == -1)
{
printf("Error clearing O_NONBLOCK %s - %s(%d).\n",
"/dev/tty.iap", strerror(errno), errno);
goto error;
}
// Get the current options and save them so we can restore the default settings later.
if (tcgetattr(fileDescriptor, &gOriginalTTYAttrs) == -1)
{
printf("Error getting tty attributes %s - %s(%d).\n",
"/dev/tty.iap", strerror(errno), errno);
goto error;
}
// The serial port attributes such as timeouts and baud rate are set by modifying the termios
// structure and then calling tcsetattr() to cause the changes to take effect. Note that the
// changes will not become effective without the tcsetattr() call.
// See tcsetattr(4) ("man 4 tcsetattr") for details.
options = gOriginalTTYAttrs;
// Print the current input and output baud rates.
// See tcsetattr(4) ("man 4 tcsetattr") for details.
printf("Current input baud rate is %d\n", (int) cfgetispeed(&options));
printf("Current output baud rate is %d\n", (int) cfgetospeed(&options));
// Set raw input (non-canonical) mode, with reads blocking until either a single character
// has been received or a one second timeout expires.
// See tcsetattr(4) ("man 4 tcsetattr") and termios(4) ("man 4 termios") for details.
cfmakeraw(&options);
options.c_cc[VMIN] = 1;
options.c_cc[VTIME] = 10;
// The baud rate, word length, and handshake options can be set as follows:
cfsetspeed(&options, B19200); // Set 19200 baud
options.c_cflag |= (CS8); // RTS flow control of input
printf("Input baud rate changed to %d\n", (int) cfgetispeed(&options));
printf("Output baud rate changed to %d\n", (int) cfgetospeed(&options));
// Cause the new options to take effect immediately.
if (tcsetattr(fileDescriptor, TCSANOW, &options) == -1)
{
printf("Error setting tty attributes %s - %s(%d).\n",
"/dev/tty.iap", strerror(errno), errno);
goto error;
}
// Success
return fileDescriptor;
// Failure "/dev/tty.iap"
error:
if (fileDescriptor != -1)
{
close(fileDescriptor);
}
return -1;
}
int main(int args, char *argv[])
{
int fd;
char somechar[8];
fd=OpenSerialPort(); // Open tty.iap with no hardware control, 8 bit, BLOCKING and at 19200 baud
if(fd>-1)
{
write(fd,"*",1); // Write handshaking message over serial
///////////////////////////////////////////////////////////////////////////////////////////////////
// After this, our device or our PC program should be strobing serial ground to gain access to the Iphone Serial Line
//////////////////////////////////////////////////////////////////////////////////////////////////
read(fd,&somechar[0],1); // Read 1 byte over serial. This will block (wait) untill the byte has been received
if(somechar[0]=='*') // Check if this byte is a "handshaking" message
{
printf("Serial connection established!\n"); // If it is, we have established a connection to the device and can freely read/write over serial!
while(1) // Do this forever or untill someone presses CTRL+C
{
read(fd,&somechar[0],1); // Read a character over serial!
putchar(somechar[0]); // Write the character to the Terminal!!
}
}
}
return 0;
}
【讨论】：
对于 EAAccessoryManager 及其附带的类，似乎存在很多混淆。这些仅适用于 MFI 认可的硬件，即那些花时间遵循 MFI 计划并将必要的硬件集成到其设备中的制造商。
使用芯片和建立协议可以促进应用和设备之间的通信流。
Sam 在他的陈述中是正确的，但是没有必要越狱您的应用程序以绕过 MFI 程序但是，如果您按照我将简要介绍的程序进行操作，您将无法提交到 App Store：
我已经在 iOS 设备上成功实现了 IOKit 操作，所以只要你愿意放弃提交到 App Store，这绝对是可能的。
【讨论】：
答案如下：Launch specific app when external accessory attached - 并非所有配件都可以在连接时发出启动应用程序的信号。我认为普通的USB线也不能。
关于 IOKit：您可以从 Xcode 本身添加必要的文件 - 打开 Xcode.app 包。 IOKit 框架位于 Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks 只需将缺少的文件（或制作链接）复制到
Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/System/Library/Frameworks/IOKit.framework
到
Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk/System/Library/Frameworks/IOKit.framework
也适用于所有模拟器平台
您应该知道，由于 iOS 沙盒的安全性，并非 IOKit 的所有功能都可以在真实设备上运行（但它们可以在模拟器下运行）。 但是您可以很好地使用 IORegistry。我在 iOS 上的第一个项目是 IORegistryExplorer 的实现。 祝你好运！
【讨论】：