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当我试图编译程序本想出了：GCC编译错误
C:\Users\Mohit\Developer\C_Workspace\iPhoneInteraction\Debug>make all
Building file: ../src/test.c
Invoking: Cygwin C Compiler
gcc -I"C:\cygwin\usr\include" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"s
rc/test.d" -MT"src/test.d" -o"src/test.o" "../src/test.c"
cygwin warning:
MS-DOS style path detected: C:/cygwin/usr/include
Preferred POSIX equivalent is: /usr/include
CYGWIN environment variable option "nodosfilewarning" turns off this warning.
Consult the user's guide for more details about POSIX paths:
http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
Finished building: ../src/test.c
Building target: iPhoneInteraction.exe
Invoking: Cygwin C Linker
gcc -o"iPhoneInteraction.exe" ./src/test.o
./src/test.o: In function print_device':
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:70: undefined reference to '_usb_open'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:73: undefined reference to '_usb_get_string_simple'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:84: undefined reference to '_usb_get_string_simple'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:104: undefined reference to '_usb_get_string_simple'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:112: undefined reference to '_usb_close'
./src/test.o: In function 'main':
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:137: undefined reference to '_usb_init'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:139: undefined reference to '_usb_find_busses'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:140: undefined reference to '_usb_find_devices'
/cygdrive/c/Users/Mohit/Developer/C_Workspace/iPhoneInteraction/Debug/../src/tes
t.c:142: undefined reference to '_usb_get_busses'
collect2: ld returned 1 exit status
make: *** [iPhoneInteraction.exe] Error 1
这里是我的代码，上面的方法错误是所有功能来自：
/*
* testlibusb.c
*
* Test suite program
*/
#include <stdio.h>
#include <string.h>
#include <usb.h>
int verbose = 0;
void print_endpoint(struct usb_endpoint_descriptor *endpoint)
{
printf(" bEndpointAddress: %02xh\n", endpoint->bEndpointAddress);
printf(" bmAttributes: %02xh\n", endpoint->bmAttributes);
printf(" wMaxPacketSize: %d\n", endpoint->wMaxPacketSize);
printf(" bInterval: %d\n", endpoint->bInterval);
printf(" bRefresh: %d\n", endpoint->bRefresh);
printf(" bSynchAddress: %d\n", endpoint->bSynchAddress);
}
void print_altsetting(struct usb_interface_descriptor *interface)
{
int i;
printf(" bInterfaceNumber: %d\n", interface->bInterfaceNumber);
printf(" bAlternateSetting: %d\n", interface->bAlternateSetting);
printf(" bNumEndpoints: %d\n", interface->bNumEndpoints);
printf(" bInterfaceClass: %d\n", interface->bInterfaceClass);
printf(" bInterfaceSubClass: %d\n", interface->bInterfaceSubClass);
printf(" bInterfaceProtocol: %d\n", interface->bInterfaceProtocol);
printf(" iInterface: %d\n", interface->iInterface);
for (i = 0; i < interface->bNumEndpoints; i++)
print_endpoint(&interface->endpoint[i]);
}
void print_interface(struct usb_interface *interface)
{
int i;
for (i = 0; i < interface->num_altsetting; i++)
print_altsetting(&interface->altsetting[i]);
}
void print_configuration(struct usb_config_descriptor *config)
{
int i;
printf(" wTotalLength: %d\n", config->wTotalLength);
printf(" bNumInterfaces: %d\n", config->bNumInterfaces);
printf(" bConfigurationValue: %d\n", config->bConfigurationValue);
printf(" iConfiguration: %d\n", config->iConfiguration);
printf(" bmAttributes: %02xh\n", config->bmAttributes);
printf(" MaxPower: %d\n", config->MaxPower);
for (i = 0; i < config->bNumInterfaces; i++)
print_interface(&config->interface[i]);
}
int print_device(struct usb_device *dev, int level)
{
usb_dev_handle *udev;
char description[256];
char string[256];
int ret, i;
udev = usb_open(dev);
if (udev) {
if (dev->descriptor.iManufacturer) {
ret = usb_get_string_simple(udev, dev->descriptor.iManufacturer, string, sizeof(string));
if (ret > 0)
snprintf(description, sizeof(description), "%s - ", string);
else
snprintf(description, sizeof(description), "%04X - ",
dev->descriptor.idVendor);
} else
snprintf(description, sizeof(description), "%04X - ",
dev->descriptor.idVendor);
if (dev->descriptor.iProduct) {
ret = usb_get_string_simple(udev, dev->descriptor.iProduct, string, sizeof(string));
if (ret > 0)
snprintf(description + strlen(description), sizeof(description) -
strlen(description), "%s", string);
else
snprintf(description + strlen(description), sizeof(description) -
strlen(description), "%04X", dev->descriptor.idProduct);
} else
snprintf(description + strlen(description), sizeof(description) -
strlen(description), "%04X", dev->descriptor.idProduct);
} else
snprintf(description, sizeof(description), "%04X - %04X",
dev->descriptor.idVendor, dev->descriptor.idProduct);
printf("%.*sDev #%d: %s\n", level * 2, " ", dev->devnum,
description);
if (udev && verbose) {
if (dev->descriptor.iSerialNumber) {
ret = usb_get_string_simple(udev, dev->descriptor.iSerialNumber, string, sizeof(string));
if (ret > 0)
printf("%.*s - Serial Number: %s\n", level * 2,
" ", string);
}
}
if (udev)
usb_close(udev);
if (verbose) {
if (!dev->config) {
printf(" Couldn't retrieve descriptors\n");
return 0;
}
for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
print_configuration(&dev->config[i]);
} else {
for (i = 0; i < dev->num_children; i++)
print_device(dev->children[i], level + 1);
}
return 0;
}
int main(int argc, char *argv[])
{
struct usb_bus *bus;
if (argc > 1 && !strcmp(argv[1], "-v"))
verbose = 1;
usb_init();
usb_find_busses();
usb_find_devices();
for (bus = usb_busses; bus; bus = bus->next) {
if (bus->root_dev && !verbose)
print_device(bus->root_dev, 0);
else {
struct usb_device *dev;
for (dev = bus->devices; dev; dev = dev->next)
print_device(dev, 0);
}
}
return 0;
}
没有什么，我赶上我的代码是错的。有什么建议么？