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successfully claim printer interace

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This commit is contained in:
Martin Brodbeck 2018-08-06 09:59:06 +02:00
parent 76d6c7c069
commit f71f257eb0
5 changed files with 60 additions and 28 deletions
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62
src/printer/posprinter.cpp
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@ -4,9 +4,7 @@
#include <iostream>
#include <string>
PosPrinter::PosPrinter() : PosPrinter(std::pair<int, int>{0x0456, 0x0808}) {}
PosPrinter::PosPrinter(std::pair<int, int> vendorModelId)
PosPrinter::PosPrinter()
{
int retValue;
@ -15,17 +13,50 @@ PosPrinter::PosPrinter(std::pair<int, int> vendorModelId)
throw std::runtime_error("Init error");
}
// libusb_set_debug(contextPtr_, 3); // set verbosity level to 3, as suggested in the
// documentation
libusb_device** devList;
int devCount = libusb_get_device_list(contextPtr_, &devList);
if (devCount <= 0) {
libusb_exit(contextPtr_);
throw std::runtime_error("Could not receive device list");
}
int numDevice = -1;
for (int i = 0; i < devCount; ++i) {
libusb_device_descriptor desc;
libusb_get_device_descriptor(devList[i], &desc);
for (const auto& supported : supportedPrinters_.models) {
if (desc.idVendor == supported.first && desc.idProduct == supported.second) {
numDevice = i;
break;
}
}
}
devicePtr_ =
libusb_open_device_with_vid_pid(contextPtr_, vendorModelId.first,
vendorModelId.second); // these are vendorID and productID
if (devicePtr_ == NULL) {
if (numDevice < 0) {
libusb_exit(contextPtr_);
return;
}
retValue = libusb_open(devList[numDevice], &devicePtr_); // these are vendorID and productID
if (retValue != 0) {
libusb_free_device_list(devList, 1);
libusb_exit(contextPtr_);
throw std::runtime_error("Cannot open printer device");
}
// ...
if (libusb_kernel_driver_active(devicePtr_, 0) == 1) { // find out if kernel driver is attached
std::cout << "Kernel Driver Active" << std::endl;
if (libusb_detach_kernel_driver(devicePtr_, 0) == 0) // detach it
std::cout << "Kernel Driver Detached!" << std::endl;
}
retValue = libusb_claim_interface(
devicePtr_, 0); // claim interface 0 (the first) of device (mine had jsut 1)
if (retValue < 0) {
std::cout << "Cannot Claim Interface" << std::endl;
throw std::runtime_error("Cannot claim interface");
}
libusb_free_device_list(devList, 1);
}
PosPrinter::~PosPrinter()
@ -40,15 +71,4 @@ PosPrinter::~PosPrinter()
libusb_close(devicePtr_); // close the device we opened
libusb_exit(contextPtr_); // close the session
delete instance_;
}
void PosPrinter::initialize(std::pair<int, int> vendorModelId)
{
if (!instance_) {
instance_ = new PosPrinter(vendorModelId);
}
}
PosPrinter* PosPrinter::getInstance() { return instance_; }