本文整理汇总了C++中EFI_USB_IO_PROTOCOL::UsbGetStringDescriptor方法的典型用法代码示例。如果您正苦于以下问题：C++ EFI_USB_IO_PROTOCOL::UsbGetStringDescriptor方法的具体用法？C++ EFI_USB_IO_PROTOCOL::UsbGetStringDescriptor怎么用？C++ EFI_USB_IO_PROTOCOL::UsbGetStringDescriptor使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类EFI_USB_IO_PROTOCOL的用法示例。
在下文中一共展示了EFI_USB_IO_PROTOCOL::UsbGetStringDescriptor方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: StrSize
/**
Try to get the controller's USB description.
@param Handle Controller handle.
@return The description string.
**/
CHAR16 *
BmGetUsbDescription (
IN EFI_HANDLE Handle
)
{
EFI_STATUS Status;
EFI_USB_IO_PROTOCOL *UsbIo;
CHAR16 NullChar;
CHAR16 *Manufacturer;
CHAR16 *Product;
CHAR16 *SerialNumber;
CHAR16 *Description;
EFI_USB_DEVICE_DESCRIPTOR DevDesc;
UINTN DescMaxSize;
Status = gBS->HandleProtocol (
Handle,
&gEfiUsbIoProtocolGuid,
(VOID **) &UsbIo
);
if (EFI_ERROR (Status)) {
return NULL;
}
NullChar = L'\0';
Status = UsbIo->UsbGetDeviceDescriptor (UsbIo, &DevDesc);
if (EFI_ERROR (Status)) {
return NULL;
}
Status = UsbIo->UsbGetStringDescriptor (
UsbIo,
mBmUsbLangId,
DevDesc.StrManufacturer,
&Manufacturer
);
if (EFI_ERROR (Status)) {
Manufacturer = &NullChar;
}
Status = UsbIo->UsbGetStringDescriptor (
UsbIo,
mBmUsbLangId,
DevDesc.StrProduct,
&Product
);
if (EFI_ERROR (Status)) {
Product = &NullChar;
}
Status = UsbIo->UsbGetStringDescriptor (
UsbIo,
mBmUsbLangId,
DevDesc.StrSerialNumber,
&SerialNumber
);
if (EFI_ERROR (Status)) {
SerialNumber = &NullChar;
}
if ((Manufacturer == &NullChar) &&
(Product == &NullChar) &&
(SerialNumber == &NullChar)
) {
return NULL;
}
DescMaxSize = StrSize (Manufacturer) + StrSize (Product) + StrSize (SerialNumber);
Description = AllocateZeroPool (DescMaxSize);
ASSERT (Description != NULL);
StrCatS (Description, DescMaxSize/sizeof(CHAR16), Manufacturer);
StrCatS (Description, DescMaxSize/sizeof(CHAR16), L" ");
StrCatS (Description, DescMaxSize/sizeof(CHAR16), Product);
StrCatS (Description, DescMaxSize/sizeof(CHAR16), L" ");
StrCatS (Description, DescMaxSize/sizeof(CHAR16), SerialNumber);
if (Manufacturer != &NullChar) {
FreePool (Manufacturer);
}
if (Product != &NullChar) {
FreePool (Product);
}
if (SerialNumber != &NullChar) {
FreePool (SerialNumber);
}
BmEliminateExtraSpaces (Description);
return Description;
}