◎J！－－这样实现动态数组？？？？

  看了一个极为诡异的USB驱动例子
例子的用意是利用deviceExtention来保存USB设备的configuration描述符由于事先不可能知道有多少个configuration描述符，例子想用所谓的动态数组吧（i guess)：

   typedef struct _DEVICE_EXTENSION{
???
PUSB_DEVICE_DESCRIPTOR DeviceDescriptor;
// keep an array of pointers to the configuration descriptor
PUSB_CONFIGURATION_DESCRIPTOR * ConfigurationDescriptors;
???
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

然后这样使用它来保存取到的configuration descriptor,对吗

???
for (i = 0; i < deviceExtension->DeviceDescriptor->bNumConfigurations; i++)
{
// Get the configuration descriptor (first 9 bytes)
UCHAR tempBuffer[9];
descriptorBuffer = &tempBuffer;
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
siz);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
// Now get the rest of the configuration descriptor & save
siz = ((PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer)->wTotalLength;
descriptorBuffer = ExAllocatePool(NonPagedPool, siz);
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
siz);
if (!NT_SUCCESS(ntStatus))
{
goto StartDeviceEnd;
}
deviceExtension->ConfigurationDescriptors =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;
} // get all configuration descriptors

问题是：deviceExtension->ConfigurationDescriptors =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;可以实现动态数组吗？

如何理解，请大虾不吝赐教

看了一个极为诡异的USB驱动例子
例子的用意是利用deviceExtention来保存USB设备的configuration描述符由于事先不可能知道有多少个configuration描述符，例子想用所谓的动态数组吧（i guess)：

typedef struct _DEVICE_EXTENSION{
???
PUSB_DEVICE_DESCRIPTOR DeviceDescriptor;
PUSB_CONFIGURATION_DESCRIPTOR * ConfigurationDescriptors;
???
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

然后这样使用它来保存取到的configuration descriptor,对吗

???
for (i = 0; i < deviceExtension->DeviceDescriptor->bNumConfigurations; i++)
{
// Get the configuration descriptor (first 9 bytes)
UCHAR tempBuffer[9];
descriptorBuffer = &tempBuffer;
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
// Now get the rest of the configuration descriptor & save
size = ((PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer)->wTotalLength;
descriptorBuffer = ExAllocatePool(NonPagedPool, size);
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
deviceExtension->ConfigurationDescriptors =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;
} // get all configuration descriptors

问题是：deviceExtension->ConfigurationDescriptors =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;可以实现动态数组吗？

如何理解，请大虾不吝赐教

上面有错，这样好看一些

ft,还是有错！原文里的【i】变成斜体字啦！～

看了一个极为诡异的USB驱动例子
例子的用意是利用deviceExtention来保存USB设备的configuration描述符由于事先不可能知道有多少个configuration描述符，例子想用所谓的动态数组吧（i guess)：

typedef struct _DEVICE_EXTENSION{
???
PUSB_DEVICE_DESCRIPTOR DeviceDescriptor;
PUSB_CONFIGURATION_DESCRIPTOR * ConfigurationDescriptors;
???
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

然后这样使用它来保存取到的configuration descriptor,对吗

???
for (i = 0; i < deviceExtension->DeviceDescriptor->bNumConfigurations; i++)
{
// Get the configuration descriptor (first 9 bytes)
UCHAR tempBuffer[9];
descriptorBuffer = &tempBuffer;
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
// Now get the rest of the configuration descriptor & save
size = ((PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer)->wTotalLength;
descriptorBuffer = ExAllocatePool(NonPagedPool, size);
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
deviceExtension->ConfigurationDescriptors【i】 =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;
} // get all configuration descriptors

问题是：deviceExtension->ConfigurationDescriptors【i】 =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;可以实现动态数组吗？

如何理解，请大虾不吝赐教

上面有错，这样好看一些

 :cool: :cool: :cool: :cool: :cool: :cool:
呵呵，漏了这样的声明：
deviceExtension->ConfigurationDescriptors = ExAllocatePool(NonPagedPool,
deviceExtension->DeviceDescriptor->bNumConfigurations *
sizeof(PUSB_CONFIGURATION_DESCRIPTOR));
这样才对嘛！

取消这个问题啦！～

:cool: :cool: :cool: :cool: :cool: :cool:
呵呵，漏了这样的声明：
deviceExtension->ConfigurationDescriptors = ExAllocatePool(NonPagedPool,
deviceExtension->DeviceDescriptor->bNumConfigurations *
sizeof(PUSB_CONFIGURATION_DESCRIPTOR));
这样才对嘛！

取消这个问题啦！～
 

放分庆祝吧

 :D :D :D :D :D :D
呵呵这个和尚到处化缘了啦!~（分不在多，心诚则零，emituofu!）