在struct内创建struct [英] creating struct within struct

问题描述

我正在导入一个旧的C Windows驱动程序项目，在Visual c + + 6.0中创建到visual studio 2012中。结构的定义方式导致错误在vs2012。

  typedef struct {
 LINK Link; 
 HANDLE hFile; 
 BYTE handleType; 
 OVERLAPPED重叠; 
 CRITICAL_SECTION csIoCtrl; 
} USB_HANDLE，* PUSB_HANDLE; 
 
 typedef struct {
 USB_HANDLE; //错误发生在这里说没有声明为USB_HANDLE 
 LIST PipeList; 
 BOOL bRemoved; 
 CRITICAL_SECTION csPipeList; 
 SP_DEVICE_INTERFACE_DETAIL_DATA * InterfaceData; 
} USB_DEVICE; * PUSB_DEVICE; 
  

然后，项目使用调用
USB_DEVICE mydevice;这个类型的结构可能在vs2012？

mydevice-> hfile = handle;

< （编辑 - 虽然这些显示为错误，visual studio 2012编译并成功地构建了一个解决方案。我将测试驱动程序，看看一切是否正常工作很快。）

错误：

我认为我可以使用的工作是制作USB_DEVICE结构：

  typedef struct {
 USB_HANDLE USB_HANDLE; 
 LIST PipeList; 
 BOOL bRemoved; 
 CRITICAL_SECTION csPipeList; 
 SP_DEVICE_INTERFACE_DETAIL_DATA * InterfaceData; 
} USB_DEVICE，* PUSB_DEVICE;然后我可以进行其余的调用：
 mydevice-> USB_HANDLE.hfile = 
  

<

这是一个等价的语句吗？

解决方案

宏声明 USB_HANDLE ，然后在两者中使用它。喜欢，

  #define HANDLE_BODY \ 
 LINK链接; \ 
 HANDLE hFile; \ 
 BYTE handleType; \ 
 OVERLAPPED重叠; \ 
 CRITICAL_SECTION csIoCtrl; 
 
 typedef struct {
 HANDLE_BODY 
} USB_HANDLE，* PUSB_HANDLE; 
 
 typedef struct {
 HANDLE_BODY 
 LIST PipeList; 
 BOOL bRemoved; 
 CRITICAL_SECTION csPipeList; 
 SP_DEVICE_INTERFACE_DETAIL_DATA * InterfaceData; 
} USB_DEVICE，* PUSB_DEVICE; 
  

如果您也可以创建联合需要。否则，您可能需要一些特殊的非标准编译器选项。例如，许多编译器支持 transparent_union ，这也会解决你的问题。但是，我不认为Visual C ++支持这一点。但也许有些人更了解这些产品可以帮助。

I'm working on importing an old C windows driver project that was created in Visual c++ 6.0 into visual studio 2012. The way that the structs were defined are causing errors in vs2012.

typedef struct {
    LINK               Link;
    HANDLE             hFile;
    BYTE               handleType;
    OVERLAPPED         Overlapped;
    CRITICAL_SECTION   csIoCtrl;
} USB_HANDLE, *PUSB_HANDLE;

typedef struct {
    USB_HANDLE;        //error occurs here saying nothing was declared for USB_HANDLE
    LIST               PipeList;
    BOOL               bRemoved;
    CRITICAL_SECTION   csPipeList;
    SP_DEVICE_INTERFACE_DETAIL_DATA *InterfaceData;
} USB_DEVICE, *PUSB_DEVICE;

The project then uses calls like USB_DEVICE mydevice; mydevice->hfile = handle;

Is this type of structure possible in vs2012?

(edit - though these do show as errors, visual studio 2012 did compile and successfully build a solution. I will be testing the driver to see if everything works properly soon.)

Errors:

A work around that I thought I could use was making the USB_DEVICE struct:

typedef struct {
    USB_HANDLE         USB_HANDLE;        
    LIST               PipeList;
    BOOL               bRemoved;
    CRITICAL_SECTION   csPipeList;
    SP_DEVICE_INTERFACE_DETAIL_DATA *InterfaceData;
} USB_DEVICE, *PUSB_DEVICE;

Then I could make the rest of the calls: mydevice->USB_HANDLE.hfile = handle;

Is this an equivalent statement?

解决方案

Define a macro to declare the USB_HANDLE and then use it in both. Like,

#define HANDLE_BODY                \
   LINK               Link;        \
   HANDLE             hFile;       \
   BYTE               handleType;  \
   OVERLAPPED         Overlapped;  \
   CRITICAL_SECTION   csIoCtrl;

typedef struct {
   HANDLE_BODY
} USB_HANDLE, *PUSB_HANDLE;

typedef struct {
    HANDLE_BODY
    LIST               PipeList;
    BOOL               bRemoved;
    CRITICAL_SECTION   csPipeList;
    SP_DEVICE_INTERFACE_DETAIL_DATA *InterfaceData;
} USB_DEVICE, *PUSB_DEVICE;

You can create a union if you also need that. Otherwise, you may need some special non-standard compiler options. For instance, many compiler support transparent_union, which would also solve your issue. However, I don't think Visual C++ supports this. But maybe someone more knowledgeable of these products can help.

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