开发驱动时用到的内核打印函数KdPrint 的使用方法

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转载自: http://blog.csdn.net/wjcsharp/article/details/6161712

 

DbgPrint会发送一个消息给内核调试器

DbgPrint and DbgPrintEx can be called at IRQL<=DIRQL. However, Unicode format codes (%wc and %ws) can be used only at IRQL PASSIVE_LEVEL. Also, because the debugger uses interprocess interrupts (IPIs) to communicate with other processors, callingDbgPrint at IRQL>DIRQL can cause deadlocks.

能在内核模式下使用DbgPrint函数。如果想在用户模式下使用打印到windbg上查看,得用OutPutDebugString

In Windows Vista and later versions of Windows, DbgPrint sends a message only if certain conditions apply. Specifically, it behaves like theDbgPrintEx routine with the DEFAULT component and a message importance level of DPFLTR_INFO_LEVEL. In other words, the following two function calls are identical:

 

 

 

KdPrint使用方法类似printf,注意KdPrint((" ",  ));使用的是双括号。

用KdPrint(())来代替printf 输出信息。这些信息可以在DbgView 中看到。KdPrint(())自身是一个宏,
为了完整传入参数所以使用了两重括弧。这个比DbgPrint 调用要稍好。因为在free 版不被编译。

 

DebugPrint格式说明符

 二、

几天一直在做那些无聊的实验,把驱动的学习耽误到现在。幸好,把那些无聊的实验写完。

         话说回来,驱动编程真的比在RING3下麻烦很多呢,在字符串的使用都需要做很多的初始化,搞到我头都大了,如果是用C就很好理解,但是我用的是汇编~~~。今天,就看了看关于DbgPrint的用法,顺便做点笔记。

 

         DbgPrintf,是输出Debug信息的,用法跟printf,sprintf,wsprintf类似。

  ULONG                                      DbgPrint(                                        IN PCHAR  Format,                                        . . . .  [arguments]                                        );

   1、直接输出字符串,输出的字符串是以NULL结尾的字符串(CHAR类型),如:

    invoke DbgPrint,$CTA0("the Driver has loaded.")

2、指定格式输出字符串,输出得字符串可以是以NULL结尾的ASNI字符串,也可以是宽字符串(WCHAR类型),如:

   invoke DbgPrint,$CTA0("%s"),$CTA0("The Driver has Unloaded.")   ;输出ASNI字符串         invoke DbgPrint,$CTA0("%ws"),$CTW0("The Driver has Unloaded.")     ;输出wchar类型字符串         invoke DbgPrint,$CTA0("%S"),$CTW0("The Driver has Unloaded.")     ;输出wchar类型字符串(注意是大写的S) 

3、UNICODE_STRING结构的串的输出,如:

 ucstShow    UNICODE_STRING    <?>             ;定义一个UNICODE_STRING的结构         invoke RtlInitUnicodeString,addr ucstShow,$CTW0("This is the fifth debug Information.")     ;初始化         invoke DbgPrint,$CTA0("%wZ"),addr ucstShow

4、混合拼接信息输出,如:

invoke RtlInitUnicodeString,addr ucstShow,$CTW0("hello,I was born in")         invoke DbgPrint,$CTA0("%wZ %x"),addr ucstShow,dwShow

实际上就是printf,sprintf,wsprintf的用法,很简单~~

         还有很多输出方式,如下表(网上找的):

以下是随便写的测试代码:

;/**; *************************************************************************; * 文件名称: Driver.asm; * 版      本:; * 描      述: 学习DbgPrint的用法; * 作      者: zzydog; * 创建日期: 2010; *************************************************************************; */.386.model flat, stdcalloption casemap:noneinclude Strings.macinclude w2k\ntstatus.incinclude w2k\ntddk.incinclude w2k\ntoskrnl.incincludelib ntoskrnl.libincludelib ntdll.lib;************************************************************************************;函数定义DriverEntry proto pDriverObject:PDRIVER_OBJECT,pusRegistryPath:PUNICODE_STRING    DirverUnload proto pDriverObject:PDRIVER_OBJECT;************************************************************************************.data    ucstShow    UNICODE_STRING    <?>    szShowLoad        db            "The Dirver has been loaded!",NULL    szShowUnLoad    db            "The Driver has been Unloaded!",NULL    dwShow            dd            1990h.codeDriverEntry proc pDriverObject:PDRIVER_OBJECT,pusRegistryPath:PUNICODE_STRING    invoke DbgPrint,addr szShowLoad    invoke DbgPrint,$CTA0("This is the first debug Information.")    invoke DbgPrint,$CTA0("%s"),$CTA0("This is the second debug Information.")    invoke DbgPrint,$CTA0("%ws"),$CTW0("This is the third debug Information.")    invoke DbgPrint,$CTA0("%S"),$CTW0("This is the forth debug Information.")    invoke RtlInitUnicodeString,addr ucstShow,$CTW0("This is the fifth debug Information.")    invoke DbgPrint,$CTA0("%wZ"),addr ucstShow    invoke RtlInitUnicodeString,addr ucstShow,$CTW0("hello,I was born in")    invoke DbgPrint,$CTA0("%wZ %x"),addr ucstShow,dwShow    assume edx:ptr DRIVER_OBJECT    mov edx,[pDriverObject]    mov [edx].DriverUnload,offset DriverUnload    mov eax,STATUS_SUCCESS    retDriverEntry endpDriverUnload proc pDriverObject:PDRIVER_OBJECT    invoke DbgPrint,$CTA0("%s"),addr szShowUnLoad    mov eax,STATUS_SUCCESS    retDriverUnload endpend DriverEntry


 

 

 



 

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