一份很简单的代码，就是用Dbgprint输出一些信息。
代码写成这样可以编译通过

#include <ntddk.h>


NTKERNELAPI
NTSTATUS
PsLookupProcessByProcessId (
    IN PVOID        ProcessId,
    OUT PEPROCESS   *Process
);

NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
{    
	DbgPrint("Drv Loading!\n");
	//NTSTATUS st;
	//PEPROCESS eprocess;
	//UNICODE_STRING spath;
	return STATUS_SUCCESS;
}

但是如果把NTSTATUS st这一行的注释符去掉，就会报错。
错误信息是这样的
c:\DDK\test\Test.c(18) : error C2275: 'NTSTATUS' : illegal use of this type as an expression
        c:\DDK\inc\wxp\ntdef.h(560) : see declaration of 'NTSTATUS'
c:\DDK\test\Test.c(18) : error C2146: syntax error : missing ';' before identifier 'st'
c:\DDK\test\Test.c(18) : error C2144: syntax error : '<Unknown>' should be preceded by '<Unknown>'
c:\DDK\test\Test.c(18) : error C2144: syntax error : '<Unknown>' should be preceded by '<Unknown>'
c:\DDK\test\Test.c(18) : error C2143: syntax error : missing ';' before 'identifier'
c:\DDK\test\Test.c(18) : error C2065: 'st' : undeclared identifier

如果把UNICODE_STRING spath;这一行的注释符也去掉的话，错误又变成了
c:\DDK\test\Test.c(17) : error C2275: 'UNICODE_STRING' : illegal use of this type as an expression
        c:\DDK\inc\wxp\ntdef.h(1095) : see declaration of 'UNICODE_STRING'
c:\DDK\test\Test.c(17) : error C2146: syntax error : missing ';' before identifier 'spath'
c:\DDK\test\Test.c(17) : error C2144: syntax error : '<Unknown>' should be preceded by '<Unknown>'
c:\DDK\test\Test.c(17) : error C2144: syntax error : '<Unknown>' should be preceded by '<Unknown>'
c:\DDK\test\Test.c(17) : error C2143: syntax error : missing ';' before 'identifier'
c:\DDK\test\Test.c(17) : error C2065: 'spath' : undeclared identifier

拜托各位帮忙帮忙，我都快要崩溃了......
谢谢！

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