C++ 带有地址的奇怪bug
我有几个问题要解决,请帮忙 我的第一个问题是表达式必须是指向完整对象类型的指针,但我通过在变量前添加&解决了这个问题,我做得对吗 下面的代码片段C++ 带有地址的奇怪bug,c++,c,windows,C++,C,Windows,我有几个问题要解决,请帮忙 我的第一个问题是表达式必须是指向完整对象类型的指针,但我通过在变量前添加&解决了这个问题,我做得对吗 下面的代码片段 LPVOID dll; PIMAGE_DOS_HEADER dos; dll = LoadLibraryA(a[1]); dos = (PIMAGE_DOS_HEADER)dll; nt = (PIMAGE_NT_HEADERS)(&dll+dos->e_lfanew); #include&
LPVOID dll;
PIMAGE_DOS_HEADER dos;
dll = LoadLibraryA(a[1]);
dos = (PIMAGE_DOS_HEADER)dll;
nt = (PIMAGE_NT_HEADERS)(&dll+dos->e_lfanew);
#include<stdio.h>
#include<windows.h>
#include<winternl.h>
int main(int i, char* a[]) {
LPVOID dll, faddr;
PIMAGE_DOS_HEADER dos;
PIMAGE_NT_HEADERS nt;
PIMAGE_EXPORT_DIRECTORY exp;
PWORD f_addr_list, f_name_list;
PWORD f_ord_list;
DWORD rva;
LPSTR fname;
if (i != 2) {
printf("error");
return 0;
}
dll = LoadLibraryA(a[1]);
if (dll == NULL) {
printf("failed to load");
return 0;
}
dos = (PIMAGE_DOS_HEADER)dll;
nt = (PIMAGE_NT_HEADERS)(dll+dos->e_lfanew);
exp = (PIMAGE_EXPORT_DIRECTORY)(&dll + nt->OptionalHeader.DataDirectory[0].VirtualAddress);
f_addr_list = (PDWORD)(&dll + exp->AddressOfFunctions);
f_name_list = (PDWORD)(&dll + exp->AddressOfNames);
f_ord_list = (PWORD)(&dll + exp->AddressOfNameOrdinals);
printf("Total function names: %ld\nTotal Function: %ld\n", exp->NumberOfNames, exp->NumberOfFunctions);
printf("Address\t\t\t\t\Function Name\n");
printf("-------\t\t\t\t\t----------\n");
for (i = 0; i < exp->NumberOfNames; i++)
{
fname = (LPSTR)dll + f_name_list[i];
rva = f_ord_list[i];
faddr = &dll + f_addr_list[rva];
printf("%p\t\t\t\t%s\n", faddr, fname);
}
FreeLibrary(dll);
return 0;
}
下一个问题是我的程序输出总是不同的,为什么?
我的程序应该显示所有地址和函数名,代码如下
LPVOID dll;
PIMAGE_DOS_HEADER dos;
dll = LoadLibraryA(a[1]);
dos = (PIMAGE_DOS_HEADER)dll;
nt = (PIMAGE_NT_HEADERS)(&dll+dos->e_lfanew);
#include<stdio.h>
#include<windows.h>
#include<winternl.h>
int main(int i, char* a[]) {
LPVOID dll, faddr;
PIMAGE_DOS_HEADER dos;
PIMAGE_NT_HEADERS nt;
PIMAGE_EXPORT_DIRECTORY exp;
PWORD f_addr_list, f_name_list;
PWORD f_ord_list;
DWORD rva;
LPSTR fname;
if (i != 2) {
printf("error");
return 0;
}
dll = LoadLibraryA(a[1]);
if (dll == NULL) {
printf("failed to load");
return 0;
}
dos = (PIMAGE_DOS_HEADER)dll;
nt = (PIMAGE_NT_HEADERS)(dll+dos->e_lfanew);
exp = (PIMAGE_EXPORT_DIRECTORY)(&dll + nt->OptionalHeader.DataDirectory[0].VirtualAddress);
f_addr_list = (PDWORD)(&dll + exp->AddressOfFunctions);
f_name_list = (PDWORD)(&dll + exp->AddressOfNames);
f_ord_list = (PWORD)(&dll + exp->AddressOfNameOrdinals);
printf("Total function names: %ld\nTotal Function: %ld\n", exp->NumberOfNames, exp->NumberOfFunctions);
printf("Address\t\t\t\t\Function Name\n");
printf("-------\t\t\t\t\t----------\n");
for (i = 0; i < exp->NumberOfNames; i++)
{
fname = (LPSTR)dll + f_name_list[i];
rva = f_ord_list[i];
faddr = &dll + f_addr_list[rva];
printf("%p\t\t\t\t%s\n", faddr, fname);
}
FreeLibrary(dll);
return 0;
}
有什么问题吗?在WIN OS下,模块句柄是加载到内存中的库的基址 在地址之前添加
和并不能解决问题
,但会创建一个更大的问题,添加一个导致内存冲突的间接寻址(现在使用变量dll
的地址作为模块基地址)
不能对空指针进行数学计算,因为void
没有阻止正确位移计算的大小。将基指针设为字节
指针,而将基指针的大小设为1
您尝试执行的工作代码是:
#include<stdio.h>
#include<windows.h>
#include<winternl.h>
int main(int i, char *a[])
{
LPVOID faddr;
BYTE *dll;
PIMAGE_DOS_HEADER dos;
PIMAGE_NT_HEADERS nt;
PIMAGE_EXPORT_DIRECTORY exp;
PDWORD f_addr_list, f_name_list;
PWORD f_ord_list;
DWORD rva;
LPSTR fname;
if (i != 2)
{
printf("error\n");
return 0;
}
dll = (BYTE *)LoadLibraryA(a[1]);
if (dll == NULL)
{
printf("failed to load\n");
return 0;
}
dos = (PIMAGE_DOS_HEADER)dll;
nt = (PIMAGE_NT_HEADERS) (dll + dos->e_lfanew);
exp = (PIMAGE_EXPORT_DIRECTORY) (dll + nt->OptionalHeader.DataDirectory[0].VirtualAddress);
f_addr_list = (PDWORD) (dll + exp->AddressOfFunctions);
f_name_list = (PDWORD) (dll + exp->AddressOfNames);
f_ord_list = (PWORD) (dll + exp->AddressOfNameOrdinals);
printf("Total function names: %ld\nTotal Function: %ld\n", exp->NumberOfNames, exp->NumberOfFunctions);
printf("Address\t\t\t\tFunction Name\n");
printf("-------\t\t\t\t\t----------\n");
for (i = 0; i < exp->NumberOfNames; i++)
{
fname = (LPSTR)(dll + f_name_list[i]);
rva = f_ord_list[i];
faddr = dll + f_addr_list[rva];
printf("%p\t\t\t\t%s\n", faddr, fname);
}
FreeLibrary((LPVOID)dll);
return 0;
}
#包括
#包括
#包括
int main(int i,char*a[]
{
LPVOID-faddr;
字节*dll;
PIMAGE_DOS_HEADER DOS;
PIMAGE\u NT\u头;
PIMAGE_导出_目录exp;
PDWORD地址列表、名称列表;
PWORD f_ord_清单;
德沃德rva;
LPSTR-fname;
如果(i!=2)
{
printf(“错误\n”);
返回0;
}
dll=(字节*)加载库a(a[1]);
如果(dll==NULL)
{
printf(“加载失败\n”);
返回0;
}
dos=(PIMAGE\U dos\U头)dll;
nt=(PIMAGE\u nt\u头)(dll+dos->e\u lfanew);
exp=(PIMAGE\u EXPORT\u目录)(dll+nt->OptionalHeader.DataDirectory[0].VirtualAddress);
f_addr_list=(PDWORD)(dll+exp->addressofffunctions);
f_name_list=(PDWORD)(dll+exp->AddressOfNames);
f_ord_list=(PWORD)(dll+exp->AddressOfNameOrdinals);
printf(“总函数名:%ld\n总函数:%ld\n”,exp->NumberOfNames,exp->NumberOfFunctions);
printf(“地址\t\t\t\t函数名\n”);
printf(“----\t\t\t\t\t----\n”);
对于(i=0;iNumberOfNames;i++)
{
fname=(LPSTR)(dll+f_name_list[i]);
rva=f_ord_list[i];
faddr=dll+f_地址列表[rva];
printf(“%p\t\t\t\t%s\n”,faddr,fname);
}
FreeLibrary((LPVOID)dll);
返回0;
}
&dll+dos->e\u lfanew
导致未定义的行为。一般来说,“尝试直到错误消失”不是一个好方法,在CAlso程序请不要双重标签;根据你使用的编译器选择C或C++