C++ -- FindWindow win32 API 总是失败!
我在 C++ 中使用 FindWindow() 函数时遇到问题。我正在使用两个程序——程序 A 和程序 B。两者都是本机代码中的控制台应用程序。 程序 A 用值初始化 int i 和 string s。程序 B 使用程序 A 运行时显示的地址从程序 A 的内存中读取它们。 目前我只对读取“i”的值感兴趣。
我无法让 FindWindow() 工作,但我不知道为什么:/我没有做过太多 win32 api 编程,所以我在这个隔间中很新。
计划 A:
#include <Windows.h>
#include <string>
#include <iostream>
using namespace std;
int main() {
SetConsoleTitle(L"PROGRAM_A");
string s = "Kuken\0";
int i = 12345;
char choice;
int* ptr_i = &i;
string* ptr_s = &s;
cout << "ADDRESSES: \n";
cout << "Int i: " << ptr_i << "\n";
cout << "String s: " << ptr_s << "\n\n";
cout << "INITIAL VALUES: \n";
cout << "Int i: " << i << "\n";
cout << "String s: " << s << "\n\n";
cout << "***Read/Modify this process memory with programB and view new values! \n\n";
while (true) {
cout << "Print values of i and s? y/n \n";
cin >> choice;
switch (choice) {
case 'y':
cout << "i: " << *ptr_i << "\n";
cout << "s: " << *ptr_s << "\n";
break;
default:
break;
}
}
return 0;
}
计划 B:
#include <Windows.h>
#include <iostream>
#include <string>
int main() {
HWND handle_temp;
unsigned long pid;
int buffer[1];
std::wstring name = L"PROGRAM_A";
int temp;
int* ptr_i;
std::string* ptr_s;
std::cout << "Type the address of i in programA: ";
std::cin >> std::hex >> temp;
std::cout << "\n";
ptr_i = (int*)temp;
std::cout << "Type the address of s in programA: ";
std::cin >> std::hex >> temp;
std::cout << "\n\n";
ptr_s = (std::string*)temp;
handle_temp = FindWindow(NULL,name.c_str());
if (!FindWindow(NULL,name.c_str())) {
std::cout << "Error: Did not find window \n";
std::cout << "src: " << ptr_i << "\n";
}
GetWindowThreadProcessId(handle_temp,&pid);
HANDLE handle_prgmA = OpenProcess(PROCESS_VM_READ,0,pid);
if (ReadProcessMemory(handle_prgmA,ptr_i,&buffer,4,NULL)) {
std::cout << buffer[0];
}
else {
std::cout << "Could not read memory";
}
CloseHandle(handle_prgmA);
while (true) {
std::cin >> temp;
}
}
I am having problem with FindWindow() function in C++. I am using two programs -- Program A and program B. Both are console-applicaitons in native code.
Program A initialises int i and string s with values. Program B reads them from Program A's memory using addresses shown when program A runs.
Currently I am only interested in reading the value of 'i'.
I cannot get the FindWindow() to work though and I do not know why :/ I havn't done much win32 api programming so I' pretty new in this compartment.
PROGRAM A:
#include <Windows.h>
#include <string>
#include <iostream>
using namespace std;
int main() {
SetConsoleTitle(L"PROGRAM_A");
string s = "Kuken\0";
int i = 12345;
char choice;
int* ptr_i = &i;
string* ptr_s = &s;
cout << "ADDRESSES: \n";
cout << "Int i: " << ptr_i << "\n";
cout << "String s: " << ptr_s << "\n\n";
cout << "INITIAL VALUES: \n";
cout << "Int i: " << i << "\n";
cout << "String s: " << s << "\n\n";
cout << "***Read/Modify this process memory with programB and view new values! \n\n";
while (true) {
cout << "Print values of i and s? y/n \n";
cin >> choice;
switch (choice) {
case 'y':
cout << "i: " << *ptr_i << "\n";
cout << "s: " << *ptr_s << "\n";
break;
default:
break;
}
}
return 0;
}
PROGRAM B:
#include <Windows.h>
#include <iostream>
#include <string>
int main() {
HWND handle_temp;
unsigned long pid;
int buffer[1];
std::wstring name = L"PROGRAM_A";
int temp;
int* ptr_i;
std::string* ptr_s;
std::cout << "Type the address of i in programA: ";
std::cin >> std::hex >> temp;
std::cout << "\n";
ptr_i = (int*)temp;
std::cout << "Type the address of s in programA: ";
std::cin >> std::hex >> temp;
std::cout << "\n\n";
ptr_s = (std::string*)temp;
handle_temp = FindWindow(NULL,name.c_str());
if (!FindWindow(NULL,name.c_str())) {
std::cout << "Error: Did not find window \n";
std::cout << "src: " << ptr_i << "\n";
}
GetWindowThreadProcessId(handle_temp,&pid);
HANDLE handle_prgmA = OpenProcess(PROCESS_VM_READ,0,pid);
if (ReadProcessMemory(handle_prgmA,ptr_i,&buffer,4,NULL)) {
std::cout << buffer[0];
}
else {
std::cout << "Could not read memory";
}
CloseHandle(handle_prgmA);
while (true) {
std::cin >> temp;
}
}
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这根本无法按照您希望的方式工作。即使 FindWindow 调用成功:该窗口不是由您的控制台程序创建的。相反,Windows 有一个单独的服务器进程负责控制台窗口的创建,以便多个进程可以共享一个控制台窗口。
相反,我建议您允许直接输入进程 ID,例如从程序管理器获取进程 ID 后。如果您确实想通过窗口标题查找进程,则需要使用 CreateWindow。
编辑:您可以使用EnumProcesses 在所有进程列表中查找您的进程。
This cannot work at all the way you want it to work. Even if the FindWindow call would succeed: the window is not created by your console program. Instead, Windows has a separate server process taking care of console window creation, so that multiple processes can share a single console window.
Instead, I recommend that you allow direct entering of the process ID, e.g. after obtaining it from the program manager. If you really want to find a process by window title, you need to use CreateWindow in process A.
Edit: You can use EnumProcesses to find your process in the list of all processes.
IIRC,FindWindow 需要消息循环才能运行。
由于控制台窗口没有您控制的消息循环,因此它不起作用。
IIRC, FindWindow requires a message loop to function.
Since console windows don't have a message loop that you control, it does not work.