C++:验证 Windows 应用程序是否打开? [英] C++: Verify a Windows application is open?

问题描述

我有一个 C++ 程序，它涉及打开一个应用程序(比如calculator.exe).我需要能够进行测试以确保此应用程序已打开.这是我的意思的一个例子.

I have a C++ program that involves opening an application (let's say calculator.exe). I need to be able to test to make sure this application is open. Here's an example of what I mean.

    #include <iostream.h>

    int main()
    {
        system("start calculator");
        if (something)
            cout << "Calculator is running.\n";

        cin.get();
        return 0;
    }

我需要为 something 输入什么来测试计算器是否打开?

What would I need to put in for something that tests whether the calculator is open?

推荐答案

可以通过进程名查找，也可以通过窗口标题查找.

You can find it by process name, or you can find it by window title.

#include <iostream>
#include <windows.h>
#include <TlHelp32.h>

DWORD find_by_process_name(const wchar_t* process_name)
{
    DWORD pid = 0;
    HANDLE hndl = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS | TH32CS_SNAPMODULE, 0);
    if (hndl)
    {
        PROCESSENTRY32  process = { sizeof(PROCESSENTRY32) };
        Process32First(hndl, &process);
        do
        {
            if (_wcsicmp(process.szExeFile, process_name) == 0)
            {
                pid = process.th32ProcessID;
                break;
            }
        } while (Process32Next(hndl, &process));

        CloseHandle(hndl);
    }

    return pid;
}

int main()
{
    ShellExecuteA(0, "open", "calc.exe", 0, 0, SW_SHOWNORMAL);
    if (find_by_process_name(L"calc.exe"))
        std::cout << "calculator is running\n";
    return 0;
}

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