[转载]C/C++ 遍历窗口标题类名

原地址：https://cloud.tencent.com/developer/article/2201930

遍历每个进程，一次查找进程下的窗口，找到窗口标题为 “” ，窗口类名为 “RunDll” 的窗口。如果找到返回 true ，没找到返回 false。

#pragma region 依赖

typedef struct EnumHWndsArg{
    std::vector<HWND> *vecHWnds;
    DWORD dwProcessId;
}EnumHWndsArg, *LPEnumHWndsArg;

// 判断窗口是否属于目标进程
BOOL CALLBACK lpEnumFunc(HWND hwnd, LPARAM lParam){
    EnumHWndsArg *pArg = (LPEnumHWndsArg)lParam;
    DWORD  processId;

    // 检索窗口线程标识符
    GetWindowThreadProcessId(
        hwnd,            // 窗口句柄
        &processId        // 接收 PID 的指针
        );

    // 如果这个 HWND 属于这个 PID ，则加入到 vecHWnds 数组末尾
    if (processId == pArg->dwProcessId){pArg->vecHWnds->push_back(hwnd);}

    return TRUE;
}

// 根据 PID 获取 HWND
void GetHWndsByProcessID(DWORD processID, std::vector<HWND> &vecHWnds){
    EnumHWndsArg wi;
    wi.dwProcessId = processID;
    wi.vecHWnds = &vecHWnds;

    // 枚举所有顶级窗口
    EnumWindows(
        lpEnumFunc,        // 回调函数指针
        (LPARAM)&wi        // 传递给回调函数的值
        );
}

#pragma endregion

bool CSOL_dh()
{
    HANDLE hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
    PROCESSENTRY32 process = {sizeof(PROCESSENTRY32)};
    
    // 遍历进程
    while (Process32Next(hProcessSnap,&process)){
        string processName = process.szExeFile;        // 进程名
        std::vector<HWND> vecHWnds;                    // 进程下的窗体句柄数组
        GetHWndsByProcessID(process.th32ProcessID,vecHWnds);
        
        // 获取 HWND 窗口标题、窗口类名
        TCHAR szBuf_title[MAX_PATH];
        TCHAR szBuf_class[MAX_PATH];
        for (const HWND &h : vecHWnds){
            GetWindowText(
            h,                    // 窗口句柄
            szBuf_title,        // 接收窗口标题的缓冲区指针
            MAX_PATH            // 缓冲区字节大小
            );
            GetClassName(
            h,                    // 窗口句柄
            szBuf_class,        // 接收窗口类名的缓冲区指针
            MAX_PATH            // 缓冲区字节大小
            );

            // 判断是否有符合要求的窗体
            if(strcmp(szBuf_title,"") == 0 && strcmp(szBuf_class,"RunDLL") == 0){
                return true;
            }
            
            // 输出结果    
            //cout << "szBuf_title = " << szBuf_title << endl;
            //cout << "szBuf_class = " << szBuf_class << endl;
            //cout << "--------------------------------------------" << endl;
        }

    }
    
    return false;
}

API——获取鼠标位置的窗口句柄

#include <Windows.h>

#define MAX_TEXT_LEN 255

BOOL CALLBACK EnumChildProcess(HWND hwnd, LPARAM lParam)
{
    if (hwnd == NULL) {
        return FALSE;
    }
    BOOL ret;
    RECT rect;
    ret = GetWindowRect(hwnd, &rect);
    if (!ret) {
        printf("GetWindowRect hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
    }
    else {
        //printf("GetWindowRect hwnd = %p -> rect=(left=%ld, top=%ld, right=%ld, bottom=%ld)\n", hwnd, rect.left, rect.top, rect.right, rect.bottom);
        ret = PtInRect(&rect, *(POINT *)lParam);
        if (ret) {
            printf("GetWindowRect hwnd = %p -> rect=(left=%ld, top=%ld, right=%ld, bottom=%ld)\n", hwnd, rect.left, rect.top, rect.right, rect.bottom);
            //printf("PtInRect\n");

            /*
            WINUSERAPI int WINAPI GetWindowText(
            _In_ HWND hWnd,
            _Out_writes_(nMaxCount) LPTSTR lpString,    //可能是标题名或者file:///打头的文件完整路径
            _In_ int nMaxCount
            );
            如果函数成功，返回值是拷贝的字符串的字符个数，不包括中断的空字符；如果窗口无标题栏或文本，或标题栏为空，或窗口或控制的句柄无效，则返回值为零。若想获得更多错误信息，请调用GetLastError函数。
            */
            TCHAR windowText[MAX_TEXT_LEN];
            int lenRet = GetWindowText(hwnd, windowText, MAX_TEXT_LEN);
            if (lenRet == 0 && GetLastError() != 0) {
                //GetLastError()〖0〗-操作成功完成
                printf("GetWindowText hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
            }
            else {
                _tprintf(_T("GetWindowText hwnd=%p -> windowText=%s, lenRet=%d\n"), hwnd, windowText, lenRet);
            }

            /*
            WINUSERAPI int WINAPI GetClassNameW(
                _In_ HWND hWnd,
                _Out_writes_to_(nMaxCount, return) LPWSTR lpClassName,
                _In_ int nMaxCount
            );

            如果函数成功，返回值为拷贝到指定缓冲区的字符个数：如果函数失败，返回值为0。若想获得更多错误信息，请调用GetLastError函数。
            */
            TCHAR className[MAX_TEXT_LEN];
            lenRet = GetClassName(hwnd, className, MAX_TEXT_LEN);
            if (lenRet == 0) {
                printf("GetClassName hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
            }
            else {
                _tprintf(_T("GetClassName hwnd=%p -> className=%s, lenRet=%d\n"), hwnd, className, lenRet);
            }

            /*
            找出某个窗口的创建者（线程或进程），返回创建者的标志符
            哪个线程创建了这个窗口,返回的就是这个线程的id号 （进程只有一个线程的话，那么线程标志符与进程标志符就是指同一个标志符）
            WINUSERAPI DWORD WINAPI GetWindowThreadProcessId(
                _In_ HWND hWnd,
                _Out_opt_ LPDWORD lpdwProcessId //进程号的存放地址（变量地址）
            );
            返回线程号
            */
            DWORD dwProcessId;
            DWORD dwThreadId = GetWindowThreadProcessId(hwnd, &dwProcessId);
            printf("GetWindowThreadProcessId hwnd=%p -> processId=%ld, threadId=%ld\n", hwnd, dwProcessId, dwThreadId);

            /*
            WINUSERAPI UINT WINAPI GetWindowModuleFileName(
                _In_ HWND hwnd,
                _Out_writes_to_(cchFileNameMax, return) LPTSTR pszFileName, //模块完整路径
                _In_ UINT cchFileNameMax
            );
            返回值是复制到缓冲区的字符总数。
            */
            TCHAR fileName[MAX_PATH];
            lenRet = GetWindowModuleFileName(hwnd, fileName, MAX_PATH);
            if (lenRet == 0) {
                //错误码〖126〗-找不到指定的模块。
                printf("GetWindowModuleFileName hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
            } else {
                _tprintf(_T("GetWindowModuleFileName hwnd=%p -> fileName=%s\n"), hwnd, fileName);
            }

            /*
            WINUSERAPI BOOL WINAPI GetWindowInfo(
                _In_ HWND hwnd,
                _Inout_ PWINDOWINFO pwi
            );

            typedef struct tagWINDOWINFO
            {
                DWORD cbSize;
                RECT rcWindow;
                RECT rcClient;
                DWORD dwStyle;
                DWORD dwExStyle;
                DWORD dwWindowStatus;
                UINT cxWindowBorders;
                UINT cyWindowBorders;
                ATOM atomWindowType;
                WORD wCreatorVersion;
            } WINDOWINFO, *PWINDOWINFO, *LPWINDOWINFO;
            */
            WINDOWINFO windowInfo;
            windowInfo.cbSize = sizeof(WINDOWINFO);
            ret = GetWindowInfo(hwnd, &windowInfo);
            if (!ret) {
                printf("GetWindowInfo hwnd=%p -> fail(%ld)\n", hwnd, GetLastError());
            }
            else {
                printf("GetWindowInfo hwnd=%p -> dwStyle=%ld, dwExStyle=%ld, dwWindowStatus=%ld, cxWindowBorders=%d, cyWindowBorders=%d, wCreatorVersion=%d\n", hwnd, windowInfo.dwStyle, windowInfo.dwExStyle, windowInfo.dwWindowStatus, windowInfo.cxWindowBorders, windowInfo.cyWindowBorders, windowInfo.wCreatorVersion);
            }
            printf("\n");
        }
    }

    return TRUE;
}

int main()
{
    BOOL ret;
    while (true) {
        /*
        typedef struct tagPOINT
        {
            LONG  x;
            LONG  y;
        } POINT, *PPOINT, NEAR *NPPOINT, FAR *LPPOINT;
        */
        POINT point;
        ret = GetCursorPos(&point);
        if (!ret) {
            printf("GetCursorPos -> fail(%ld)\n", GetLastError());
        }
        else {
            printf("GetCursorPos -> (%ld, %ld)\n", point.x, point.y);

            //获取桌面句柄
            HWND desktopHwnd = GetDesktopWindow();

            /*
            BOOL EnumChildWindows(
                HWND hWndParent,         // handle to parent window // 父窗口句柄
                WNDENUMPROC lpEnumFunc,  // callback function // 回调函数的地址
                LPARAM lParam            // application-defined value // 你自已定义的参数
            );
            直到调用到最个一个子窗口被枚举或回调函数返回一个false，否则将一直自动枚举下去。
            */
            ret = EnumChildWindows(desktopHwnd, EnumChildProcess, (LPARAM)&point);
        }

        /*
        WINBASEAPI VOID WINAPI Sleep(
            _In_ DWORD dwMilliseconds
        );
        Sleep会将线程挂起，把CPU让给其它线程，单位是毫秒
        */
        Sleep(20000);
    }

    system("pause");
    return 0;
}