win32-EnumChildWindows的使用

#include <Windows.h>
#include <iostream>
#include <string>

static BOOL CALLBACK enumchildWindowCallback(HWND hWnd, LPARAM lparam) {
    int length = GetWindowTextLength(hWnd);
    char * buffer = new char[length + 1];
    GetWindowText(hWnd, buffer, length + 1);
    std::string windowTitle(buffer);

    std::cout << hWnd << ":  " << windowTitle << std::endl;
    delete buffer;
    return TRUE;
}

int main()
{
    HWND hwnd = (HWND)0x000D0DEE; //父窗口的句柄
    EnumChildWindows(hwnd, enumchildWindowCallback, NULL);

    std::cin.ignore();
    return 0;
}

拓展： 使用EnumWindows枚举窗口句柄（不包括子窗口）

#include <Windows.h>
#include <string>
#include <iostream>

static BOOL CALLBACK enumchildWindowCallback(HWND hWnd, LPARAM lparam) {
int length = GetWindowTextLength(hWnd);
char* buffer = new char[length + 1];
GetWindowText(hWnd, buffer, length + 1);
std::string windowTitle(buffer);

int n = (int)hWnd;
// Ignore windows if invisible or missing a title
//    if (IsWindowVisible(hWnd) && length != 0) {
std::cout << n << ": " << windowTitle << std::endl;
//    }

delete buffer;

return TRUE;
}

static BOOL CALLBACK enumWindowCallback(HWND hWnd, LPARAM m) {
TCHAR _classbuf[255];
int length = GetWindowTextLength(hWnd);
char* buffer = new char[length + 1];
GetWindowText(hWnd, buffer, length + 1);
std::string windowTitle(buffer);
m = GetClassName(hWnd, _classbuf, 1024);
int n = (int)hWnd;
// Ignore windows if invisible or missing a title
//    if (IsWindowVisible(hWnd) && length != 0) {
std::cout << n << ": " << windowTitle << std::endl;
//    EnumChildWindows(hWnd, enumchildWindowCallback, m);
//    }
return TRUE;
}

int main()
{
std::cout << "Enmumerating windows..." << std::endl;
EnumWindows(enumWindowCallback, NULL);

std::cin.ignore();
return 0;

}

如果去掉EnumChildWindows(hWnd, enumWindowCallback, m)的注释，将会枚举所有的窗口

更新之后的版本：

#include <Windows.h>
#include <iostream>
#include <tchar.h>


static BOOL CALLBACK enumchildWindowCallback(HWND hWnd, LPARAM lparam) {    
    TCHAR buffer[256] = {};
    GetWindowText(hWnd, buffer, 256);
    int n = (int)hWnd;
    if (IsWindowVisible(hWnd)) 
    {
        RECT rc;
        GetWindowRect(hWnd, &rc);
        _tprintf(TEXT("0x%x : %s  %d %d
"), n, buffer, rc.right - rc.left, rc.bottom - rc.top);
    }
    return TRUE;
}

static BOOL CALLBACK enumWindowCallback(HWND hWnd, LPARAM m) {
    TCHAR buffer[256] = {};
    GetWindowText(hWnd, buffer, 256);
    int n = (int)hWnd;    
    if (IsWindowVisible(hWnd)) 
    {
        RECT rc;
        GetWindowRect(hWnd, &rc);
        _tprintf(TEXT("0x%x : %s  %d %d
"), n, buffer, rc.right - rc.left, rc.bottom - rc.top);
        EnumChildWindows(hWnd, enumchildWindowCallback, m);
    }
    return TRUE;
}

int main()
{
    _tprintf(TEXT("Enmumerating windows..."));
    EnumWindows(enumWindowCallback, NULL);

    return 0;

}