如何知道EnumWindows何时完成窗口列表？

Question

如何知道EnumWindows何时完成窗口列表？因为EnumWindows接收一个回调函数作为参数,并且它一直调用它直到不再列出的窗口.

Answer 1

EnumWindows()枚举正在进行中.当EnumWindows()完透过窗户枚举,它返回BOOL.

以下代码段:

#include <windows.h>
#include <cstdio>

BOOL CALLBACK MyEnumWindowsProc(HWND hwnd, LPARAM lparam)
{
    int& i = *(reinterpret_cast<int*>(lparam));
    ++i;
    char title[256];
    ::GetWindowText(hwnd, title, sizeof(title));
    ::printf("Window #%d (%x): %s\n", i, hwnd, title);
    return TRUE;
}

int main()
{
    int i = 0;
    ::printf("Starting EnumWindows()\n");
    ::EnumWindows(&MyEnumWindowsProc, reinterpret_cast<LPARAM>(&i));
    ::printf("EnumWindows() ended\n");
    return 0;
}

给我一个像这样的输出:

Starting EnumWindows()
Window #1 (<hwnd>): <title>
Window #2 (<hwnd>): <title>
Window #3 (<hwnd>): <title>
<and so on...>
EnumWindows() ended

所以EnumWindows()绝对要以同步方式枚举.