目前我在 WM_CREATE 中创建了一个复选框:
hwndButtonPollFlag =
CreateWindow(
TEXT("BUTTON"),
TEXT(sA.getMonitor(monitorSelected)->szDevice),
WS_CHILD | WS_VISIBLE | SS_WHITERECT | BS_CHECKBOX,
0,
0,
0,
0,
hwnd,
(HMENU)IDB_PollFlag,
hInstance,
NULL);
每当单击另一个按钮时,我试图更改它的值:
if (sA.getScreenArray(monitorSelected)->getPollFlag())
{
SetWindowLongPtr(hwndButtonPollFlag, GCL_STYLE, WS_VISIBLE | BST_CHECKED);
}
else
{
SetWindowLongPtr(hwndButtonPollFlag, GCL_STYLE, WS_VISIBLE | BST_UNCHECKED);
}
SetWindowText(hwndButtonPollFlag, TEXT(sA.getMonitor(monitorSelected)->szDevice));
这确实会更改显示在复选框旁边的文本,但不会更改按钮的实际状态。此外,我希望复选框只有两种状态(选中或未选中),除了按钮返回之外,是否还有其他方法可以创建该效果:
switch (HIWORD(wParam))
{
case BST_CHECKED:
sA.getScreenArray(monitorSelected)->setPollFlag(true);
return 0;
case BST_INDETERMINATE:
if (sA.getScreenArray(monitorSelected)->getPollFlag())
{
SetWindowLongPtr(hwndButtonPollFlag, GCL_STYLE, WS_VISIBLE | BST_UNCHECKED);
}
else
{
SetWindowLongPtr(hwndButtonPollFlag, GCL_STYLE, WS_VISIBLE | BST_CHECKED);
}
return 0;
case BST_UNCHECKED:
sA.getScreenArray(monitorSelected)->setPollFlag(false);
return 0;
}
编辑:正如 Mark Ransom 所说,我使用带有 BM_GETCHECK 和 BM_SETCHECK 标志的消息:
case IDB_MONITOR:
monitorSelected = LOWORD(lParam);
if (sA.getScreenArray(monitorSelected)->getPollFlag())
{
SendMessage(hwndButtonPollFlag, BM_SETCHECK, BST_CHECKED, NULL);
}
else
{
SendMessage(hwndButtonPollFlag, BM_SETCHECK, BST_UNCHECKED, NULL);
}
SetWindowText(hwndButtonPollFlag, TEXT(sA.getMonitor(monitorSelected)->szDevice));
return 0;
case WM_COMMAND:
//sA.getScreenArray(monitorSelected)->setPollFlag(LOWORD(lParam));
switch (LOWORD(wParam))
{
case IDB_PollFlag:
if (SendMessage(GetDlgItem(hwnd, IDB_PollFlag), BM_GETCHECK, 0, 0) == BST_CHECKED)
{
SendMessage(hwndButtonPollFlag, BM_SETCHECK, BST_CHECKED, NULL);
sA.getScreenArray(monitorSelected)->setPollFlag(true);
}
else {
SendMessage(hwndButtonPollFlag, BM_SETCHECK, BST_UNCHECKED, NULL);
sA.getScreenArray(monitorSelected)->setPollFlag(false);
}
break;
}
return 0;
最佳答案
您需要发送 BM_SETCHECK
消息。
SendMessage(hwndButtonPollFlag, BM_SETCHECK, BST_CHECKED, 0);
关于c++ - 使用 WINAPI 如何更改复选框按钮的值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27257368/