WM_CTLCOLORSTATIC从未在WIN32应用程序中触发

WM_CTLCOLORSTATIC is never triggered in WIN32 app

本文关键字：应用程序 WIN32 CTLCOLORSTATIC WM      更新时间：2023-10-16

我正在用C++做一个Win32应用程序。我有一个静态窗口，我想改变背景的颜色。

我遵循了这里的建议：如何通过程序设置静态控件的背景色

但在我的情况下，WM_CTLCOLORSTATIC从未被触发。你知道怎么会发生什么吗？

这是我的一些代码：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
case WM_CTLCOLORSTATIC:
hdc = reinterpret_cast<HDC>(wParam);
SetTextColor(hdc, RGB(2000, 50, 100));
SetBkColor(hdc, RGB(20, 150, 100));
if (!hBrushLabel) hBrushLabel = CreateSolidBrush(RGB(20, 150, 100));
return reinterpret_cast<LRESULT>(hBrushLabel);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;
case WM_CREATE:
hBrushLabel = NULL;
AddBuyButtons(hWnd);
AddText(hWnd);
AddCartonesSlots(hWnd);
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
if (hBrushLabel) DeleteObject(hBrushLabel);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

我检查过的变化函数叫做：

DWORD WINAPI changecolor(HWND h)
{
if (hBrushLabel) {
DeleteObject(hBrushLabel);
hBrushLabel = NULL;
}
InvalidateRect(h, NULL, TRUE);
return 0;
}

希望你能帮助我！

WM_CTLCOLORSTATIC是它自己的窗口消息，但您正在处理它，就好像它是WM_COMMAND消息的菜单ID一样。您需要将case WM_CTLCOLORSTATIC处理程序从内部switch块移动到外部switch块：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
}
}
break;
// MOVED HERE!!!
case WM_CTLCOLORSTATIC:
hdc = reinterpret_cast<HDC>(wParam);
SetTextColor(hdc, RGB(2000, 50, 100));
SetBkColor(hdc, RGB(20, 150, 100));
if (!hBrushLabel) hBrushLabel = CreateSolidBrush(RGB(20, 150, 100));
return reinterpret_cast<LRESULT>(hBrushLabel);
break;
case WM_CREATE:
hBrushLabel = NULL;
AddBuyButtons(hWnd);
AddText(hWnd);
AddCartonesSlots(hWnd);
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
if (hBrushLabel) DeleteObject(hBrushLabel);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
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