0
我一直在使用Windows API自定義窗口擺弄。就這樣，我一直在使用Extended Layered Windows。我畫了窗口，它可以工作。然而，當調整窗口大小時，當重繪/ UpdateLayeredWindow（和UpdateLayeredWindowIndirect）方法被調用時，會出現奇怪的閃爍/閃爍[（Screenshot）] [1]。有什麼我在這裏做錯了嗎？Visual-C Win32 API分層窗口閃爍
void redrawBaseWindow(HWND window) {
RECT rect;
GetWindowRect(window, &rect);
int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
HDC mainDC = GetDC(NULL);
POINT destination = { rect.left,rect.top };
POINT zero = destination;
SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.AlphaFormat = 0;
bf.SourceConstantAlpha = 255;
HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
HBRUSH oldbrush = SelectObject(mainDC, brush);
HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
HPEN oldPen = SelectObject(mainDC, pen);
HBITMAP bmp = CreateCompatibleBitmap(mainDC, size.cx,size.cy);
HBITMAP oldBmp = SelectObject(mainDC, bmp);
FillRect(mainDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
Rectangle(mainDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
Rectangle(mainDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, mainDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
UpdateLayeredWindowIndirect(window, &updated);
//BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
SelectObject(mainDC, oldbrush);
SelectObject(mainDC, oldBmp);
SelectObject(mainDC, oldPen);
DeleteObject(brush);
DeleteObject(bmp);
DeleteObject(pen);
}
以防萬一，窗口消息處理。
long __stdcall WndProc(HWND window, unsigned int msg, WPARAM wp, LPARAM lp) {
PAINTSTRUCT ps;
HDC hdc;
TCHAR greeting[] = "Hello, World!";
RECT rect_window;
GetWindowRect(window, &rect_window);
switch (msg) {
case WM_SYSKEYDOWN:
MessageBeep(MB_ICONERROR);
case WM_CREATE:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_NCHITTEST:;
int x = LOWORD(lp);
int y = HIWORD(lp);
if (x > rect_window.left && x<rect_window.right && y>rect_window.top && y < rect_window.top + 25)
return HTCAPTION;
if (x>=rect_window.left-3 && x<=rect_window.left+3)
return HTLEFT;
if (x >= rect_window.right - 3 && x <= rect_window.right + 3)
return HTRIGHT;
if (y >= rect_window.top - 3 && y <= rect_window.top + 3)
return HTTOP;
if (y >= rect_window.bottom - 3 && y <= rect_window.bottom + 3)
return HTBOTTOM;
break;
case WM_LBUTTONDOWN:
break;
case WM_SIZE:
redrawBaseWindow(window);
break;
case WM_PAINT:
break;
}
return DefWindowProc(window, msg, wp, lp);
}
編輯2： 使用CreateCompatibleDC值成UpdateLayeredWindow [而且不工作]
void redrawBaseWindow(HWND window) {
RECT rect;
GetWindowRect(window, &rect);
int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
HDC mainDC = GetDC(NULL);
HDC memDC = CreateCompatibleDC(mainDC);
POINT destination = { rect.left,rect.top };
POINT zero = destination;
SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.AlphaFormat = 0;
bf.SourceConstantAlpha = 255;
HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
HBRUSH oldbrush = SelectObject(memDC, brush);
HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
HPEN oldPen = SelectObject(memDC, pen);
HBITMAP bmp = CreateCompatibleBitmap(memDC, size.cx,size.cy);
HBITMAP oldBmp = SelectObject(memDC, bmp);
FillRect(memDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
Rectangle(memDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
Rectangle(memDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
Ellipse(memDC, rect.left + elipseDiam, rect.top + elipseDiam, rect.left, rect.top); //Top-Left
Ellipse(memDC, rect.right - elipseDiam, rect.top, rect.right, rect.top + elipseDiam); //Top-Right
Ellipse(memDC, rect.left, rect.bottom, rect.left + elipseDiam, rect.bottom - elipseDiam); //Bottom-Left
Ellipse(memDC, rect.right - elipseDiam, rect.bottom, rect.right, rect.bottom - elipseDiam); //Bottom-Right
UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, memDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
UpdateLayeredWindowIndirect(window, &updated);
//BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
SelectObject(memDC, oldbrush);
SelectObject(memDC, oldBmp);
SelectObject(memDC, oldPen);
DeleteObject(brush);
DeleteObject(bmp);
DeleteObject(pen);
ReleaseDC(NULL,mainDC);
ReleaseDC(NULL,memDC);
}
編輯3：DeleteDC CreateCompatibleDC裝置，以及位圖的創建上在屏幕上DC而不是CompatibleDC
void redrawBaseWindow(HWND window) {
RECT rect;
GetWindowRect(window, &rect);
int elipseDiam = ((rect.right - rect.left)+(rect.bottom-rect.top))/2*0.025;
HDC mainDC = GetDC(NULL);
HDC memDC = CreateCompatibleDC(mainDC);
POINT destination = { rect.left,rect.top };
POINT zero = destination;
SIZE size = { rect.right - rect.left,rect.bottom - rect.top };
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.AlphaFormat = 0;
bf.SourceConstantAlpha = 255;
HBRUSH brush = CreateSolidBrush(RGB(255, 0, 100));
HBRUSH oldbrush = SelectObject(memDC, brush);
HPEN pen = CreatePen(PS_NULL, 0, RGB(0, 0, 0));
HPEN oldPen = SelectObject(memDC, pen);
HBITMAP bmp = CreateCompatibleBitmap(mainDC, size.cx,size.cy);
HBITMAP oldBmp = SelectObject(memDC, bmp);
FillRect(memDC, &rect, CreateSolidBrush(RGB(0, 0, 0)));
Rectangle(memDC, rect.left, rect.top + elipseDiam/2, rect.right, rect.bottom - elipseDiam/2);
Rectangle(memDC, rect.left + elipseDiam/2, rect.top, rect.right - elipseDiam/2, rect.bottom);
Ellipse(memDC, rect.left + elipseDiam, rect.top + elipseDiam, rect.left, rect.top); //Top-Left
Ellipse(memDC, rect.right - elipseDiam, rect.top, rect.right, rect.top + elipseDiam); //Top-Right
Ellipse(memDC, rect.left, rect.bottom, rect.left + elipseDiam, rect.bottom - elipseDiam); //Bottom-Left
Ellipse(memDC, rect.right - elipseDiam, rect.bottom, rect.right, rect.bottom - elipseDiam); //Bottom-Right
UPDATELAYEREDWINDOWINFO updated = { sizeof(UPDATELAYEREDWINDOWINFO), NULL, &destination, &size, memDC, &zero, RGB(0,0,0),&bf, ULW_COLORKEY, &rect};
UpdateLayeredWindowIndirect(window, &updated);
//BOOL error = UpdateLayeredWindow(window, NULL, &destination, &size, mainDC, &zero, RGB(0, 0, 0), &bf, ULW_COLORKEY);
SelectObject(memDC, oldbrush);
SelectObject(memDC, oldBmp);
SelectObject(memDC, oldPen);
DeleteObject(brush);
DeleteObject(bmp);
DeleteObject(pen);
DeleteDC(memDC);
ReleaseDC(NULL,mainDC);
}
原始閃爍固定。謝謝[喬納森Pottar] 但是已經發生的另一個錯誤：This
請創建一個動畫gif截圖，我看不到您的圖像上的問題。 – Lothar
只需一小會兒 – UnknownRobotik
從'GetDC'獲得的DC中選擇一個不同的位圖有點奇怪，我不確定是否支持將屏幕的DC傳遞給'UpdateLayeredWindow'。正常的用法是將你的位圖選擇到從'CreateCompatibleDC'獲得的內存DC中，渲染並從中更新窗口。你也有一個GDI資源泄漏（不調用'ReleaseDC'）。 –