Use GetDC instead of CreateDC where possible.

dlls/comctl32/treeview.c

@@ -4823,7 +4823,6 @@ TREEVIEW_MouseWheel(TREEVIEW_INFO *infoPtr, WPARAM wParam)
 static LRESULT
 TREEVIEW_Create(HWND hwnd, const CREATESTRUCTW *lpcs)
 {
-    static const WCHAR szDisplayW[] = { 'D','I','S','P','L','A','Y','\0' };
     RECT rcClient;
     TREEVIEW_INFO *infoPtr;
     LOGFONTW lf;
@@ -4931,7 +4930,7 @@ TREEVIEW_Create(HWND hwnd, const CREATESTRUCTW *lpcs)
 	infoPtr->himlState =
 	    ImageList_Create(16, 16, ILC_COLOR | ILC_MASK, 3, 0);
 
-	hdcScreen = CreateDCW(szDisplayW, NULL, NULL, NULL);
+	hdcScreen = GetDC(0);
 
 	/* Create a coloured bitmap compatible with the screen depth
 	   because checkboxes are not black&white */
@@ -4959,7 +4958,7 @@ TREEVIEW_Create(HWND hwnd, const CREATESTRUCTW *lpcs)
 
 	DeleteObject(hbm);
 	DeleteDC(hdc);
-	DeleteDC(hdcScreen);
+	ReleaseDC(0, hdcScreen);
 
 	infoPtr->stateImageWidth = 16;
 	infoPtr->stateImageHeight = 16;

dlls/ddraw/main.c

@@ -164,9 +164,9 @@ DDRAW_Create(GUID *guid,
     This->ImplType = DefaultSurfaceType;
 
     /* Get the current screen settings */
-    hDC = CreateDCA("DISPLAY", NULL, NULL, NULL);
+    hDC = GetDC(0);
     This->orig_bpp = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);
-    DeleteDC(hDC);
+    ReleaseDC(0, hDC);
     This->orig_width = GetSystemMetrics(SM_CXSCREEN);
     This->orig_height = GetSystemMetrics(SM_CYSCREEN);
 

dlls/wined3d/device.c

@@ -1440,9 +1440,9 @@ static HRESULT WINAPI IWineD3DDeviceImpl_CreateAdditionalSwapChain(IWineD3DDevic
         RECT     clip_rc;
 
         /* Get info on the current display setup */
-        hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
+        hdc = GetDC(0);
         bpp = GetDeviceCaps(hdc, BITSPIXEL);
-        DeleteDC(hdc);
+        ReleaseDC(0, hdc);
 
         /* Change the display settings */
         memset(&devmode, 0, sizeof(DEVMODEW));

dlls/wined3d/directx.c

@@ -2439,9 +2439,9 @@ static HRESULT  WINAPI IWineD3DImpl_CreateDevice(IWineD3D *iface, UINT Adapter,
     /* Get the initial screen setup for ddraw */
     object->ddraw_width = GetSystemMetrics(SM_CXSCREEN);
     object->ddraw_height = GetSystemMetrics(SM_CYSCREEN);
-    hDC = CreateDCA("DISPLAY", NULL, NULL, NULL);
+    hDC = GetDC(0);
     object->ddraw_format = pixelformat_for_depth(GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES));
-    DeleteDC(hDC);
+    ReleaseDC(0, hDC);
 
     return WINED3D_OK;
 create_device_error:

dlls/wined3d/surface.c

@@ -1370,7 +1370,7 @@ HRESULT WINAPI IWineD3DSurfaceImpl_GetDC(IWineD3DSurface *iface, HDC *pHDC) {
                 break;
         }
 
-        ddc = CreateDCA("DISPLAY", NULL, NULL, NULL);
+        ddc = GetDC(0);
         if (ddc == 0) {
             HeapFree(GetProcessHeap(), 0, b_info);
             return HRESULT_FROM_WIN32(GetLastError());
@@ -1378,7 +1378,7 @@ HRESULT WINAPI IWineD3DSurfaceImpl_GetDC(IWineD3DSurface *iface, HDC *pHDC) {
 
         TRACE("Creating a DIB section with size %dx%dx%d, size=%d\n", b_info->bmiHeader.biWidth, b_info->bmiHeader.biHeight, b_info->bmiHeader.biBitCount, b_info->bmiHeader.biSizeImage);
         This->dib.DIBsection = CreateDIBSection(ddc, b_info, usage, &This->dib.bitmap_data, 0 /* Handle */, 0 /* Offset */);
-        DeleteDC(ddc);
+        ReleaseDC(0, ddc);
 
         if (!This->dib.DIBsection) {
             ERR("CreateDIBSection failed!\n");

dlls/wined3d/swapchain.c

@@ -489,9 +489,9 @@ static HRESULT WINAPI IWineD3DSwapChainImpl_GetDisplayMode(IWineD3DSwapChain *if
     pMode->Height       = GetSystemMetrics(SM_CYSCREEN);
     pMode->RefreshRate  = 85; /* FIXME: How to identify? */
 
-    hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
+    hdc = GetDC(0);
     bpp = GetDeviceCaps(hdc, BITSPIXEL);
-    DeleteDC(hdc);
+    ReleaseDC(0, hdc);
 
     switch (bpp) {
     case  8: pMode->Format       = WINED3DFMT_R8G8B8; break;