GetDCEx.c File Reference

#include "precomp.h"

Include dependency graph for GetDCEx.c:

Go to the source code of this file.

Macros
#define	DCX_USESTYLE   0x00010000

Functions
void	Test_GetDCEx_Params ()
static LRESULT CALLBACK	WndProc (_In_ HWND hwnd, _In_ UINT uMsg, _In_ WPARAM wParam, _In_ LPARAM lParam)
static ATOM	RegisterClassHelper (PSTR pszClassName, UINT style, WNDPROC pfnWndProc)
static HWND	CreateWindowHelper (PSZ pszClassName, PSZ pszTitle)
static void	Test_GetDCEx_Cached ()
static void	Test_GetDCEx_CS_OWNDC ()
static void	Test_GetDCEx_CS_CLASSDC ()
static void	Test_GetDCEx_CS_Mixed ()
static void	Test_GetDCEx_CS_SwitchedStyle ()
	START_TEST (GetDCEx)

Macro Definition Documentation

DCX_USESTYLE

#define DCX_USESTYLE   0x00010000

Definition at line 10 of file GetDCEx.c.

Function Documentation

CreateWindowHelper()

static HWND CreateWindowHelper ( PSZ  pszClassName, PSZ  pszTitle  )

static

Definition at line 54 of file GetDCEx.c.

{
    return CreateWindowA(pszClassName,
                         pszTitle,
                         WS_OVERLAPPEDWINDOW,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         100,
                         100,
                         NULL,
                         NULL,
                         0,
                         NULL);
}

Referenced by Test_GetDCEx_Cached(), Test_GetDCEx_CS_CLASSDC(), Test_GetDCEx_CS_Mixed(), Test_GetDCEx_CS_OWNDC(), and Test_GetDCEx_CS_SwitchedStyle().

RegisterClassHelper()

static ATOM RegisterClassHelper ( PSTR  pszClassName, UINT  style, WNDPROC  pfnWndProc  )

static

Definition at line 31 of file GetDCEx.c.

{
    WNDCLASSA cls;

    cls.style = style;
    cls.lpfnWndProc = pfnWndProc;
    cls.cbClsExtra = 0;
    cls.cbWndExtra = 0;
    cls.hInstance = GetModuleHandleA(0);
    cls.hIcon = 0;
    cls.hCursor = LoadCursorA(0, IDC_ARROW);
    cls.hbrBackground = GetStockObject(WHITE_BRUSH);
    cls.lpszMenuName = NULL;
    cls.lpszClassName = pszClassName;

    return RegisterClassA(&cls);
}

Referenced by Test_GetDCEx_Cached(), Test_GetDCEx_CS_CLASSDC(), Test_GetDCEx_CS_Mixed(), Test_GetDCEx_CS_OWNDC(), and Test_GetDCEx_CS_SwitchedStyle().

START_TEST()

START_TEST

(

GetDCEx

)

Definition at line 438 of file GetDCEx.c.

{
    Test_GetDCEx_Params();
    Test_GetDCEx_Cached();
    Test_GetDCEx_CS_OWNDC();
    Test_GetDCEx_CS_CLASSDC();
    Test_GetDCEx_CS_Mixed();
    Test_GetDCEx_CS_SwitchedStyle();
}

Test_GetDCEx_Cached()

static void Test_GetDCEx_Cached ( )

static

Definition at line 73 of file GetDCEx.c.

{
    static const PSTR pszClassName = "TestClass_Cached";
    ATOM atomClass;
    HWND hwnd;
    HDC hdc1, hdc2;
    HRGN hrgn;

    atomClass = RegisterClassHelper(pszClassName, 0, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    hwnd = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd != NULL, "Failed to create hwnd\n");

    hdc1 = GetDCEx(hwnd, 0, 0);
    ok(hdc1 == NULL, "GetDCEx should fail\n");
    hrgn = CreateRectRgn(0, 0, 100, 100);
    hdc1 = GetDCEx(hwnd, hrgn, 0);
    ok(hdc1 == NULL, "GetDCEx should fail\n");

    hdc1 = GetDCEx(hwnd, 0, DCX_WINDOW);
    ok(hdc1 == NULL, "GetDCEx should fail\n");
    hdc1 = GetDCEx(hwnd, hrgn, DCX_WINDOW);
    ok(hdc1 == NULL, "GetDCEx should fail\n");

    hdc1 = GetDCEx(hwnd, hrgn, DCX_INTERSECTRGN);
    ok(hdc1 == NULL, "GetDCEx should fail\n");

    hdc1 = GetDCEx(hwnd, hrgn, DCX_PARENTCLIP);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ReleaseDC(hwnd, hdc1);

    hdc1 = GetDCEx(hwnd, hrgn, DCX_WINDOW | DCX_INTERSECTRGN | DCX_PARENTCLIP);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ReleaseDC(hwnd, hdc1);

    hdc1 = GetDCEx(hwnd, 0, DCX_CACHE);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ReleaseDC(hwnd, hdc1);

    hrgn = CreateRectRgn(0, 0, 100, 100);
    hdc2 = GetDCEx(hwnd, hrgn, DCX_CACHE);
    ok(hdc2 != NULL, "GetDCEx failed\n");
    ReleaseDC(hwnd, hdc2);
    ok(hdc2 == hdc1, "Expected the same DC\n");

    hdc1 = GetDCEx(hwnd, 0, DCX_CACHE);
    hdc2 = GetDCEx(hwnd, hrgn, DCX_CACHE);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ok(hdc2 != hdc1, "Expected a different DC\n");
    ReleaseDC(hwnd, hdc1);
    ReleaseDC(hwnd, hdc2);

    hdc1 = GetDCEx(NULL, NULL, 0);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    hdc2 = GetDCEx(NULL, NULL, 0);
    ok(hdc2 != NULL, "GetDCEx failed\n");
    ok(hdc2 != hdc1, "Expected a different DC\n");
    ReleaseDC(hwnd, hdc1);
    ReleaseDC(hwnd, hdc2);

    ok(CombineRgn(hrgn, hrgn, hrgn, RGN_OR) == SIMPLEREGION, "region is not valid");

    DestroyWindow(hwnd);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed");
}

Referenced by START_TEST().

Test_GetDCEx_CS_CLASSDC()

static void Test_GetDCEx_CS_CLASSDC ( )

static

Definition at line 204 of file GetDCEx.c.

{
    static const PSTR pszClassName = "TestClass_CS_CLASSDC";
    ATOM atomClass;
    HWND hwnd1, hwnd2;
    HDC hdc1, hdc2;
    //HRGN hrgn;

    atomClass = RegisterClassHelper(pszClassName, CS_CLASSDC, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    hwnd1 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd1 != NULL, "Failed to create hwnd1\n");

    /* Looks legit, but this is not the DC you are looking for!
       In fact this is NOT the class dc, but an own DC, doh!
       When the first Window is created, the DC for that Window is both it's own
       AND the class DC. But we only get the class DC, when using DCX_USESTYLE */
    hdc1 = GetDCEx(hwnd1, NULL, 0);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    hdc2 = GetDCEx(hwnd1, NULL, 0);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd1, hdc1) == TRUE, "ReleaseDC failed\n");
    ok(ReleaseDC(hwnd1, hdc2) == TRUE, "ReleaseDC failed\n");

    /* Now with DCX_USESTYLE */
    hdc2 = GetDCEx(hwnd1, NULL, DCX_USESTYLE);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd1, hdc2) == TRUE, "ReleaseDC failed\n");

    hwnd2 = CreateWindowHelper(pszClassName, "Test Window2");
    ok(hwnd2 != NULL, "Failed to create hwnd2\n");

    /* Yeah, this doesn't work anymore. Once the */
    hdc2 = GetDCEx(hwnd2, NULL, 0);
    ok(hdc2 == NULL, "Expected failure\n");

    /* Now with DCX_USESTYLE ... */
    hdc2 = GetDCEx(hwnd2, NULL, DCX_USESTYLE);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd2, hdc2) == TRUE, "ReleaseDC failed\n");

    SendMessage(hwnd2, WM_USER, 0, 0);

    DestroyWindow(hwnd1);
    DestroyWindow(hwnd2);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed");
}

Referenced by START_TEST().

Test_GetDCEx_CS_Mixed()

static void Test_GetDCEx_CS_Mixed ( )

static

Definition at line 256 of file GetDCEx.c.

{
    static const PSTR pszClassName = "TestClass_CS_Mixed";
    ATOM atomClass;
    HWND hwnd1,hwnd2, hwnd3;
    HDC hdc1, hdc2, hdc3;

    /* Register a class with CS_OWNDC *and* CS_CLASSDC */
    atomClass = RegisterClassHelper(pszClassName, CS_OWNDC | CS_CLASSDC, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    /* Create the first window, this should create a single own and class DC */
    hwnd1 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd1 != NULL, "Failed to create hwnd1\n");

    /* Verify that we have the right style */
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == (CS_OWNDC | CS_CLASSDC),
       "class style not set\n");

    /* This is now the class DC and the first windows own DC */
    hdc1 = GetDCEx(hwnd1, NULL, 0);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ok(ReleaseDC(hwnd1, hdc1) == TRUE, "ReleaseDC failed\n");

    /* This should get us the own/class DC again */
    hdc2 = GetDCEx(hwnd1, NULL, 0);
    ok(hdc2 == hdc1, "Expected the own/class DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd1, hdc2) == TRUE, "ReleaseDC failed\n");

    /* This should get us the class DC, but it's the same */
    hdc2 = GetDCEx(hwnd1, NULL, DCX_USESTYLE);
    ok(hdc2 == hdc1, "Expected the own/class DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd1, hdc2) == TRUE, "ReleaseDC failed\n");

    /* Create a second window */
    hwnd2 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd1 != NULL, "Failed to create hwnd1\n");

    /* This should get us the own DC of the new window */
    hdc2 = GetDCEx(hwnd2, NULL, 0);
    ok(hdc2 != NULL, "GetDCEx failed\n");
    ok(hdc2 != hdc1, "Expected different DC\n");
    ok(ReleaseDC(hwnd2, hdc2) == TRUE, "ReleaseDC failed\n");

    /* This gets us the own DC again, CS_OWNDC has priority! */
    hdc3 = GetDCEx(hwnd2, NULL, DCX_USESTYLE);
    ok(hdc3 == hdc2, "Expected the own DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd2, hdc3) == TRUE, "ReleaseDC failed\n");

    /* Disable CS_OWNDC */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, CS_CLASSDC) == (CS_OWNDC | CS_CLASSDC), "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == CS_CLASSDC, "class style not set\n");

    /* Since the window already has an own DC, we get it again! */
    hdc3 = GetDCEx(hwnd2, NULL, DCX_USESTYLE);
    ok(hdc3 == hdc2, "Expected the own DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd2, hdc3) == TRUE, "ReleaseDC failed\n");

    /* Disable CS_CLASSDC, too */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, 0) == CS_CLASSDC, "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == 0, "class style not set\n");

    /* With DCX_USESTYLE we only get a cached DC */
    hdc3 = GetDCEx(hwnd2, NULL, DCX_USESTYLE);
    ok(hdc3 != NULL, "GetDCEx failed\n");
    ok(hdc3 != hdc1, "Expected different DC, got class DC\n");
    ok(hdc3 != hdc2, "Expected different DC, got own DC\n");
    ok(ReleaseDC(hwnd2, hdc3) == TRUE, "ReleaseDC failed\n");

    /* Without DCX_USESTYLE we get the own DC */
    hdc3 = GetDCEx(hwnd2, NULL, 0);
    ok(hdc3 != NULL, "GetDCEx failed\n");
    ok(hdc3 != hdc1, "Expected different DC, got class DC\n");
    ok(hdc3 == hdc2, "Expected the own DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd2, hdc3) == TRUE, "ReleaseDC failed\n");

    /* Set only CS_OWNDC */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, CS_OWNDC) == 0, "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == CS_OWNDC, "class style not set\n");

    hwnd3 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd3 != NULL, "Failed to create hwnd1\n");

    /* This should get a new own DC */
    hdc2 = GetDCEx(hwnd3, NULL, 0);
    ok(hdc2 != hdc1, "Expected different DC\n");
    ok(ReleaseDC(hwnd3, hdc2) == TRUE, "ReleaseDC failed\n");

    /* Re-enable CS_CLASSDC */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, (CS_OWNDC | CS_CLASSDC)) == CS_OWNDC, "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == (CS_OWNDC | CS_CLASSDC), "class style not set\n");

    /* This should get us the own DC */
    hdc3 = GetDCEx(hwnd3, NULL, 0);
    ok(hdc3 == hdc2, "Expected the same DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd3, hdc3) == TRUE, "ReleaseDC failed\n");

    /* This should still get us the new own DC */
    hdc3 = GetDCEx(hwnd3, NULL, DCX_USESTYLE);
    ok(hdc3 == hdc2, "Expected the same DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd3, hdc3) == TRUE, "ReleaseDC failed\n");

    /* Disable CS_OWNDC */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, CS_CLASSDC) == (CS_OWNDC | CS_CLASSDC), "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == CS_CLASSDC, "class style not set\n");

    /* This should get us the own DC */
    hdc3 = GetDCEx(hwnd3, NULL, 0);
    ok(hdc3 == hdc2, "Expected the same DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd3, hdc3) == TRUE, "ReleaseDC failed\n");

    /* This should still get us the new own DC */
    hdc3 = GetDCEx(hwnd3, NULL, DCX_USESTYLE);
    ok(hdc3 == hdc2, "Expected the same DC, got %p\n", hdc3);
    ok(ReleaseDC(hwnd3, hdc3) == TRUE, "ReleaseDC failed\n");

    /* cleanup for a second run */
    DestroyWindow(hwnd1);
    DestroyWindow(hwnd2);
    DestroyWindow(hwnd3);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed\n");

    /* Create class again with CS_OWNDC */
    atomClass = RegisterClassHelper(pszClassName, CS_OWNDC, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    hwnd1 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd1 != NULL, "Failed to create hwnd1\n");

    /* This is the windows own DC, the class does not have a class DC yet */
    hdc1 = GetDCEx(hwnd1, NULL, 0);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    ok(ReleaseDC(hwnd1, hdc1) == TRUE, "ReleaseDC failed\n");

    /* Enable only CS_CLASSDC */
    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, CS_CLASSDC) == CS_OWNDC, "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == CS_CLASSDC, "class style not set\n");

    /* Create a second window. Now we should create a class DC! */
    hwnd2 = CreateWindowHelper(pszClassName, "Test Window2");
    ok(hwnd2 != NULL, "Failed to create hwnd1\n");

    /* We expect a new DCE (the class DCE) */
    hdc2 = GetDCEx(hwnd2, NULL, DCX_USESTYLE);
    ok(hdc2 != NULL, "GetDCEx failed\n");
    ok(hdc2 != hdc1, "Expected different DCs\n");
    ok(ReleaseDC(hwnd2, hdc2) == TRUE, "ReleaseDC failed\n");

    /* cleanup */
    DestroyWindow(hwnd1);
    DestroyWindow(hwnd2);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed\n");
}

Referenced by START_TEST().

Test_GetDCEx_CS_OWNDC()

static void Test_GetDCEx_CS_OWNDC ( )

static

Definition at line 143 of file GetDCEx.c.

{
    static const PSTR pszClassName = "TestClass_CS_OWNDC";
    ATOM atomClass;
    HWND hwnd;
    HDC hdc1, hdc2;
    //HRGN hrgn;

    atomClass = RegisterClassHelper(pszClassName, CS_OWNDC, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    hwnd = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd != NULL, "Failed to create hwnd\n");

    hdc1 = GetDCEx(hwnd, NULL, 0);
    ok(hdc1 != NULL, "GetDCEx failed\n");
    hdc2 = GetDCEx(hwnd, NULL, 0);
    ok(hdc2 != NULL, "GetDCEx failed\n");
    ok(hdc2 == hdc1, "Expected the same DC\n");
    ok(ReleaseDC(hwnd, hdc1) == TRUE, "ReleaseDC failed\n");
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    hdc2 = GetDCEx(hwnd, NULL, 0);
    ok(hdc2 == hdc1, "Expected the same DC\n");
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    hdc2 = GetDCEx(hwnd, NULL, DCX_CACHE);
    ok(hdc2 != hdc1, "Expected a different DC\n");
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    hdc2 = GetDCEx(hwnd, NULL, DCX_WINDOW);
    ok(hdc2 == hdc1, "Expected the same DC\n");
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    /* Try after resetting CS_OWNDC in the class */
    ok(SetClassLongPtrA(hwnd, GCL_STYLE, 0) == CS_OWNDC, "class style wrong\n");
    hdc2 = GetDCEx(hwnd, NULL, 0);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    /* Try after setting CS_CLASSDC in the class */
    ok(SetClassLongPtrA(hwnd, GCL_STYLE, CS_CLASSDC) == 0, "class style not set\n");
    hdc2 = GetDCEx(hwnd, NULL, 0);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    /* CS_OWNDC and CS_CLASSDC? Is that even legal? */
    ok(SetClassLongPtrA(hwnd, GCL_STYLE, (CS_OWNDC | CS_CLASSDC)) == CS_CLASSDC, "class style not set\n");
    hdc2 = GetDCEx(hwnd, NULL, 0);
    ok(hdc2 == hdc1, "Expected the same DC, got %p\n", hdc2);
    ok(ReleaseDC(hwnd, hdc2) == TRUE, "ReleaseDC failed\n");

    SetClassLongPtrA(hwnd, GCL_STYLE, CS_OWNDC);

    DestroyWindow(hwnd);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed");
}

Referenced by START_TEST().

Test_GetDCEx_CS_SwitchedStyle()

static void Test_GetDCEx_CS_SwitchedStyle ( )

static

Definition at line 414 of file GetDCEx.c.

{
    static const PSTR pszClassName = "TestClass_CS_SwitchedStyle";
    ATOM atomClass;
    HWND hwnd1, hwnd2;

    atomClass = RegisterClassHelper(pszClassName, CS_OWNDC, WndProc);
    ok(atomClass != 0, "Failed to register class\n");

    hwnd1 = CreateWindowHelper(pszClassName, "Test Window1");
    ok(hwnd1 != NULL, "Failed to create hwnd1\n");

    ok(SetClassLongPtrA(hwnd1, GCL_STYLE, CS_CLASSDC) == CS_OWNDC, "unexpected style\n");
    ok(GetClassLongPtrA(hwnd1, GCL_STYLE) == CS_CLASSDC, "class style not set\n");

    hwnd2 = CreateWindowHelper(pszClassName, "Test Window2");
    ok(hwnd2 != NULL, "Failed to create hwnd2\n");

    DestroyWindow(hwnd1);
    DestroyWindow(hwnd2);
    ok(UnregisterClass(pszClassName, GetModuleHandleA(0)) == TRUE,
       "UnregisterClass failed\n");
}

Referenced by START_TEST().

Test_GetDCEx_Params()

void Test_GetDCEx_Params

(

)

Definition at line 12 of file GetDCEx.c.

{

}

Referenced by START_TEST().

WndProc()

static LRESULT CALLBACK WndProc ( _In_ HWND  hwnd, _In_ UINT  uMsg, _In_ WPARAM  wParam, _In_ LPARAM  lParam  )

static

Definition at line 20 of file GetDCEx.c.

{
    return TRUE;
}

Referenced by Test_GetDCEx_Cached(), Test_GetDCEx_CS_CLASSDC(), Test_GetDCEx_CS_Mixed(), Test_GetDCEx_CS_OWNDC(), and Test_GetDCEx_CS_SwitchedStyle().