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win32: use HINST_THISCOMPONENT

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This is a common idiom used in MSDN docs and Raymond Chen's example
programs to get a HINSTANCE for the current module, regardless of
whether it's an .exe or a .dll. Using GetModuleHandle(NULL) for this is
technically incorrect, since it always gets a handle to the .exe, even
when the executing code (in libmpv) is running in a .dll. In this case,
using the wrong HINSTANCE could cause namespace issues with window
classes, since CreateWindowEx uses the HINSTANCE to search for the
matching window class name.

See:
https://blogs.msdn.microsoft.com/oldnewthing/20050418-59/?p=35873
https://blogs.msdn.microsoft.com/oldnewthing/20041025-00/?p=37483
This commit is contained in:
James Ross-Gowan 2016-06-10 22:37:29 +10:00 committed by wm4
parent de4c74e5a4
commit 9fcc517cee
2 changed files with 13 additions and 9 deletions
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7
video/out/opengl/context_dxinterop.c
View File

@ -27,6 +27,9 @@
// For WGL_ACCESS_WRITE_DISCARD_NV, etc.
#include <GL/wglext.h>
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
#define HINST_THISCOMPONENT ((HINSTANCE)&__ImageBase)
// mingw-w64 header typo?
#ifndef IDirect3DSwapChain9Ex_GetBackBuffer
#define IDirect3DSwapChain9Ex_GetBackBuffer IDirect3DSwapChain9EX_GetBackBuffer
@ -99,7 +102,7 @@ static int os_ctx_create(struct MPGLContext *ctx)
.cbSize = sizeof(WNDCLASSEXW),
.style = CS_OWNDC,
.lpfnWndProc = DefWindowProc,
.hInstance = GetModuleHandleW(NULL),
.hInstance = HINST_THISCOMPONENT,
.lpszClassName = os_wnd_class,
});
@ -107,7 +110,7 @@ static int os_ctx_create(struct MPGLContext *ctx)
// possible to use the VO window, but MSDN recommends against drawing to
// the same window with flip mode present and other APIs, so play it safe.
p->os_wnd = CreateWindowExW(0, os_wnd_class, os_wnd_class, 0, 0, 0, 200,
200, NULL, NULL, GetModuleHandleW(NULL), NULL);
200, NULL, NULL, HINST_THISCOMPONENT, NULL);
p->os_dc = GetDC(p->os_wnd);
if (!p->os_dc) {
MP_FATAL(ctx->vo, "Couldn't create window for offscreen rendering\n");

15
video/out/w32_common.c
View File

@ -45,6 +45,9 @@
#include "misc/rendezvous.h"
#include "mpv_talloc.h"
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
#define HINST_THISCOMPONENT ((HINSTANCE)&__ImageBase)
static const wchar_t classname[] = L"mpv";
static __thread struct vo_w32_state *w32_thread_context;
@ -1178,7 +1181,7 @@ static void gui_thread_reconfig(void *ptr)
vo->dheight = r.bottom;
}
// Recenter window around old position on new video size
// Recenter window around old position on new video size
// excluding the case when initial positon handled by win_state.
if (!pos_init) {
w32->window_x += w32->dw / 2 - vo->dwidth / 2;
@ -1221,14 +1224,12 @@ static void *gui_thread(void *ptr)
thread_disable_ime();
HINSTANCE hInstance = GetModuleHandleW(NULL);
WNDCLASSEXW wcex = {
.cbSize = sizeof wcex,
.style = CS_HREDRAW | CS_VREDRAW,
.lpfnWndProc = WndProc,
.hInstance = hInstance,
.hIcon = LoadIconW(hInstance, L"IDI_ICON1"),
.hInstance = HINST_THISCOMPONENT,
.hIcon = LoadIconW(HINST_THISCOMPONENT, L"IDI_ICON1"),
.hCursor = LoadCursor(NULL, IDC_ARROW),
.lpszClassName = classname,
};
@ -1246,13 +1247,13 @@ static void *gui_thread(void *ptr)
classname,
WS_CHILD | WS_VISIBLE,
0, 0, r.right, r.bottom,
w32->parent, 0, hInstance, NULL);
w32->parent, 0, HINST_THISCOMPONENT, NULL);
} else {
w32->window = CreateWindowExW(0, classname,
classname,
update_style(w32, 0),
CW_USEDEFAULT, SW_HIDE, 100, 100,
0, 0, hInstance, NULL);
0, 0, HINST_THISCOMPONENT, NULL);
}
if (!w32->window) {