Converting from an integer to HWND (which is a pointer) requires
an explicit cast, otherwise Clang errors out like this:
src/libavdevice/gdigrab.c:280:14: error: incompatible integer to pointer
conversion assigning to 'HWND' (aka 'struct HWND__ *') from 'long'
[-Wint-conversion]
280 | hwnd = strtol(name, &p, 0);
| ^ ~~~~~~~~~~~~~~~~~~~
(With GCC and MSVC, this was a mere warning, but with recent Clang,
this is an error.)
After adding a cast, all compilers also warn something like this:
src/libavdevice/gdigrab.c:280:16: warning: cast to 'HWND' (aka 'struct
HWND__ *') from smaller integer type 'long' [-Wint-to-pointer-cast]
280 | hwnd = (HWND) strtol(name, &p, 0);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
On Windows, long types are 32 bit, so to get a usable pointer, we
need to use long long. And interpret it as unsigned long long
while at it - i.e. using strtoull.
Finally, right above it, the code triggered the following warning:
src/libavdevice/gdigrab.c:278:15: warning: mixing declarations and code is
incompatible with standards before C99 [-Wdeclaration-after-statement]
278 | char *p;
| ^
---
libavdevice/gdigrab.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavdevice/gdigrab.c b/libavdevice/gdigrab.c
index 41ef370f2b..b2858ecd89 100644
--- a/libavdevice/gdigrab.c
+++ b/libavdevice/gdigrab.c
@@ -274,10 +274,10 @@ gdigrab_read_header(AVFormatContext *s1)
} else if (!strcmp(filename, "desktop")) {
hwnd = NULL;
} else if (!strncmp(filename, "hwnd=", 5)) {
- name = filename + 5;
char *p;
+ name = filename + 5;
- hwnd = strtol(name, &p, 0);
+ hwnd = (HWND) strtoull(name, &p, 0);
if (p == NULL || p == name || p[0] == '\0')
{
--
2.34.1
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