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win-capture: Clarify inject helper intervals

master
jp9000 2015-01-06 01:55:17 -08:00
parent 2e6010b36d
commit 67ed290148
1 changed files with 13 additions and 2 deletions
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15
plugins/win-capture/inject-helper/inject-helper.c
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@ -30,6 +30,10 @@ static void load_debug_privilege(void)
typedef HHOOK (WINAPI *set_windows_hook_ex_t)(int, HOOKPROC, HINSTANCE, DWORD);
#define RETRY_INTERVAL_MS 500
#define TOTAL_RETRY_TIME_MS 4000
#define RETRY_COUNT (TOTAL_RETRY_TIME_MS / RETRY_INTERVAL_MS)
static int inject_library_safe(DWORD thread_id, const char *dll)
{
HMODULE user32 = GetModuleHandleW(L"USER32");
@ -61,8 +65,15 @@ static int inject_library_safe(DWORD thread_id, const char *dll)
return -5;
}
for (i = 0; i < 8; i++) {
Sleep(500);
/* SetWindowsHookEx does not inject the library in to the target
* process unless the event associated with it has occurred, so
* repeatedly send the hook message to start the hook at small
* intervals to signal to SetWindowsHookEx to process the message and
* therefore inject the library in to the target process. Repeating
* this is mostly just a precaution. */
for (i = 0; i < RETRY_COUNT; i++) {
Sleep(RETRY_INTERVAL_MS);
PostThreadMessage(thread_id, WM_USER + 432, 0, (LPARAM)hook);
}
return 0;