Superior way to dynamically open beatmaps
The only way i've seen people automatically read and parse beatmap files is by doing this:
1. Continually reading the window title of the game.
2. Parsing the osu!.db file.
3. Using the above 2 to open a handle to the beatmap.
This is sloppy because downloading a new beatmap isn't updated in the .db file, and reading the window title constantly is expensive. So here's a better alternative that loads the file the moment a handle is opened to the file from the game in the song selection menu. It's also very simple with only a few lines of code. Hook CreateFileW, check for .osu in lpFileName inside the hook using wcsstr. If it's found, open and parse the file.
1. Continually reading the window title of the game.
2. Parsing the osu!.db file.
3. Using the above 2 to open a handle to the beatmap.
This is sloppy because downloading a new beatmap isn't updated in the .db file, and reading the window title constantly is expensive. So here's a better alternative that loads the file the moment a handle is opened to the file from the game in the song selection menu. It's also very simple with only a few lines of code. Hook CreateFileW, check for .osu in lpFileName inside the hook using wcsstr. If it's found, open and parse the file.
Code:
typedef HANDLE(WINAPI *tCreateFileW)(LPCWSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE);
tCreateFileW oCreateFileW = NULL;
std::ifstream osuBeatFile;
HANDLE WINAPI DetourCreateFileW(LPCWSTR lpFileName, DWORD dwDesireAccess, DWORD dwShareMode, LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes, HANDLE hTemplateFile)
{
if (wcsstr(lpFileName, L".osu"))
{
osuBeatFile.open(lpFileName, std::ios::in);
//Parse Beatmap here
osuBeatFile.close();
}
return oCreateFileW(lpFileName, dwDesireAccess, dwShareMode, lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
}
void InstallHooks()
{
// Install CreateFileW hook here.
}
Originally Posted by sunkist0
