HMCLauncher: try bundled JRE

HMCLauncher/HMCL/os.cpp

@@ -0,0 +1,108 @@
+#include "stdafx.h"
+#include "os.h"
+
+using namespace std;
+
+LSTATUS MyRegQueryValue(HKEY hKey, LPCWSTR subKey, DWORD dwType, wstring &out)
+{
+	DWORD dwSize = 0;
+	LSTATUS ret = RegQueryValueEx(hKey, subKey, 0, &dwType, NULL, &dwSize);
+	if (ret != ERROR_SUCCESS) return ret;
+	WCHAR *buffer = new WCHAR[dwSize];
+	ret = RegQueryValueEx(hKey, subKey, 0, &dwType, (LPBYTE)buffer, &dwSize);
+	if (ret != ERROR_SUCCESS) return ret;
+	out = buffer;
+	delete[] buffer;
+	return ERROR_SUCCESS;
+}
+
+LSTATUS MyGetModuleFileName(HMODULE hModule, std::wstring &out)
+{
+	DWORD res, size = MAX_PATH;
+	out = wstring();
+	out.resize(size);
+	while ((res = GetModuleFileName(hModule, &out[0], size)) == size)
+	{
+		out.resize(size += MAX_PATH);
+	}
+	if (res == 0)
+		return GetLastError();
+	else
+	{
+		out.resize(size - MAX_PATH + res);
+		return ERROR_SUCCESS;
+	}
+}
+
+LSTATUS MyGetEnvironmentVariable(LPCWSTR name, std::wstring & out)
+{
+	DWORD res, size = MAX_PATH;
+	out = wstring();
+	out.resize(size);
+	while ((res = GetEnvironmentVariable(name, &out[0], size)) == size)
+	{
+		out.resize(size += MAX_PATH);
+	}
+	if (res == 0)
+		return GetLastError();
+	else
+	{
+		out.resize(size - MAX_PATH + res);
+		return ERROR_SUCCESS;
+	}
+}
+
+bool MyCreateProcess(const std::wstring &command)
+{
+	wstring writable_command = command;
+	STARTUPINFO si;
+	PROCESS_INFORMATION pi;
+	si.cb = sizeof(si);
+	ZeroMemory(&si, sizeof(si));
+	ZeroMemory(&pi, sizeof(pi));
+
+	return (CreateProcess(NULL, &writable_command[0], NULL, NULL, false, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi));
+}
+
+bool FindFirstFileExists(LPCWSTR lpPath, DWORD dwFilter)
+{
+	WIN32_FIND_DATA fd;
+	HANDLE hFind = FindFirstFile(lpPath, &fd);
+	bool bFilter = (false == dwFilter) ? true : fd.dwFileAttributes & dwFilter;
+	bool ret = ((hFind != INVALID_HANDLE_VALUE) && bFilter) ? true : false;
+	FindClose(hFind);
+	return ret;
+}
+
+bool GetArch(bool & is64Bit)
+{
+#if _WIN64
+	isWindows64bit = true;
+	return true;
+#elif _WIN32
+	typedef BOOL(WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
+
+	BOOL isWow64 = FALSE;
+
+	// IsWow64Process is not available on all supported versions of Windows.
+	// Use GetModuleHandle to get a handle to the DLL that contains the function
+	// and GetProcAddress to get a pointer to the function if available.
+
+	LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)
+		GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");
+
+	if (fnIsWow64Process)
+	{
+		if (!fnIsWow64Process(GetCurrentProcess(), &isWow64))
+			return false;
+
+		is64Bit = isWow64;
+		return true;
+	}
+	else // IsWow64Process is not supported, fail to detect.
+		return false;
+
+#else
+#error _WIN64 and _WIN32 are both undefined.
+#endif
+}