正確にパスを取得するには？ (ID：54455)

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ソースはこんな感じです↓。

#include <windows.h>

#pragma comment(lib, "winmm.lib")    // winmm.libをリンク

#define WS_NORESIZE		WS_OVERLAPPED | WS_MINIMIZEBOX | WS_CAPTION | WS_SYSMENU

/* 変数宣言 */
int Width = 640;
int Height = 480;
LPSTR lpFileName;  //ファイル名

MCI_OPEN_PARMS Mop;
MCIERROR mciErr;
TCHAR mciErrStr[512];

/* プロトタイプ宣言 */
LRESULT CALLBACK  WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	HWND hWnd;
	MSG Msg;
	WNDCLASS Wc;

lpFileName = lpCmdLine;	//ファイル名の取得

ZeroMemory(&Wc, sizeof (WNDCLASS));

Wc.cbClsExtra = 0;
	Wc.cbWndExtra = 0;
	Wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
	Wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	Wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	Wc.lpfnWndProc = (WNDPROC)WindowProc;
	Wc.lpszClassName = TEXT("Form");
	Wc.lpszMenuName = NULL;
	Wc.style = CS_HREDRAW | CS_VREDRAW;

if (RegisterClass(&Wc) == 0) return -1;

hWnd = CreateWindowEx(WS_EX_CONTROLPARENT | WS_EX_WINDOWEDGE, TEXT("Form"),
			TEXT("Caption"), WS_NORESIZE, 0, 0,
			Width, Height, NULL, NULL, hInstance, NULL);

if (hWnd == NULL) return -1;

ShowWindow(hWnd, SW_SHOW);

while (GetMessage(&Msg, NULL, 0, 0))
	{
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}

return Msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wPalam, LPARAM lParam)
{
	switch (uMsg)
	{
	case WM_CREATE:
		ZeroMemory(&Mop, sizeof (MCI_OPEN_PARMS));

Mop.dwCallback = (DWORD)hWnd;
		Mop.lpstrAlias = NULL;
		Mop.lpstrDeviceType = (LPCSTR)MCI_DEVTYPE_WAVEFORM_AUDIO;
		Mop.lpstrElementName = lpFileName;

mciErr = mciSendCommand(0, MCI_OPEN, MCI_OPEN_TYPE |
					MCI_OPEN_TYPE_ID | MCI_OPEN_ELEMENT, (DWORD)&Mop);
		if (mciErr)
		{
			mciGetErrorString(mciErr, mciErrStr, 512);
			MessageBox(hWnd, mciErrStr, NULL, MB_OK | MB_ICONERROR);
		}
		else
			mciSendCommand(Mop.wDeviceID, MCI_PLAY, 0, 0);
		break;
	case WM_DESTROY:
		mciSendCommand(Mop.wDeviceID, MCI_CLOSE, 0, 0);
		PostQuitMessage(0);
		break;
	default:
		return (DefWindowProc(hWnd, uMsg, wPalam, lParam));
	}

return 0;
}

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