//Note: I do check all function return values and everything goes fine
//      up until the call to IDirectSound8::CreateSoundBuffer()
LPDIRECTSOUND8 lpds = 0;
LPDIRECTSOUNDBUFFER lpdsb = 0;
DSBUFFERDESC dsbd;
WAVEFORMATEX wfmt;
HWND hWnd; //The application window handle, created elsewhere

//Create the DirectSound8 object and set the cooperative level
DirectSoundCreate8(0, &lpds, 0);
lpds->SetCooperativeLevel(hWnd, DSSCL_EXCLUSIVE);

//Here I call a function that uses winmm.lib functions (mmio*)
//to load a wav file into memory, everything works fine here
//and dsbd and wfmt are filled with information describing the
//loaded file.
LoadWavFile("w1.wav", &dsbd, &wfmt);

/*
dsbd now contains the following data
    dwSize = 36
    dwFlags = DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME
    dwBufferBytes = 1976
    dwReserved = 0
    lpwfxFormat = &wfmt
    guid3DAlgorithm = GUID_NULL

wfmt now contains the following data
    wFormatTag = 85
    nChannels = 1
    nSamplesPerSec = 11025
    nAvgBytesPerSec = 2000
    nBlockAlign = 1
    wBitsPerSample = 0
    cbSize = 12
*/

//Create the LPDIRECTSOUNDBUFFER object - Code fails here
//and returns DSERR_INVALIDCALL
lpds->CreateSoundBuffer(&dsbd, &lpdsb, 0);

'Test.exe': Loaded 'C:\C++\Test\Debug\Test.exe', Symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\user32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\gdi32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\dsound.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\msvcrt.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\advapi32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\rpcrt4.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\ole32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\winmm.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\version.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\imm32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\lpk.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\usp10.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\uxtheme.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\MSCTFIME.IME', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\wdmaud.drv', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\wintrust.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\crypt32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\msasn1.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\imagehlp.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Unloaded 'C:\WINDOWS\system32\wdmaud.drv''Test.exe': Loaded 'C:\WINDOWS\system32\wdmaud.drv', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Loaded 'C:\WINDOWS\system32\msacm32.drv', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\msacm32.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\midimap.dll', No symbols loaded.'Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Loaded 'C:\WINDOWS\system32\setupapi.dll', No symbols loaded.'Test.exe': Unloaded 'C:\WINDOWS\system32\setupapi.dll''Test.exe': Loaded 'C:\WINDOWS\system32\ksuser.dll', No symbols loaded.The thread 'Win32 Thread' (0x8f4) has exited with code 0 (0x0).The thread 'Win32 Thread' (0xf0c) has exited with code 0 (0x0).The thread 'Win32 Thread' (0xa90) has exited with code 0 (0x0).The program '[2548] Test.exe: Native' has exited with code 0 (0x0).

#pragma comment(lib, "dsound.lib")#include <dsound.h>#include <sstream>LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam){	if(msg == WM_DESTROY)	{		PostQuitMessage(0);		return 0;	}	else	{		return DefWindowProc(hwnd, msg, wParam, lParam);	}}int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){	//-----------------	// Create the window	//-----------------	WNDCLASSEX wc;	HWND hwnd;	wc.cbClsExtra = 0;	wc.cbSize = sizeof(WNDCLASSEX);	wc.cbWndExtra = 0;	wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);	wc.hCursor = LoadCursor(0, IDC_ARROW);	wc.hIcon = LoadIcon(0, IDI_APPLICATION);	wc.hIconSm = LoadIcon(0, IDI_APPLICATION);	wc.hInstance = GetModuleHandle(0);	wc.lpfnWndProc = WinProc;	wc.lpszClassName = "DSTEST";	wc.lpszMenuName = 0;	wc.style = CS_OWNDC;	if(!RegisterClassEx(&wc))	{		return 0;	}	hwnd = CreateWindowEx(0, "DSTEST", "DirectSound Test",                              WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT,                              CW_USEDEFAULT, 400, 400, 0, 0, GetModuleHandle(0), 0);	if(!hwnd)	{		return 0;	}	//-----------------	// Minimal DS Create Buffer test	//-----------------	LPDIRECTSOUND8 lpds = 0;	LPDIRECTSOUNDBUFFER lpdsb = 0;	DSBUFFERDESC dsbd;	WAVEFORMATEX wfmt;	if(FAILED(DirectSoundCreate8(0, &lpds, 0))	{		return 0;	}	if(FAILED(lpds->SetCooperativeLevel(hwnd, DSSCL_NORMAL))	{		return 0;	}	dsbd.dwSize = 36;	dsbd.dwFlags = 0;	dsbd.dwBufferBytes = 1976;	dsbd.dwReserved = 0;	dsbd.lpwfxFormat = &wfmt;	dsbd.guid3DAlgorithm = GUID_NULL;	wfmt.wFormatTag = 85;	wfmt.nChannels = 1;	wfmt.nSamplesPerSec = 11025;	wfmt.nAvgBytesPerSec = 2000;	wfmt.nBlockAlign = 1;	wfmt.wBitsPerSample = 0;	wfmt.cbSize = 0;	HRESULT hr = lpds->CreateSoundBuffer(&dsbd, &lpdsb, 0);	if(FAILED(hr))	{		std::stringstream ss;		ss<<"Error creating sound buffer: "<<hr;		MessageBox(hwnd, ss.str().c_str(), "Error", MB_OK);		lpds->Release();		DestroyWindow(hwnd);		return 0;	}	MessageBox(hwnd, "Sound buffer created successfully.", "Error", MB_OK);	lpdsb->Release();	lpds->Release();	DestroyWindow(hwnd);	return 0;}