CAST impossible

salut, je galère sur l'expression suivante :

Code:

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1 2 3 4 5 6 7 8

VOID* pDSLockedBuffer = NULL; BYTE *pCopy;   DXBuf->Lock(m_dwNextWriteOffset, m_dwNotifySize, &pDSLockedBuffer, &dwDSLockedBufferSize, &pDSLockedBuffer2, &dwDSLockedBufferSize2, 0L ) ) )   pCopy = (BYTE*)pDSLockedBuffer[i*512*4];

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pDSLockedBuffer est bien non NULL, en fait il est passé à la fonction lock d'un buffer audio DirectX, pDSLockedBuffer est un pointeur vers une zone valid pour écriture.

mais le compilateur beugle sur cette expression :
error C2036: 'void *' : unknown size
error C2440: 'type cast' : cannot convert from 'void' to 'BYTE *'

je ne comprend pas trop

salut,
normal tu ne peux faire ça:pDSLockedBuffer[i*512*4];
le type etant void le compilateur ne peut indicer ce qui est indefini .
commence par caster le pointeur en byte* avec des parentheses et apres tu indices sur le pointeur obtenu .
:D

Comme cela :

Code:

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pCopy = ((BYTE *)pDSLockedBuffer)[i*512*4];

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parce que la j'ai :

error C2440: '=' : cannot convert from 'BYTE' to 'BYTE *'

pb de déférence ?

Il faut faire ( c'est bien ce qu'il me semblait ) un memcpy

Citation:

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Filling and Playing Static Buffers
A secondary buffer that contains an entire self-contained sound is called a static buffer. Although it is possible to reuse the same buffer for different sounds, typically data is written to a static buffer only once.

Static buffers are created and managed just like streaming buffers. The only difference is in the way they are used: static buffers are filled once and then played, but streaming buffers are constantly refreshed with data as they are playing.

Note A static buffer is not necessarily one created by setting the DSBCAPS_STATIC flag in the buffer description. This flag requests allocation of memory on the sound card, which not available on most modern hardware. A static buffer can exist in system memory and can be created with either the DSBCAPS_LOCHARDWARE or DSBCAPS_LOCSOFTWARE flag. For more information, see Voice Management on ISA and PCI Cards.

Loading data into a static buffer is a three-step process:

Lock the entire buffer by using IDirectSoundBuffer8::Lock. You specify the offset within the buffer where you intend to begin writing (normally 0), and get back the memory address of that point.
Write the audio data to the returned address by using a standard memory-copy routine.
Unlock the buffer using IDirectSoundBuffer8::Unlock.
These steps are shown in the following example, where lpdsbStatic is an IDirectSoundBuffer8 interface pointer and pbData is the address of the data source:

LPVOID lpvWrite;
DWORD dwLength;

if (DS_OK == lpdsbStatic->Lock(
0, // Offset at which to start lock.
0, // Size of lock; ignored because of flag.
&lpvWrite, // Gets address of first part of lock.
&dwLength, // Gets size of first part of lock.
NULL, // Address of wraparound not needed.
NULL, // Size of wraparound not needed.
DSBLOCK_ENTIREBUFFER)) // Flag.
{
memcpy(lpvWrite, pbData, dwLength);
lpdsbStatic->Unlock(
lpvWrite, // Address of lock start.
dwLength, // Size of lock.
NULL, // No wraparound portion.
0); // No wraparound size.
}

To play the buffer, call IDirectSoundBuffer8::Play, as in the following example:

lpdsbStatic->SetCurrentPosition(0);
HRESULT hr = lpdsbStatic->Play(
0, // Unused.
0, // Priority for voice management.
0); // Flags.

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si c'est [] c'est :

Code:

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1 2	pCopy = &((BYTE *)pDSLockedBuffer)[i*512*4];

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:D

merci farscape, sinon oui je fais un memcpy, je n'est pas tout mis le code, juste le nécéssaire pour mon erreur précédente. merci quand même