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Removed "you can use LockRect" portion of answer, since this seems clearly wrong.
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edit approved Jan 2, 2014 at 17:06
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edit approved Jan 2, 2014 at 17:06
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You can use LockRect with textures in the default pool under 9Ex.

Other alternatives include using UpdateTexture or UpdateSurface from a D3DPOOL_SYSTEMMEM source.

Under Vista+ (which I assume you're targetting since you're using 9Ex) you can supply the texture data via the pSharedHandle arg to CreateTexture; per the documentation:

In Windows Vista CreateTexture can create a texture from a system memory pointer allowing the application more flexibility over the use, allocation and deletion of the system memory.

Caveat: I haven't done this and can't vouch for it.

You can use LockRect with textures in the default pool under 9Ex.

Other alternatives include using UpdateTexture or UpdateSurface from a D3DPOOL_SYSTEMMEM source.

Under Vista+ (which I assume you're targetting since you're using 9Ex) you can supply the texture data via the pSharedHandle arg to CreateTexture; per the documentation:

In Windows Vista CreateTexture can create a texture from a system memory pointer allowing the application more flexibility over the use, allocation and deletion of the system memory.

Caveat: I haven't done this and can't vouch for it.

Other alternatives include using UpdateTexture or UpdateSurface from a D3DPOOL_SYSTEMMEM source.

Under Vista+ (which I assume you're targetting since you're using 9Ex) you can supply the texture data via the pSharedHandle arg to CreateTexture; per the documentation:

In Windows Vista CreateTexture can create a texture from a system memory pointer allowing the application more flexibility over the use, allocation and deletion of the system memory.

Caveat: I haven't done this and can't vouch for it.

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Maximus Minimus
Maximus Minimus
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You can use LockRect with textures in the default pool under 9Ex.

Other alternatives include using UpdateTexture or UpdateSurface from a D3DPOOL_SYSTEMMEM source.

Under Vista+ (which I assume you're targetting since you're using 9Ex) you can supply the texture data via the pSharedHandle arg to CreateTexture; per the documentation:

In Windows Vista CreateTexture can create a texture from a system memory pointer allowing the application more flexibility over the use, allocation and deletion of the system memory.

Caveat: I haven't done this and can't vouch for it.