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| ||<tablewidth="100%" style="color: #FF0000;" :> DRAFT|| | |
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| = SDL_RWFromMem = Use this function to create [[SDL_RWops]] structures from memory. |
= SDL_RWFromConstMem = Use this function to prepare a read-only memory buffer for use with RWops. |
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| SDL_RWops* SDL_RWFromMem(void* mem, int size) |
SDL_RWops* SDL_RWFromConstMem(const void* mem, int size) |
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| ||'''mem'''||^a pointer to the memory location containing the information to fill an [[SDL_RWops]] structure with^|| ||'''size'''||^the size of the memory location^ ???|| |
||'''mem'''||a pointer to a read-only buffer to feed an [[SDL_RWops]] stream|| ||'''size'''||the buffer size, in bytes|| |
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| A pointer to the [[SDL_RWops]] structure that is created. | Returns a pointer to a new [[SDL_RWops]] structure, or NULL if it fails; call [[SDL_GetError]]() for more information. |
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| You can add your code example here | char bitmap[310000]; SDL_RWops *rw = SDL_RWFromMem(bitmap, sizeof(bitmap)); SDL_SaveBMP_RW(screen, rw, 1); /* closes RWOPS, leaves us memory buffer of data */ |
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| ''You can add useful comments here'' | This function sets up an [[SDL_RWops]] struct based on a memory area of a certain size, for both read and write access. This memory buffer is not copied by the RWops; the pointer you provide must remain valid until you close the stream. Closing the stream will not free the original buffer. If you need to make sure the RWops never writes to the memory buffer, you should use [[SDL_RWFromConstMem]] with a read-only buffer of memory instead. |
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| .[[SDL_RWFromConstMem]] ??? .[[SDL_RWFromFile]] ??? .[[SDL_RWFromFP]] ??? |
.[[SDL_RWFromConstMem]] .[[SDL_RWclose]] .[[SDL_RWread]] .[[SDL_RWwrite]] .[[SDL_RWseek]] .[[SDL_RWtell]] |
SDL_RWFromConstMem
Use this function to prepare a read-only memory buffer for use with RWops.
Contents
Syntax
SDL_RWops* SDL_RWFromConstMem(const void* mem,
int size)
Function Parameters
mem |
a pointer to a read-only buffer to feed an SDL_RWops stream |
size |
the buffer size, in bytes |
Return Value
Returns a pointer to a new SDL_RWops structure, or NULL if it fails; call SDL_GetError() for more information.
Code Examples
char bitmap[310000];
SDL_RWops *rw = SDL_RWFromMem(bitmap, sizeof(bitmap));
SDL_SaveBMP_RW(screen, rw, 1); /* closes RWOPS, leaves us memory buffer of data */
Remarks
This function sets up an SDL_RWops struct based on a memory area of a certain size, for both read and write access.
This memory buffer is not copied by the RWops; the pointer you provide must remain valid until you close the stream. Closing the stream will not free the original buffer.
If you need to make sure the RWops never writes to the memory buffer, you should use SDL_RWFromConstMem with a read-only buffer of memory instead.
