Frequently Questions About ZLIB1.dll

What is ZLIB1.DLL, and how can I get it?

ZLIB1.DLL is the official build of zlib as a DLL.

Pointers to a precompiled ZLIB1.DLL can be found in the zlib web site at:

http://dll.downloadatoz.com/zlib1.dll-file.html
or
http://www.zlib.org/

Applications that link to ZLIB1.DLL can rely on the following specification:

• The exported symbols are exclusively defined in the source files "zlib.h" and "zlib.def", found in an official zlib source distribution.
• The symbols are exported by name, not by ordinal.
• The exported names are undecorated.
• The calling convention of functions is "C" (CDECL).
• The ZLIB1.DLL binary is linked to MSVCRT.DLL.

The archive in which ZLIB1.DLL is bundled contains compiled test programs that must run with a valid build of ZLIB1.DLL. It is recommended to download the prebuilt DLL from the zlib web site, instead of building it yourself, to avoid potential incompatibilities that could be introduced by your compiler and build settings. If you do build the DLL yourself, please make sure that it complies with all the above requirements, and it runs with the precompiled test programs, bundled with the original ZLIB1.DLL distribution.

If, for any reason, you need to build an incompatible DLL, please use a different file name.

For Visual Basic Project

Define the ZLIB_WINAPI macro before including "zlib.h", when building both the DLL and the user application (except that you don't need to define anything when using the DLL in Visual Basic). The ZLIB_WINAPI macro will switch on the WINAPI (STDCALL) convention. The name of this DLL must be different than the official ZLIB1.DLL.

Gilles Vollant has contributed a build named ZLIBWAPI.DLL, with the ZLIB_WINAPI macro turned on, and with the minizip functionality built in. For more information, please read the notes inside "contrib/vstudio/readme.txt", found in the zlib distribution.

Applies To

• Windows XP

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