The 16-bit DLL entry procedure, LibMain, is defined as follows:

int PASCAL LibMain(HINSTANCE hInstance, uint16 wDataSeg,

LibMain, HINSTANCE, uint16, and LPSTR are defined in windows.h. The parameters are described in the following table:

Parameter	Description
hInstance	instance handle of the DLL.
wDataSeg	value of the data segment (DS) register.
cbHeapSize	size of the local heap specified in the module definition file for the DLL.
lpCmdLine	far pointer to the command line specified when the DLL was loaded. This is almost always null, because typically DLLs are loaded automatically without parameters. It is possible, however, to supply a command line to a DLL when it is loaded explicitly.

The return value for LibMain is either 1 (successful initialization) or 0 (unsuccessful initialization). Windows unloads the DLL from memory if 0 is returned.

See Also