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Chapter 4 Windows 3.1 Compiler/Linker Issues
©
National Instruments Corporation 4-23 LabWindows/CVI Programmer Reference Manual
DLL Search Precedence
LabWindows/CVI finds a DLL file in the following ways for Windows 3.1:
•If the
.dll file is associated with a .fp file, LabWindows/CVI uses the following search
precedence to find the DLL.
1. If a
.pth file with the same full path name as the .fp file is in the project,
LabWindows/CVI uses the standard Windows DLL search algorithm. The
.pth
file must contain the name of the
.dll file, such as mystuff.dll. It must
contain an absolute path or a simple filename.
2. If a
.dll file with the same full path name as the .fp file is in the project,
LabWindows/CVI uses the absolute path of the
.dll file in the project to load
the
.dll file.
3. If a
.pth file with the same base name as the .fp file is in the same directory as
the
.fp file and a .lib or .obj file of the same base name does not exist in the
same directory, LabWindows/CVI uses the standard Windows DLL search
algorithm. The
.pth file must contain the name of the .dll file, such as
mystuff.dll. It must not contain any directory names or slashes.
4. If a
.dll file with the same base name as the .fp file is in the same directory as
the
.fp file, LabWindows/CVI loads the .dll file as long as no .lib, .obj,
or
.pth file of the same base name appears in the same directory.
5. If a
.pth or .dll file does not appear in the same directory as the .fp file,
LabWindows/CVI uses the standard Windows search algorithm to look for a
DLL with the same base name as the
.fp file. Thus, if a DLL with the same base
name is in the
windows or windows\system directory or a directory listed in
your
PATH environment variable, LabWindows/CVI finds it.
DLLs for VXIplug&play drivers are not in the same directory as the
.fp files, but the
directory that contains the DLL is listed in the
PATH environment variable. Therefore,
Step 5 makes it easier for you to use VXIplug&play instrument driver DLLs in
LabWindows/CVI for Windows 3.1.
•If the
.dll file is not associated with a .fp file, LabWindows/CVI uses the following
search precedence to find the DLL:
1. If a
.pth file is in the project list, LabWindows/CVI uses the standard Windows
DLL search algorithm. The
.pth file must contain the name of the .dll file,
such as
mystuff.dll. It must contain an absolute path or a simple filename.
2. If the
.dll file is in the project list, then LabWindows/CVI uses the absolute
pathname to find the
.dll file.
00ProRef.book : 06chap04.fm Page 23 Monday, March 9, 1998 3:23 PM