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Specifying the KMDF Co-installer in an INF File

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Note

If your driver only targets Windows 10, you do not need to redistribute WDF or provide a Coinstaller in your driver package. To target Windows 10:

  1. In Visual Studio, in the Project Settings property page, under Driver Settings -> Target OS Version, select Windows 10 or higher. This is equivalent to adding the following to the .vcxproj file:
<PropertyGroup Label="Configuration">
<TargetVersion>Windows10</TargetVersion>
  1. In the INF Manufacturer Section, specify 10.0 as target OS version, as follows:
[Manufacturer]
%MyMfg% = MyMfg, NTamd64.10.0

If you include a co-installer in your driver package, read this topic for information about sections you must provide in your driver's INF file. This information does not apply if you provide your own setup application that calls Microsoft-supplied .msu redistributables.

INF File Sections for the Co-installer

Your driver's INF file must contain an INF DDInstall.CoInstallers section that installs the co-installer. For example this section might be named MyDevice.ntx86.CoInstallers. For more information about specifying a co-installer in an INF file, see INF DDInstall.CoInstallers Section.

In addition, your driver's INF file must contain an INF DDInstall.Wdf section that the co-installer reads after it has been installed. For example, this section might be named MyDevice.ntx86.Wdf. After the framework's co-installer has been installed, it reads this section while it is installing your driver.

The INF DDInstall.Wdf section contains the following directive:

  • KmdfService = DriverService,Wdf-install-section

DriverService represents the name that the operating system will assign to your driver's kernel-mode service, and Wdf-install-section represents the name of an INF section that the co-installer reads to obtain information about your driver.

The INF section that Wdf-install-section identifies must contain the following directive:

  • KmdfLibraryVersion = WdfLibraryVersion

WdfLibraryVersion represents a library version number, such as "1.0" or "1.11".

For example, the following INF DDInstall.Wdf section specifies Echo_wdfsect as the Wdf-install-section name.

[ECHO_Device.NT.Wdf]
KmdfService = Echo, Echo_wdfsect
[Echo_wdfsect]
KmdfLibraryVersion = 1.0

You can avoid creating multiple INF files for multiple versions of the framework by using INX files and the Stampinf tool. For more information about INX files, see Using INX Files to Create INF Files.

Sample INF DDInstall.CoInstallers and DDInstall.Wdf Sections

The following code example shows how to create the INF DDInstall.CoInstallers section and INF DDInstall.Wdf section of an INF file for a PnP driver. The example shows how to create an INF file that is called MyDevice.inf and is based on the ECHO sample driver's Echo.inf file. The Echo sample driver is located in the samples directory of the WDK.

To create MyDevice.inf, you must change all ECHO_Device substrings in Echo.inf to a name that is appropriate for your product. The following code example uses MyDevice.

You should attempt to match the section layout that the Echo.inf sample uses. In other words, if possible, keep the co-installer-related sections together to more easily spot cut-and-paste errors.

Before you have modified echo.inf, the sections that install the co-installer are as follows:

=============== Top of Echo.inf ====================
....
....
[DestinationDirs]
DefaultDestDir = 12
ECHO_Device_CoInstaller_CopyFiles = 11
....
....
;
;--- ECHO_Device Co-installer installation ------
;
[ECHO_Device.NT.CoInstallers]
AddReg=ECHO_Device_CoInstaller_AddReg
CopyFiles=ECHO_Device_CoInstaller_CopyFiles

[ECHO_Device_CoInstaller_AddReg]
HKR,,CoInstallers32,0x00010000, "WdfCoInstaller01000.dll,WdfCoInstaller"

[ECHO_Device_CoInstaller_CopyFiles]
WdfCoInstaller01000.dll

[ECHO_Device.NT.Wdf]
KmdfService = Echo, Echo_wdfsect
[Echo_wdfsect]
KmdfLibraryVersion = 1.0

===============  End of Echo.inf ===============

After you have changed all ECHO_Device substrings, your MyDevice.inf file should appear as follows:

=============== Top of MyDevice.inf ===============
....
....
[DestinationDirs]
DefaultDestDir = 12
MyDevice_CoInstaller_CopyFiles = 11
....
....
;
;--- MyDevice Co-installer installation ------
;
[MyDevice.NT.CoInstallers]
AddReg=MyDevice_CoInstaller_AddReg
CopyFiles=MyDevice_CoInstaller_CopyFiles

[MyDevice_CoInstaller_AddReg]
HKR,,CoInstallers32,0x00010000, "WdfCoInstaller01000.dll,WdfCoInstaller"

[MyDevice_CoInstaller_CopyFiles]
WdfCoInstaller01000.dll

[MyDevice.NT.Wdf]
KmdfService = MyDevice, MyDevice_wdfsect
[MyDevice_wdfsect]
KmdfLibraryVersion = 1.0
....
....
=============== End of MyDevice.inf ===============