Checking if a Product Is Installed
InstallShield 2020 Express Edition
The following code will check if a product with a ProductCode of {8FC71000-88A0-4B41-82B8-8905D4AA904C} is installed on the machine. This code can be used as a New Style DLL Custom Action.
UINT __stdcall CheckProduct(MSIHANDLE hInstall)
{
int RetVal = 0;
RetVal = MsiQueryProductState("{8FC71000-88A0-4B41-82B8-8905D4AA904C}");
if (RetVal==5))
{
MessageBox(GetForegroundWindow(),TEXT("Installed"),TEXT("My Product"), MB_OK);
return 1;
}
else
{
MessageBox(GetForegroundWindow(),TEXT("Not Installed"),TEXT("My Product"), MB_OK);
return 0;
}
}
The following table lists the return values of MsiQueryProductState:
|
Return Value |
Description |
|
–1 |
The product is neither advertised nor installed. |
|
1 |
The product is advertised but not installed. |
|
2 |
The product is installed for a different user. |
|
5 |
The product is installed for the current user. |