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#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <msiquery.h>
#include <wcautil.h>
#define GUID_BUFFER_SIZE 39 // {8-4-4-4-12}\0
UINT WINAPI SetInstallScope(MSIHANDLE hInstall) {
HRESULT hr = S_OK;
UINT er = ERROR_SUCCESS;
TCHAR upgrade_code[GUID_BUFFER_SIZE];
DWORD upgrade_code_len = GUID_BUFFER_SIZE;
DWORD iProductIndex;
TCHAR product_code[GUID_BUFFER_SIZE];
TCHAR assignment_type[2];
DWORD assignment_type_len = 2;
hr = WcaInitialize(hInstall, "SetInstallScope");
ExitOnFailure(hr, "Failed to initialize");
er = MsiGetProperty(hInstall, TEXT("UpgradeCode"), upgrade_code,
&upgrade_code_len);
ExitOnWin32Error(er, hr, "Failed to get UpgradeCode property");
for (iProductIndex = 0;; iProductIndex++) {
er = MsiEnumRelatedProducts(upgrade_code, 0, iProductIndex, product_code);
if (er == ERROR_NO_MORE_ITEMS) break;
ExitOnWin32Error(er, hr, "Failed to get related product code");
er = MsiGetProductInfo(product_code, INSTALLPROPERTY_ASSIGNMENTTYPE,
assignment_type, &assignment_type_len);
ExitOnWin32Error(er, hr, "Failed to get the assignment type property "
"from related product");
// '0' = per-user; '1' = per-machine
if (assignment_type[0] == '0') {
/* When old versions which were installed as per-user are detected, the
* installation scope has to be set to per-user to be able to do an
* upgrade. If not, two versions will be installed side-by-side: one as
* per-user and the other as per-machine.
*
* If we wanted to disable backward compatibility, the installer should
* abort here, and request the previous version to be manually
* uninstalled before installing this one.
*/
er = MsiSetProperty(hInstall, TEXT("ALLUSERS"), TEXT(""));
ExitOnWin32Error(er, hr, "Failed to set the install scope to per-user");
break;
}
}
LExit:
return WcaFinalize(ERROR_SUCCESS);
}
UINT WINAPI BroadcastEnvironmentUpdate(MSIHANDLE hInstall) {
HRESULT hr = S_OK;
UINT er = ERROR_SUCCESS;
hr = WcaInitialize(hInstall, "BroadcastEnvironmentUpdate");
ExitOnFailure(hr, "Failed to initialize");
SendMessageTimeoutW(HWND_BROADCAST,
WM_SETTINGCHANGE,
0,
(LPARAM) L"Environment",
SMTO_ABORTIFHUNG,
5000,
NULL);
LExit:
er = SUCCEEDED(hr) ? ERROR_SUCCESS : ERROR_INSTALL_FAILURE;
return WcaFinalize(er);
}
BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ulReason, VOID* dummy) {
switch (ulReason) {
case DLL_PROCESS_ATTACH:
WcaGlobalInitialize(hInst);
break;
case DLL_PROCESS_DETACH:
WcaGlobalFinalize();
break;
}
return TRUE;
}
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