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#include <windows.h>
#include <msi.h>
#include <msiquery.h>
#include <string>
#include <vector>
std::wstring get_property(MSIHANDLE msi_handle, std::wstring const& name)
{
DWORD size = 0;
UINT status = MsiGetPropertyW(msi_handle, name.c_str(), L"", &size);
if(status == ERROR_MORE_DATA)
{
std::vector<wchar_t> buffer(size + 1);
MsiGetPropertyW(msi_handle, name.c_str(), &buffer[0], &size);
return std::wstring(&buffer[0]);
}
else
{
return std::wstring();
}
}
void set_property(MSIHANDLE msi_handle,
std::wstring const& name, std::wstring const& value)
{
MsiSetPropertyW(msi_handle, name.c_str(), value.c_str());
}
extern "C" UINT __stdcall DetectNsisOverwrite(MSIHANDLE msi_handle)
{
std::wstring install_root = get_property(msi_handle, L"INSTALL_ROOT");
std::wstring uninstall_exe = install_root + L"\\uninstall.exe";
bool uninstall_exe_exists =
GetFileAttributesW(uninstall_exe.c_str()) != INVALID_FILE_ATTRIBUTES;
set_property(msi_handle, L"CMAKE_NSIS_OVERWRITE_DETECTED",
uninstall_exe_exists ? L"1" : L"0");
return ERROR_SUCCESS;
}
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