c++ check installed programms - windows

Question

How do I list all programs installed on my computer? I've tried using the MsiEnumProducts and MsiGetProductInfo functions, but they do not return a full list of installed applications like I see in "Add/Remove Programs".

Answer 1

Enumerate the registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
bool EnumInstalledSoftware(void)
{
HKEY hUninstKey = NULL;
HKEY hAppKey = NULL;
WCHAR sAppKeyName[1024];
WCHAR sSubKey[1024];
WCHAR sDisplayName[1024];
WCHAR *sRoot = L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
long lResult = ERROR_SUCCESS;
DWORD dwType = KEY_ALL_ACCESS;
DWORD dwBufferSize = 0;
//Open the "Uninstall" key.
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, sRoot, 0, KEY_READ, &hUninstKey) != ERROR_SUCCESS)
{
return false;
}
for(DWORD dwIndex = 0; lResult == ERROR_SUCCESS; dwIndex++)
{
//Enumerate all sub keys...
dwBufferSize = sizeof(sAppKeyName);
if((lResult = RegEnumKeyEx(hUninstKey, dwIndex, sAppKeyName,
&dwBufferSize, NULL, NULL, NULL, NULL)) == ERROR_SUCCESS)
{
//Open the sub key.
wsprintf(sSubKey, L"%s\\%s", sRoot, sAppKeyName);
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, sSubKey, 0, KEY_READ, &hAppKey) != ERROR_SUCCESS)
{
RegCloseKey(hAppKey);
RegCloseKey(hUninstKey);
return false;
}
//Get the display name value from the application's sub key.
dwBufferSize = sizeof(sDisplayName);
if(RegQueryValueEx(hAppKey, L"DisplayName", NULL,
&dwType, (unsigned char*)sDisplayName, &dwBufferSize) == ERROR_SUCCESS)
{
wprintf(L"%s\n", sDisplayName);
}
else{
//Display name value doe not exist, this application was probably uninstalled.
}
RegCloseKey(hAppKey);
}
}
RegCloseKey(hUninstKey);
return true;
}