beastpatcher: check WMP version.

The current implementation fails silently if Windows Media Player is version
10. Add a check and inform the user if the version installed is too old to work
properly with beastpatcher.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30864 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 53 insertions, 0 deletions

diff --git a/utils/MTP/beastpatcher/main.c b/utils/MTP/beastpatcher/main.c
index 97d931e454..219433456b 100644
--- a/utils/MTP/beastpatcher/main.c
+++ b/utils/MTP/beastpatcher/main.c
@@ -104,6 +104,13 @@ int main(int argc, char* argv[])
     if(argc > 1) {
         interactive = 0;
     }
+#if defined(__WIN32__) || defined(_WIN32)
+    if(mtp_wmp_version() < 11) {
+        fprintf(stderr, "beastpacher requires at least Windows Media Player 11 to run!\n");
+        fprintf(stderr, "Please update you installation of Windows Media Player.\n");
+        return -1;
+    }
+#endif
 
     i = 1;
     while(i < argc) {
diff --git a/utils/MTP/beastpatcher/mtp_common.h b/utils/MTP/beastpatcher/mtp_common.h
index 2ca87c7509..8cd261416c 100644
--- a/utils/MTP/beastpatcher/mtp_common.h
+++ b/utils/MTP/beastpatcher/mtp_common.h
@@ -59,6 +59,10 @@ struct mtp_info_t
 #endif
 };
 
+#if defined(__WIN32__) || defined(_WIN32)
+int mtp_wmp_version(void);
+#endif
+
 /* Common functions for both libMTP and win32 */
 
 int mtp_init(struct mtp_info_t* mtp_info);
diff --git a/utils/MTP/beastpatcher/mtp_win32.c b/utils/MTP/beastpatcher/mtp_win32.c
index 15d0d705e2..626467ecbe 100644
--- a/utils/MTP/beastpatcher/mtp_win32.c
+++ b/utils/MTP/beastpatcher/mtp_win32.c
@@ -230,3 +230,45 @@ static int filesize(const char* filename)
     return sb.st_size;
 }
 
+/* Retrieve version of WMP as described in
+ * http://msdn.microsoft.com/en-us/library/dd562731%28VS.85%29.aspx
+ * Since we're after MTP support checking for the WMP6 key is not necessary.
+ */
+int mtp_wmp_version(void)
+{
+    DWORD ret;
+    HKEY hk;
+    DWORD type;
+    DWORD enable = -1;
+    DWORD enablelen = sizeof(DWORD);
+    char buf[32];
+    DWORD buflen = sizeof(buf);
+    int version = 0;
+
+    ret = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
+        "SOFTWARE\\Microsoft\\Active Setup\\Installed Components\\{6BF52A52-394A-11d3-B153-00C04F79FAA6}",
+        0, KEY_QUERY_VALUE, &hk);
+
+    if(ret != ERROR_SUCCESS) {
+        return 0;
+    }
+    type = REG_DWORD;
+    ret = RegQueryValueExA(hk, "IsInstalled", NULL, &type, (LPBYTE)&enable, &enablelen);
+    if(ret != ERROR_SUCCESS) {
+        RegCloseKey(hk);
+        return 0;
+    }
+    if(enable) {
+        type = REG_SZ;
+        ret = RegQueryValueExA(hk, "Version", NULL, &type, (LPBYTE)buf, &buflen);
+    }
+    if(ret == ERROR_SUCCESS) {
+        /* get major version from registry value */
+        buf[31] = '\0';
+        version = atoi(buf);
+    }
+    RegCloseKey(hk);
+
+    return version;
+}
+