add progId generator and example

wfassoc/wfassoc.c

@@ -1,10 +1,26 @@
 #include "wfassoc.h"
 #include <strsafe.h>
 
+// private function and variable declearions.
+
+/// <summary>
+/// Convert multi byte string to wide char string
+/// Notice: this function will allocate memory for returns and it should be released safely.
+/// </summary>
+/// <param name="source">The string will be converted</param>
+/// <param name="error">The error happend during converting</param>
+/// <returns>The string has been converted. If return NULL, it mean that the converting failed.</returns>
+WCHAR* ConvMultiByteToWideChar(CHAR* source);
+
 #define LEGACY_PROGID_FORMATA "%s.%s.%d"
 #define LEGACY_PROGID_FORMATW L"%s.%s.%d"
+#define SAFE_FREE(obj) if(obj!=NULL)free(obj);
+
+// public function implements.
 
 WFERROR WFInstallApplicationW(WFAPP_PROFILEW* profile) {
+	if (profile->WFVersion != WFVERSION) return WFERROR_INVALID_VERSION;
+
 	return WFERROR_OK;
 }
 
@@ -13,6 +29,8 @@ WFERROR WFInstallApplicationA(WFAPP_PROFILEA* profile) {
 }
 
 WFERROR WFUninstallApplicationW(WFAPP_PROFILEW* profile) {
+	if (profile->WFVersion != WFVERSION) return WFERROR_INVALID_VERSION;
+
 	return WFERROR_OK;
 }
 
@@ -41,3 +59,27 @@ WFERROR WFGenerateProgIDA(CHAR* vendor, CHAR* component, INT version, CHAR* resu
 	}
 	return WFERROR_OK;
 }
+
+
+// private function and variable implements.
+
+WCHAR* ConvMultiByteToWideChar(CHAR* source) {
+	WCHAR* dest = NULL;
+	size_t sourceLength = strlen(source);
+
+	int destLength = MultiByteToWideChar(CP_ACP, 0, source, sourceLength, NULL, 0);
+	if (destLength <= 0) return NULL;
+	destLength += 10;
+
+	dest = (WCHAR*)malloc(sizeof(WCHAR) * destLength);
+	if (dest == NULL) return NULL;
+
+	memset(dest, 0, sizeof(WCHAR) * destLength);
+	int error = MultiByteToWideChar(CP_ACP, 0, source, sourceLength, dest, destLength);
+	if (error <= 0) {
+		free(dest);
+		return NULL;
+	}
+
+	return dest;
+}