[reactos] 01/01: [DESK] Use MultiByteToWideChar instead of the private pSetupMultiByteToUnicode function (#5765)

[Hermès Bélusca-Maïto]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=ce08851758fa938650fd3…

commit ce08851758fa938650fd3faae7d9b2ef499175e1
Author:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
AuthorDate: Thu Oct 5 22:41:16 2023 +0200
Commit:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
CommitDate: Sat Oct 7 22:17:58 2023 +0200

    [DESK] Use MultiByteToWideChar instead of the private pSetupMultiByteToUnicode
function (#5765)
    
    This avoids having desk.cpl depend on a private function that may change
    or disappear, and increase the probability of being able to use that CPL
    across different Windows versions.
    
    (Note: this pSetupMultiByteToUnicode was one of those whose name changed
    between Windows 2000 and XP+)
---
 dll/cpl/desk/desk.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/dll/cpl/desk/desk.c b/dll/cpl/desk/desk.c
index 7a34e2420b4..0bbfc7a4a0e 100644
--- a/dll/cpl/desk/desk.c
+++ b/dll/cpl/desk/desk.c
@@ -8,8 +8,11 @@
  */
 
 #include "desk.h"
+
 #include <shellapi.h>
 #include <cplext.h>
+#include <winnls.h>
+
 #include <debug.h>
 
 #define NUM_APPLETS    (1)
@@ -364,6 +367,7 @@ InstallScreenSaverA(
     IN UINT nCmdShow)
 {
     LPWSTR lpwString;
+    int nLength;
 
     if (!pszFile)
     {
@@ -371,16 +375,32 @@ InstallScreenSaverA(
         SetLastError(ERROR_INVALID_PARAMETER);
         return;
     }
-    DPRINT("InstallScreenSaver() Install from file %s\n", pszFile);
-    lpwString = pSetupMultiByteToUnicode(pszFile, 0);
+
+    /* Convert the string to unicode */
+    lpwString = NULL;
+    nLength = MultiByteToWideChar(CP_ACP, 0, pszFile, -1, NULL, 0);
+    if (nLength != 0)
+    {
+        lpwString = LocalAlloc(LMEM_FIXED, nLength * sizeof(WCHAR));
+        if (lpwString)
+        {
+            if (!MultiByteToWideChar(CP_ACP, 0, pszFile, -1, lpwString, nLength))
+            {
+                LocalFree(lpwString);
+                lpwString = NULL;
+            }
+        }
+    }
     if (!lpwString)
     {
         DPRINT("InstallScreenSaver() not enough memory to convert string to
unicode\n");
-        SetLastError(ERROR_NOT_ENOUGH_MEMORY);
         return;
     }
+
+    /* Call the unicode function */
     InstallScreenSaverW(hWindow, hInstance, lpwString, nCmdShow);
-    MyFree(lpwString);
+
+    LocalFree(lpwString);
 }
 
 BOOL WINAPI