Use windows API to copy files (#2923)

src/libslic3r/utils.cpp

@@ -852,70 +852,20 @@ CopyFileResult copy_file(const std::string &from, const std::string &to, std::st
     ::MultiByteToWideChar(CP_UTF8, NULL, dest_str, strlen(dest_str), dst_wstr, dst_wlen);
     dst_wstr[dst_wlen] = '\0';
 
-    BOOL result;
-    char* buff = nullptr;
-    HANDLE handlesrc = nullptr;
-    HANDLE handledst = nullptr;
     CopyFileResult ret = SUCCESS;
-
+    BOOL result = CopyFileW(src_wstr, dst_wstr, FALSE);
-    handlesrc = CreateFile(src_wstr,
-        GENERIC_READ,
-        FILE_SHARE_READ,
-        NULL,
-        OPEN_EXISTING,
-        FILE_ATTRIBUTE_TEMPORARY,
-        0);
-    if(handlesrc==INVALID_HANDLE_VALUE){
-        error_message = "Error: open src file";
-        ret = FAIL_COPY_FILE;
-        goto __finished;
-    }
-
-    handledst=CreateFile(dst_wstr,
-        GENERIC_WRITE,
-        FILE_SHARE_READ,
-        NULL,
-        CREATE_ALWAYS,
-        FILE_ATTRIBUTE_TEMPORARY,
-        0);
-    if(handledst==INVALID_HANDLE_VALUE){
-        error_message = "Error: create dest file";
-        ret = FAIL_COPY_FILE;
-        goto __finished;
-    }
-
-    DWORD size=GetFileSize(handlesrc,NULL);
-    buff = new char[size+1];
-    DWORD dwRead=0,dwWrite;
-    result = ReadFile(handlesrc, buff, size, &dwRead, NULL);
     if (!result) {
         DWORD errCode = GetLastError();
         error_message = "Error: " + errCode;
         ret = FAIL_COPY_FILE;
         goto __finished;
     }
-    buff[size]=0;
-    result = WriteFile(handledst,buff,size,&dwWrite,NULL);
-    if (!result) {
-        DWORD errCode = GetLastError();
-        error_message = "Error: " + errCode;
-        ret = FAIL_COPY_FILE;
-        goto __finished;
-    }
-
-	FlushFileBuffers(handledst);
 
 __finished:
     if (src_wstr)
         delete[] src_wstr;
     if (dst_wstr)
         delete[] dst_wstr;
-    if (handlesrc)
-        CloseHandle(handlesrc);
-    if (handledst)
-        CloseHandle(handledst);
-    if (buff)
-        delete[] buff;
 
     return ret;
 #else