fix(windows): remove the imm32 static linking dependency and reduce compilation warnings (#5347)

docs/integration/driver/windows.rst

@@ -35,7 +35,9 @@ Application Mode
 Prerequisites
 -------------
 
-The minimum Windows OS version this driver supported is Windows Server 2003, or Windows XP with East Asian language support installed because the input method integration support need that.
+The tested minimum Windows OS requirement for this driver is Windows XP RTM.
+
+According to the Windows GDI API this driver used. Maybe the minimum Windows OS requirement for this driver is Windows 2000 RTM.
 
 Configure Windows driver
 --------------------

src/dev/windows/lv_windows_context.c

@@ -97,12 +97,12 @@ void lv_windows_platform_init(void)
     window_class.cbWndExtra = 0;
     window_class.hInstance = NULL;
     window_class.hIcon = NULL;
-    window_class.hCursor = LoadCursorW(NULL, IDC_ARROW);
+    window_class.hCursor = LoadCursorW(NULL, (LPCWSTR)IDC_ARROW);
     window_class.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
     window_class.lpszMenuName = NULL;
     window_class.lpszClassName = L"LVGL.Window";
     window_class.hIconSm = NULL;
-    LV_ASSERT_NULL(RegisterClassExW(&window_class));
+    LV_ASSERT(RegisterClassExW(&window_class));
 }
 
 lv_windows_window_context_t * lv_windows_get_window_context(

src/dev/windows/lv_windows_display.c

@@ -71,7 +71,7 @@ lv_display_t * lv_windows_create_display(
                         &data,
                         0,
                         NULL);
-    LV_ASSERT_NULL(thread);
+    LV_ASSERT(thread);
 
     WaitForSingleObjectEx(data.mutex, INFINITE, FALSE);
 
@@ -154,7 +154,7 @@ static unsigned int __stdcall lv_windows_display_thread_entrypoint(
     ShowWindow(window_handle, SW_SHOW);
     UpdateWindow(window_handle);
 
-    LV_ASSERT_NULL(SetEvent(data->mutex));
+    LV_ASSERT(SetEvent(data->mutex));
 
     data = NULL;
 

src/dev/windows/lv_windows_input.c

@@ -15,10 +15,6 @@
 
 #include <windowsx.h>
 
-#if _MSC_VER >= 1200
-    #pragma comment(lib, "Imm32.lib")
-#endif
-
 #include "../../widgets/textarea/lv_textarea.h"
 #include "../../widgets/keyboard/lv_keyboard.h"
 
@@ -475,6 +471,85 @@ static void lv_windows_push_key_to_keyboard_queue(
     }
 }
 
+static HIMC lv_windows_imm_get_context(
+    HWND window_handle)
+{
+    HMODULE module_handle = GetModuleHandleW(L"imm32.dll");
+    if(!module_handle) {
+        return FALSE;
+    }
+
+    typedef HIMC(WINAPI * function_type)(HWND);
+
+    function_type function = (function_type)(
+                                 GetProcAddress(module_handle, "ImmGetContext"));
+    if(!function) {
+        return FALSE;
+    }
+
+    return function(window_handle);
+}
+
+static BOOL lv_windows_imm_release_context(
+    HWND window_handle,
+    HIMC imm_context_handle)
+{
+    HMODULE module_handle = GetModuleHandleW(L"imm32.dll");
+    if(!module_handle) {
+        return FALSE;
+    }
+
+    typedef BOOL(WINAPI * function_type)(HWND, HIMC);
+
+    function_type function = (function_type)(
+                                 GetProcAddress(module_handle, "ImmReleaseContext"));
+    if(!function) {
+        return FALSE;
+    }
+
+    return function(window_handle, imm_context_handle);
+}
+
+static HIMC lv_windows_imm_associate_context(
+    HWND window_handle,
+    HIMC imm_context_handle)
+{
+    HMODULE module_handle = GetModuleHandleW(L"imm32.dll");
+    if(!module_handle) {
+        return FALSE;
+    }
+
+    typedef HIMC(WINAPI * function_type)(HWND, HIMC);
+
+    function_type function = (function_type)(
+                                 GetProcAddress(module_handle, "ImmAssociateContext"));
+    if(!function) {
+        return FALSE;
+    }
+
+    return function(window_handle, imm_context_handle);
+}
+
+static BOOL lv_windows_imm_set_composition_window(
+    HIMC imm_context_handle,
+    LPCOMPOSITIONFORM composition_form)
+{
+    HMODULE module_handle = GetModuleHandleW(L"imm32.dll");
+    if(!module_handle) {
+        return FALSE;
+    }
+
+    typedef BOOL(WINAPI * function_type)(HIMC, LPCOMPOSITIONFORM);
+
+    function_type function = (function_type)(
+                                 GetProcAddress(module_handle, "ImmSetCompositionWindow"));
+    if(!function) {
+        return FALSE;
+    }
+
+    return function(imm_context_handle, composition_form);
+}
+
 bool lv_windows_keypad_device_window_message_handler(
     HWND hWnd,
     UINT uMsg,
@@ -602,10 +677,14 @@ bool lv_windows_keypad_device_window_message_handler(
             }
         case WM_IME_SETCONTEXT: {
                 if(wParam == TRUE) {
-                    HIMC input_method_context_handle = ImmGetContext(hWnd);
+                    HIMC imm_context_handle = lv_windows_imm_get_context(hWnd);
-                    if(input_method_context_handle) {
+                    if(imm_context_handle) {
-                        ImmAssociateContext(hWnd, input_method_context_handle);
+                        lv_windows_imm_associate_context(
-                        ImmReleaseContext(hWnd, input_method_context_handle);
+                            hWnd,
+                            imm_context_handle);
+                        lv_windows_imm_release_context(
+                            hWnd,
+                            imm_context_handle);
                     }
                 }
 
@@ -613,8 +692,8 @@ bool lv_windows_keypad_device_window_message_handler(
                 break;
             }
         case WM_IME_STARTCOMPOSITION: {
-                HIMC input_method_context_handle = ImmGetContext(hWnd);
+                HIMC imm_context_handle = lv_windows_imm_get_context(hWnd);
-                if(input_method_context_handle) {
+                if(imm_context_handle) {
                     lv_obj_t * textarea_object = NULL;
                     lv_obj_t * focused_object = lv_group_get_focused(
                                                     lv_group_get_default());
@@ -645,12 +724,12 @@ bool lv_windows_keypad_device_window_message_handler(
                             label_object->coords.y1 + textarea->cursor.area.y1;
                     }
 
-                    ImmSetCompositionWindow(
+                    lv_windows_imm_set_composition_window(
-                        input_method_context_handle,
+                        imm_context_handle,
                         &composition_form);
-                    ImmReleaseContext(
+                    lv_windows_imm_release_context(
                         hWnd,
-                        input_method_context_handle);
+                        imm_context_handle);
                 }
 
                 *plResult = DefWindowProcW(hWnd, uMsg, wParam, wParam);

src/lv_init.c

@@ -40,7 +40,7 @@
     #include "draw/vg_lite/lv_draw_vg_lite.h"
 #endif
 #if LV_USE_WINDOWS
-    #include "src/dev/windows/lv_windows_context.h"
+    #include "dev/windows/lv_windows_context.h"
 #endif
 
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