强制卸载DLL - ReleaseWindowsDll

函数简介

强制卸载已经注入到指定窗口的Hook DLL。此函数用于清理和释放窗口相关的DLL资源，但需要谨慎使用，因为它会影响其他使用相同DLL的OLA对象。

接口名称

ReleaseWindowsDll

DLL调用

int ReleaseWindowsDll(long ola, long hwnd)

参数定义:

  • ola (长整型数): OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
  • hwnd (长整型数): 指定的窗口句柄，必须是有效的窗口句柄。

示例:

// 强制卸载指定窗口的Hook DLL
int ret = ReleaseWindowsDll(ola, hwnd);
if (ret == 1) {
    printf("Hook DLL unloaded successfully\n");
    
    // 验证窗口状态
    if (GetWindowState(ola, hwnd, 2) == 1) {  // 检查是否可见
        printf("Window is still visible after DLL unload\n");
    }
} else {
    printf("Failed to unload Hook DLL\n");
}

// 在进程退出前清理所有Hook DLL
void CleanupHookDLLs() {
    // 获取所有相关窗口
    long hwndArray[10];  // 假设最多有10个相关窗口
    int count = 0;
    
    // 这里需要实现获取相关窗口的逻辑
    // ...
    
    // 卸载每个窗口的Hook DLL
    for (int i = 0; i < count; i++) {
        ret = ReleaseWindowsDll(ola, hwndArray[i]);
        if (ret == 1) {
            printf("Successfully unloaded Hook DLL from window %ld\n", hwndArray[i]);
        } else {
            printf("Failed to unload Hook DLL from window %ld\n", hwndArray[i]);
        }
    }
}

// 安全卸载单个窗口的Hook DLL
bool SafeUnloadHookDLL(long targetHwnd) {
    // 首先检查窗口是否存在
    if (GetWindowState(ola, targetHwnd, 0) == 0) {
        printf("Window does not exist\n");
        return false;
    }
    
    // 尝试卸载DLL
    int ret = ReleaseWindowsDll(ola, targetHwnd);
    if (ret == 1) {
        printf("Hook DLL unloaded successfully from window %ld\n", targetHwnd);
        return true;
    } else {
        printf("Failed to unload Hook DLL from window %ld\n", targetHwnd);
        return false;
    }
}

COM调用

int ReleaseWindowsDll(long hwnd)

参数定义:

  • hwnd (长整型数): 指定的窗口句柄，必须是有效的窗口句柄。

示例:

# 强制卸载指定窗口的Hook DLL
def unload_hook_dll(hwnd):
    ret = ola.ReleaseWindowsDll(hwnd)
    if ret == 1:
        print(f"Hook DLL unloaded successfully from window {hwnd}")
        
        # 验证窗口状态
        if ola.GetWindowState(hwnd, 2) == 1:  # 检查是否可见
            print("Window is still visible after DLL unload")
        return True
    else:
        print(f"Failed to unload Hook DLL from window {hwnd}")
        return False

# 安全的DLL卸载函数
def safe_unload_hook_dll(hwnd):
    try:
        # 检查窗口是否存在
        if ola.GetWindowState(hwnd, 0) == 0:
            print("Window does not exist")
            return False
            
        # 检查窗口是否响应
        if ola.GetWindowState(hwnd, 6) == 1:
            print("Warning: Window is not responding")
            
        # 尝试卸载DLL
        return unload_hook_dll(hwnd)
        
    except Exception as e:
        print(f"Error during DLL unload: {e}")
        return False

# 批量清理Hook DLL
def cleanup_hook_dlls(window_list):
    success_count = 0
    fail_count = 0
    
    for hwnd in window_list:
        if safe_unload_hook_dll(hwnd):
            success_count += 1
        else:
            fail_count += 1
    
    print(f"DLL unload summary:")
    print(f"  Successful: {success_count}")
    print(f"  Failed: {fail_count}")
    
    return success_count, fail_count

# 示例使用
target_windows = [hwnd1, hwnd2, hwnd3]  # 需要清理的窗口句柄列表
success, failed = cleanup_hook_dlls(target_windows)

返回值

整型数:

  • 0: 卸载失败（可能原因：无效的窗口句柄、DLL已卸载、权限不足等）
  • 1: 卸载成功

注意事项

  1. 此操作为强制卸载，会影响使用相同DLL的其他OLA对象
  2. 建议在以下情况下使用此函数：
    • 程序退出前的清理工作
    • 确认没有其他OLA对象需要使用该DLL
    • 处理DLL加载异常的情况
  3. 卸载DLL后，相关的功能将无法使用
  4. 建议在卸载前保存必要的数据
  5. 某些系统窗口可能会拒绝DLL卸载操作
  6. 如果有多个OLA对象共享DLL，应协调好卸载时机
  7. 建议实现错误处理和日志记录机制
  8. 在批量操作时要注意性能和稳定性
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