IntPtr转换为结构单点触摸

本文关键字：单点 触摸 结构 转换 IntPtr | 更新日期: 2023-09-27 18:20:25

我绑定到目标c库：

[Export ("getParsedStatus::")]
[CompilerGenerated]
public virtual void GetParsedStatus (IntPtr starPrinterStatus, global::System.UInt32 level)
{
    if (IsDirectBinding) {
        Definition.Messaging.void_objc_msgSend_StarPrinterStatus_UInt32 (this.Handle, selGetParsedStatus_Handle, starPrinterStatus, level);
    } else {
        Definition.Messaging.void_objc_msgSendSuper_StarPrinterStatus_UInt32 (this.SuperHandle, selGetParsedStatus_Handle, starPrinterStatus, level);
    }
}

其中原始目标c库函数看起来像：

(void)getParsedStatus:(void *)starPrinterStatus :(u_int32_t)level;

我的C#代码似乎一切正常：

SMPort port = null;
Byte[] commands = null;
uint totalAmountWritten = 0;
uint commandSize=0;
StarPrinterStatus_2 stat;
IntPtr status;
private void test()
{
    try{
        stat = new StarPrinterStatus_2();
        port = new SMPort(new NSString("BT:PRNT Star"), new NSString("mini"), 10000);
        status = Marshal.AllocHGlobal(Marshal.SizeOf(stat));
        port.GetParsedStatus( status ,(uint) 2);
        Marshal.PtrToStructure(status, stat);
        port.BeginCheckedBlock(status, (uint) 2);
        commands = new byte[]{0x1b, 0x40, 0x1b, 0x2d, 0x31, 0x1b, 0x45, 0x00, 0x1b, 0x7b, 0x00, 0x1d, 0x42, 0x00, 0x1d, 0x21, 0x31,0x1d, 0x4c, 0x00, 0x00, 0x1b, 0x61, 0x31, 0xA, 0xA, 0xA };
        IntPtr ptr2 = Marshal.AllocHGlobal(commands.Length*4);
        int i = 0;
        foreach(byte b in commands)
        {
            Marshal.WriteByte(ptr2,i*4, b);
        }
        totalAmountWritten = 0;
        commandSize = (uint)commands.Length;
        //while (totalAmountWritten < commandSize)
        //foreach(byte b in commands)
        //{
            uint remaining = commandSize - totalAmountWritten;
            uint amountWritten = port.WritePort(ptr2, totalAmountWritten, remaining);
            totalAmountWritten += amountWritten;
        //}
        port.EndCheckedBlock(status, (uint) 2);
        //Marshal.FreeHGlobal(status);
    //  Marshal.FreeHGlobal(ptr2);
        Port.ReleasePort(port);
    }
    catch(Exception ex) {
        MessageBox.Show (ex.Message, "Error", MessageBoxButton.OK);
    }
}

然而，当我调用port.GetParsedStatus( status ,(uint) 2);时，我如何将状态转换为结构。。。我尝试过封送处理，但这会产生错误。其他一切似乎都正常工作——就像在中，我可以让打印机进行一点打印，即使它们是随机字符——我假设我的程序实际上正在与打印机通信——这意味着绑定和库都工作得很好。。。这只是将IntPtr获取到一个结构的问题。。。

IntPtr转换为结构单点触摸

最简单的方法可能是将绑定声明为指向结构的指针：

 public void GetParsedStatus (ref StarPrinterStatus_2 starPrinterStatus, uint level);

然后像这样使用：

 port.GetParsedStatus (ref stat, (uint) 2);
相关文章：