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我绑定到一个目标 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);
    }
}

原始目标 c 库函数如下所示：

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

一切似乎都在使用我的 C# 代码：

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);
    }
}

但是，当我打电话时，让我们说我port.GetParsedStatus( status ,(uint) 2);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 - 因为即使它们是随机字符，我也能够让打印机进行一点打印我假设我的程序实际上正在与打印机通信 - 这意味着绑定和库是一切运行良好...只是将 IntPtr 转换为结构的问题...

4

1 回答 1

2

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);

然后像这样使用它：

 port.GetParsedStatus (ref stat, (uint) 2);
于 2013-06-28T21:51:09.343 回答