问题描述
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我正在尝试将一些C ++代码移植到C＃，而我需要做的一件事情是使用“ 0”将字节数组传递给另一个进程的窗口。我正在尝试将源代码获取到另一个程序，以便我可以确切地看到它的期望，但是与此同时，这是原始C ++代码的样子：
unsigned long result[5] = {0};
//Put some data in the array
unsigned int res = result[0];
Text winName = \"window name\";
HWND hWnd = FindWindow(winName.getConstPtr(),NULL);
BOOL result = PostMessage(hWnd,WM_COMMAND,10,res);
[DllImport(\"User32.dll\",SetLastError = true,EntryPoint = \"FindWindow\")]
public static extern IntPtr FindWindow(String lpClassName,String lpWindowName);
[DllImport(\"User32.dll\",EntryPoint = \"SendMessage\")]
public static extern int SendMessage(IntPtr hWnd,int Msg,int wParam,ref copYDATASTRUCT lParam);
[StructLayout(LayoutKind.Sequential)]
public struct copYDATASTRUCT
{
public int dwData;
public int cbData;
[MarshalAs(UnmanagedType.ByValArray,SizeConst=32)]
public byte[] lpData;
}
public const int WM_copYDATA = 0x4A;
public static int sendWindowsByteMessage(IntPtr hWnd,byte[] data)
{
int result = 0;
if (hWnd != IntPtr.Zero)
{
int len = data.Length;
copYDATASTRUCT cds;
cds.dwData = wParam;
cds.lpData = data;
cds.cbData = len;
result = SendMessage(hWnd,WM_copYDATA,wParam,ref cds);
}
return result;
}
//*****//
IntPtr hWnd = MessageHelper.FindWindow(null,windowName);
if (hWnd != IntPtr.Zero)
{
int result = MessageHelper.sendWindowsByteMessage(hWnd,lParam);
if (result == 0)
{
int errCode = Marshal.GetLastWin32Error();
}
}
SendMessage
[DllImport(\"User32.dll\",SetLastError = true)]
public static extern IntPtr SendMessage(IntPtr hWnd,UInt32 Msg,IntPtr wParam,IntPtr lParam);
[StructLayout(LayoutKind.Sequential)]
public struct copYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
public IntPtr lpData;
}
public struct BYTEARRDATA
{
public byte[] data;
}
public static IntPtr IntPtrAlloc<T>(T param)
{
IntPtr retval = Marshal.AllocHGlobal(Marshal.SizeOf(param));
Marshal.StructuretoPtr(param,retval,false);
return (retval);
}
public static void IntPtrFree(IntPtr preAllocated)
{
//Ignores errors if preAllocated is IntPtr.Zero!
if (IntPtr.Zero != preAllocated)
{
Marshal.FreeHGlobal(preAllocated);
preAllocated = IntPtr.Zero;
}
}
BYTEARRDATA d;
d.data = data;
IntPtr buffer = IntPtrAlloc(d);
copYDATASTRUCT cds;
cds.dwData = new IntPtr(wParam);
cds.lpData = buffer;
cds.cbData = Marshal.SizeOf(d);
IntPtr copyDataBuff = IntPtrAlloc(cds);
IntPtr r = SendMessage(hWnd,IntPtr.Zero,copyDataBuff);
if (r != IntPtr.Zero)
{
result = r.ToInt32();
}
IntPtrFree(copyDataBuff);
copyDataBuff = IntPtr.Zero;
IntPtrFree(buffer);
buffer = IntPtr.Zero;
解决方法
问题在于COPYDATASTRUCT应该包含一个指针作为最后一个成员，并且您正在传递整个数组。
看一下pinvoke.net上的示例：http://www.pinvoke.net/default.aspx/Structures/COPYDATASTRUCT.html
评论后的更多信息：
给定这些定义：
const int WM_COPYDATA = 0x004A;
[StructLayout(LayoutKind.Sequential)]
struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
public IntPtr lpData;
}
[DllImport(\"User32.dll\",SetLastError = true,EntryPoint = \"FindWindow\")]
public static extern IntPtr FindWindow(String lpClassName,String lpWindowName);
[DllImport(\"User32.dll\",EntryPoint = \"SendMessage\")]
public static extern IntPtr SendMessage(IntPtr hWnd,int Msg,int wParam,ref COPYDATASTRUCT lParam);
WM_COPYDATA
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_COPYDATA:
label3.Text = \"WM_COPYDATA received!\";
COPYDATASTRUCT cds = (COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam,typeof(COPYDATASTRUCT));
byte[] buff = new byte[cds.cbData];
Marshal.Copy(cds.lpData,buff,cds.cbData);
string msg = Encoding.ASCII.GetString(buff,cds.cbData);
label4.Text = msg;
m.Result = (IntPtr)1234;
return;
}
base.WndProc(ref m);
}
SendMessage
Console.WriteLine(\"{0} bit process.\",(IntPtr.Size == 4) ? \"32\" : \"64\");
Console.Write(\"Press ENTER to run test.\");
Console.ReadLine();
IntPtr hwnd = FindWindow(null,\"JimsForm\");
Console.WriteLine(\"hwnd = {0:X}\",hwnd.ToInt64());
var cds = new COPYDATASTRUCT();
byte[] buff = Encoding.ASCII.GetBytes(TestMessage);
cds.dwData = (IntPtr)42;
cds.lpData = Marshal.AllocHGlobal(buff.Length);
Marshal.Copy(buff,cds.lpData,buff.Length);
cds.cbData = buff.Length;
var ret = SendMessage(hwnd,WM_COPYDATA,ref cds);
Console.WriteLine(\"Return value is {0}\",ret);
Marshal.FreeHGlobal(cds.lpData);
lParam
const int WM_COPYDATA = 0x004A;
[DllImport(\"user32.dll\",SetLastError = true)]
static extern IntPtr FindWindow(String lpClassName,String lpWindowName);
[DllImport(\"user32.dll\",SetLastError = true)]
static extern IntPtr SendMessage(IntPtr hWnd,IntPtr wParam,IntPtr lParam);
static IntPtr SendMessage(IntPtr hWnd,byte[] array,int startIndex,int length)
{
IntPtr ptr = Marshal.AllocHGlobal(IntPtr.Size * 3 + length);
Marshal.WriteIntPtr(ptr,IntPtr.Zero);
Marshal.WriteIntPtr(ptr,IntPtr.Size,(IntPtr)length);
IntPtr dataPtr = new IntPtr(ptr.ToInt64() + IntPtr.Size * 3);
Marshal.WriteIntPtr(ptr,IntPtr.Size * 2,dataPtr);
Marshal.Copy(array,startIndex,dataPtr,length);
IntPtr result = SendMessage(hWnd,IntPtr.Zero,ptr);
Marshal.FreeHGlobal(ptr);
return result;
}
private void button1_Click(object sender,EventArgs e)
{
IntPtr hWnd = FindWindow(null,\"Target Window Tittle\");
byte[] data = System.Text.Encoding.ASCII.GetBytes(\"this is the sample text\");
SendMessage(hWnd,data,data.Length);
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_COPYDATA:
byte[] b = new Byte[Marshal.ReadInt32(m.LParam,IntPtr.Size)];
IntPtr dataPtr = Marshal.ReadIntPtr(m.LParam,IntPtr.Size * 2);
Marshal.Copy(dataPtr,b,b.Length);
string str = System.Text.Encoding.ASCII.GetString(b);
MessageBox.Show(str);
// m.Result = put result here;
return;
}
base.WndProc(ref m);
}
IntPtrAlloc
SizeOf(param)
Marshal.UnsafeAddrOfPinnedArrayElement
lpData