如何在窗口消息过程中使用IntPtr

[zhangyaoqi_17]

DLL, Win32 Code
int* rgbptr = NULL;

::SendMessage(_mainHandle, HM_GETSUBPIC, 0, (LPARAM)&rgbptr);

EXE, CLR Code

void Form1::WndProc(Message% m){
switch ( m.Msg )
{
case HM_GETSUBPIC:
{
Bitmap^ bmp = this->form2->GetPictureboxImg();
Rectangle rect = Rectangle(0,0,bmp->Width,bmp->Height);

// Lock the bitmap's bits.
Imaging::BitmapData^ bmpData = bmp->LockBits( rect, Imaging::ImageLockMode::ReadWrite, bmp->PixelFormat );

// Get the address of the first line.
IntPtr ptr = bmpData->Scan0;

// Declare an array to hold the bytes of the bitmap.
// This code is specific to a bitmap with 24 bits per pixels.
int bytes = bmpData->Stride * bmp->Height;


// 请问，怎么把这段内存赋给DLL里的rgbptr指针？？

// Unlock the bits.
bmp->UnlockBits( bmpData );

break;
}

[zhangyaoqi_17]

我自己想了想
struct IMGSTR{
char* mem;
int size;
};
DLL里这样，
IMGSTR img;

::sendMessage(nppData._mainHandle, HM_GETSUBPIC, 0, (LPARAM)&img);

那么EXE里应该是’

(*((IMGSTR *)m.LParam.ToInt32())).mem = (char*)ptr.ToPointer();

(*((IMGSTR *)m.LParam.ToInt32())).size = bytes;

试验一下也可以。不过看起来好复杂，大家有没有更好的办法》？

[zhangyaoqi_17]

就是DLL里怎么取得EXE里图像RGB数组的指针问题