互操作问题 [英] Interop question
问题描述
在c＃中执行某些win32消息时，我得到了意想不到的结果。
以下示例假设在另一个应用程序的
按钮控件中返回图像的句柄但它返回一个负面的
句柄...是否有人知道它为什么会返回一个无效的句柄，如
" -989523277" ??
IntPtr ImageHandle =
Win32.SendMessage（Handle，BM_GETIMAGE，IntPtr.Zero，I ntPtr.Zero）;
MessageBox.Show（ImageHandle.ToString（））;
注意：第三个参数设置为IMAGE_BITMAP（0）;如果
按钮不包含图像，则返回0.
谢谢...
When executing some win32 messages in c# I get unexpected results.
The following example is suppose to return the handle of an image in a
button control of another application but it return a negative
handle...is anybody know why it return an invalid handle like
"-989523277" ??
IntPtr ImageHandle =
Win32.SendMessage(Handle,BM_GETIMAGE,IntPtr.Zero,I ntPtr.Zero);
MessageBox.Show(ImageHandle.ToString());
Note : the third param is set to IMAGE_BITMAP (0); it return 0 if
the button contain no image.
Thanks...
推荐答案
2008年8月21日星期四20:35:26 -0700，michelqa< mi ****** @ yahoo.cawrote：
On Thu, 21 Aug 2008 20:35:26 -0700, michelqa <mi******@yahoo.cawrote:
在c＃中执行一些win32消息时，我得到了意想不到的结果。
以下示例假设在另一个应用程序的
按钮控件中返回图像的句柄，但它返回否定
句柄...有人知道为什么它会返回一个无效的句柄，例如
" -989523277" ??
When executing some win32 messages in c# I get unexpected results.
The following example is suppose to return the handle of an image in a
button control of another application but it return a negative
handle...is anybody know why it return an invalid handle like
"-989523277" ??
你能更具体一点吗？为什么你认为价值-989523277
无效的句柄值？你真的试过把它用作HBITMAP
并且失败了吗？你能否展示一个简洁但完整的代码示例，
可靠地展示你实际遇到的任何问题？
Pete
Can you be more specific? Why do you believe the value "-989523277" to be
an invalid handle value? Have you actually tried to use it as an HBITMAP
and had that fail? Can you show a concise-but-complete code sample that
reliably demonstrates whatever problem you''re actually having?
Pete
8月21日，11：44 * pm，Peter Duniho < NpOeStPe ... @nnowslpianmk.com>
写道：
On Aug 21, 11:44*pm, "Peter Duniho" <NpOeStPe...@nnowslpianmk.com>
wrote:
2008年8月21日星期四20:35:26 -0700 ，michelqa< miche ... @ yahoo.cawrote：
On Thu, 21 Aug 2008 20:35:26 -0700, michelqa <miche...@yahoo.cawrote:
在c＃*中执行某些win32消息时，我得到了意想不到的结果。
以下示例假设在另一个应用程序的
按钮控件中返回图像的句柄，但它返回一个否定的
句柄...是否有人知道它返回的原因一个无效的句柄，如
" -989523277" ??
When executing some win32 messages in c# *I get unexpected results.
The following example is suppose to return the handle of an image in a
button control of another application but it return a negative
handle...is anybody know why it return an invalid handle like
"-989523277" ??
你能更具体一点吗？ *为什么你认为价值-989523277 tobe *
无效的句柄值？ *您是否真的尝试将其用作HBITMAP *
并且失败了？ *你能否展示一个简洁但完整的代码样本*
可靠地展示你实际遇到的任何问题？
Pete
Can you be more specific? *Why do you believe the value "-989523277" tobe *
an invalid handle value? *Have you actually tried to use it as an HBITMAP *
and had that fail? *Can you show a concise-but-complete code sample that *
reliably demonstrates whatever problem you''re actually having?
Pete
我认为它是无效的，因为它是否定的，因为我无法使用
在我的应用程序中重新创建位图。 .it返回一个Generic
例外
//句柄=另一个应用程序的按钮句柄
IntPtr ImageHandle =
Win32.SendMessage（Handle，BM_GETIMAGE，IntPtr.Zero，I ntPtr.Zero）;
MessageBox.Show（ImageHandle.ToString（））;
System.Drawing.Bitmap Bitmap =
System.Drawing.Bitmap.FromHbitmap（ImageHandle）; //通用异常
来自gdi..invalid句柄？
//只想在这里获得一个可用的位图
I suppose it''s invalid since it''s negative and since i''m not able to
recreate the bitmap in my application...it return a "Generic
exception"
//Handle = button handle of another application
IntPtr ImageHandle =
Win32.SendMessage(Handle,BM_GETIMAGE,IntPtr.Zero,I ntPtr.Zero);
MessageBox.Show(ImageHandle.ToString());
System.Drawing.Bitmap Bitmap =
System.Drawing.Bitmap.FromHbitmap(ImageHandle); //generic exception
from gdi..invalid handle?
// Just want to get a usable bitmap here
好的，我会尝试解释这个问题：
1-我知道WM_GETIMAGE假设返回一个hImage hex
c50512b3（3305444019 ）...我知道因为我正在记录消息
在SPY ++中
2-我的c＃app中的sendMessage返回-989523277（或
8975925797277995699修改sendmessage定义时返回
长而不是IntPtr）***为什么会出现这种差异???? ****
3-即使正确的图像处理硬编码如下：
System.Drawing.Image MyImg =
System.Drawing .Image.FromHbitmap（（IntPtr）330544401 9）;
我收到错误：算术运算导致溢出。
据我所知，FromHbitmap想要一个IntPtr和3305444019是一个整数
一个整数
不要认为一个更完整的例子将有助于理解这个问题
但这是我的例子......我有一个Win32应用程序，我想要复制
按钮图像并将图像放在按钮或图片框中
my c＃
[DllImport（" user32.dll"）]
public static extern IntPtr SendMessage（IntPtr hwnd，int msg，IntPtr
wparam，IntPtr lparam）;
int BM_GETIMAGE = 0x00F6;
IntPtr ImageHandle =
SendMessage（Handle，BM_GETIMAGE，IntPtr.Zero ，IntPtr.Zero）;
MessageBox.Show（ImageHandle.ToString（））;
System.Drawing.Image MyImg =
System.Drawing.Image.FromHbitmap（（IntPtr）330544401 9）; //算术
操作导致溢出。
//System.Drawing.Image MyImg =
System.Drawing.Image.FromHbitmap（ ImageHandle）; //例外
按钮Button1 =新按钮（）;
Button1.Image = MyImg;
Ok , I''ll try to explain the problem :
1- I know that WM_GETIMAGE is suppose to return an hImage hex
c50512b3 (3305444019) ... I know that because I''m logging the message
in SPY++
2- My sendMessage in my c# app return -989523277 (or
8975925797277995699 when modifying sendmessage definition to return a
long instead of a IntPtr) *** Why this difference???? ****
3- Even with the correct image handle hardcoded like this :
System.Drawing.Image MyImg=
System.Drawing.Image.FromHbitmap((IntPtr)330544401 9);
I get the error : Arithmetic operation resulted in an overflow.
As I understand it FromHbitmap want an IntPtr and 3305444019 is to big
for a Integer
Dont think a more complete example will help to understand the problem
but here is my example...I have a Win32 application and I want to copy
Button image from it and put the image in a button or a picturebox in
my c#
[DllImport("user32.dll")]
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, IntPtr
wparam, IntPtr lparam);
int BM_GETIMAGE = 0x00F6;
IntPtr ImageHandle =
SendMessage(Handle,BM_GETIMAGE,IntPtr.Zero,IntPtr. Zero);
MessageBox.Show(ImageHandle.ToString());
System.Drawing.Image MyImg=
System.Drawing.Image.FromHbitmap((IntPtr)330544401 9); //Arithmetic
operation resulted in an overflow.
//System.Drawing.Image MyImg=
System.Drawing.Image.FromHbitmap(ImageHandle); //Exception
Button Button1 = new Button();
Button1.Image=MyImg;
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