怎样获取当前窗口句柄

[DllImport("user32dll", EntryPoint = "FindWindow", CharSet = CharSetAuto)]

static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

/// <summary>

/// 获取有名字窗体句柄

/// </summary>

/// <param name="caption">窗体名</param>

/// <param name="delay">循环查询次数</param>

/// <param name="maxTries">停顿时间</param>

/// <returns>句柄 IntPtr</returns>

static IntPtr FindMainWindowHandle(String caption,int delay,int maxTries)

{

IntPtr mwh = IntPtrZero;

bool foundWindow = false;

int attempts = 0;

do

{

mwh = FindWindow(null, caption);

if (mwh == IntPtrZero)

{

ConsoleWriteLine("Form not yet found\n");

ThreadSleep(maxTries);

++attempts;

}

else

{

ConsoleWriteLine("Form has been found");

foundWindow = true;

}

}

while(!foundWindow && attempts<delay);

if(mwh != IntPtrZero)

return mwh;

else

throw new Exception("Coule not find Main Window");

//调用FindMainWindowHandle()方法以获取窗体句柄,例:

IntPtr wHandle= FindMainWindowHandle("窗体名",10,100);

ConsoleWriteLine("窗体句柄: " + wHandle);

int GetDIBits( HDC hdc, // handle to DC

HBITMAP hbmp, // handle to bitmap

UINT uStartScan, // first scan line to set

UINT cScanLines, // number of scan lines to copy

LPVOID lpvBits, // array for bitmap bits

LPBITMAPINFO lpbi, // bitmap data buffer

UINT uUsage // RGB or palette index);

}

lpvBits 就是二进制图像。。

这是 C 语言(以下按个人已编程者的触觉理解)

2） I=imread('grayjpg'); //获取图像句柄

y=imrotate(I,90,'bilinear'); //旋转90度

imshow(I); //显示原图像

figure; //描绘

imshow(y) //显示旋转后图像

（3） imshow grayjpg; //显示原图像

I=imcrop; //裁剪

figure; //描绘

imshow(I) //显示

// 以下无法想象

（4） figure(1)

load imdemos saturn2;

imshow(saturn2);

figure(2);

B=fftshift(fft2(saturn2));

BB= fft2(saturn2);

imshow(log(abs(BB)),[])

figure;

imshow(log(abs(B)),[])

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