用DLL中的函数在主对话框的控件上绘图，如按钮或Static

最新推荐文章于 2019-02-22 18:49:24 发布

wmnmtm

最新推荐文章于 2019-02-22 18:49:24 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/wmnmtm/article/details/82921834

本文介绍了一种通过加载动态链接库(DLL)实现绘图功能的方法。具体展示了如何使用DLL中的函数在MFC对话框中绘制线条，并提供了具体的C++代码实现细节。

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用DLL中的函数在主对话框的控件上绘图，如按钮或Static - 加菲 - 视频会议软件开发 - 加菲

对话框按钮响应：

void CTest2Dlg::OnButton4()

{

typedef void(*pDrawLinePP)(CDC *pDC,CWnd *pWnd,CPoint pt1,CPoint pt2);

HINSTANCE hDLL;

pDrawLinePP DrawLine1;

hDLL=LoadLibrary("WBDLL.dll");//加载动态链接库MyDll.dll文件；

DrawLine1 = (pDrawLinePP)GetProcAddress(hDLL,"DrawLinePP");

CDC *pDC;

pDC = GetDlgItem(IDC_BUTTON4)->GetDC();

CPoint pt1,pt2,pt3;

pt1.x = 20;

pt1.y = 0;

pt2.x = 20;

pt2.y = 50;

pt3.x = 60;

pt3.y = 50;

DrawLine1(pDC,this,pt1,pt2);

DrawLine1(pDC,this,pt1,pt3);

pDC = GetDlgItem(IDC_STATIC_FRAME)->GetDC();

DrawLine1(pDC,GetDlgItem(IDC_STATIC_FRAME),pt1,pt2);

DrawLine1(pDC,GetDlgItem(IDC_STATIC_FRAME),pt1,pt3);

FreeLibrary(hDLL);//卸载MyDll.dll文件；

}

DLL

extern "C" __declspec(dllexport) int TextFun1(int a, int b);
extern "C" __declspec(dllexport) void FunStr(CString str1,CString str2,char * chr);
extern "C" __declspec(dllexport) void DrawLine(CDC *pDC,CDialog *pDlg);
extern "C" __declspec(dllexport) void DrawLinePointToPoint(CDC *pDC,CDialog *pDlg,CPoint pt1,CPoint pt2);
extern "C" __declspec(dllexport) void DrawLinePP(CDC *pDC,CWnd *pWnd,CPoint pt1,CPoint pt2);

void DrawLinePointToPoint(CDC *pDC,CDialog *pDlg,CPoint pt1,CPoint pt2)
{
pDC->MoveTo(pt1);
pDC->LineTo(pt2);
}
//在CWnd对象上绘图
void DrawLinePP(CDC *pDC,CWnd *pWnd,CPoint pt1,CPoint pt2)
{
pDC->MoveTo(pt1);
pDC->LineTo(pt2);
}