社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5143阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: F#S^Q`  
  J{8_4s!Xt>  
  一、实现方法 0&$+ CWSM  
4?YhqJ  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: |eT?XT<=o  
q H&7Q{  
#pragma data_seg("shareddata") P7r?rbO"  
HHOOK hHook =NULL; //钩子句柄 *yp}#\rk  
UINT nHookCount =0; //挂接的程序数目 Pe@M_ r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 41 sClC"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 h*2Q0GRX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `F<)6fk  
static int KeyCount =0; g0t$1cUR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X;ef&n`U0  
#pragma data_seg() gzqx{ ]  
s6<`#KFAg  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 o_   
S%n5,vwE  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: (pXZ$R:  
3f9J! B`n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cQDn_Sjhi  
cKey,UCHAR cMask) rq'Cj<=Zj  
{ )2T?Z)"hO  
 BOOL bAdded=FALSE; V~ -<VM6  
 for(int index=0;index<MAX_KEY;index++){ (9q61z A  
  if(hCallWnd[index]==0){ "orZje9AC  
   hCallWnd[index]=hWnd; q)R&npP7  
   HotKey[index]=cKey; `[\*1GpAo  
   HotKeyMask[index]=cMask; Ys,}L.  
   bAdded=TRUE; v{4K$o  
   KeyCount++; #UGtYD}"  
   break; a.)Gd]}g  
  } 5_";EED  
 }  TA;  
 return bAdded; J \U}U'qP  
} \[&`PD  
//删除热键 ^S!^$d*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sl^i%xJ|l'  
{ n,sl|hv2U  
 BOOL bRemoved=FALSE; )qs>Z?7  
 for(int index=0;index<MAX_KEY;index++){ @2Xw17[f35  
  if(hCallWnd[index]==hWnd){ Wj2]1A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^G'8!!ys  
    hCallWnd[index]=NULL; qH'T~# S  
    HotKey[index]=0; KB+,}7  
    HotKeyMask[index]=0; S)Cd1`Gf  
    bRemoved=TRUE; $7~ k#_#PC  
    KeyCount--; ws9F~LmLbr  
    break; *44^M{ti<  
   } l]R O'  
  } 3Gi#WV4$  
 } q:N"mp<%  
 return bRemoved; vtw{ A}  
} |0YDCMq(  
[.;$6C/?  
FEgM4m.(G<  
  DLL中的钩子函数如下: IT& U%hw  
n1K"VjZk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {M: Fsay>p  
{ cl4`FU  
 BOOL bProcessed=FALSE; dn/0>|5OF(  
 if(HC_ACTION==nCode) n[4F\I>  
 { HU ]Yv+3   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g2L^cP>2  
   switch(wParam) bnBnE[y<'  
   {  (UWP=L1  
    case VK_MENU: +r[u4?  
     MaskBits&=~ALTBIT; bTB/M=M  
     break; 0-#SvTf>;:  
    case VK_CONTROL: @? 4-  
     MaskBits&=~CTRLBIT; 0eq="|n^|  
     break; O~yPe.  
    case VK_SHIFT: fk-zT  
     MaskBits&=~SHIFTBIT; W6f?/{Oo8  
     break; n%PHHu  
    default: //judge the key and send message K~ gt=NH  
     break; i)fAm$8# G  
   } '6i"pJ0%  
   for(int index=0;index<MAX_KEY;index++){ i/;Ql, gm  
    if(hCallWnd[index]==NULL) Y$SZqW0!/  
     continue; ecIxiv\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +e_NpC  
    { =YlsJ={h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #JVw`=P  
     bProcessed=TRUE; Y6L_ _ RT  
    } |&Gm.[IX;q  
   } to~Ap=E  
  } 6QVdnXoG/  
  else if((lParam&0xc000ffff)==1){ //有键按下 a$!|)+  
   switch(wParam) *BzqAi0  
   { em`z=JGG  
    case VK_MENU: )s^D}I(  
     MaskBits|=ALTBIT; |x*~PXb  
     break; ` MIZqHM @  
    case VK_CONTROL: 1HYrJb,d  
     MaskBits|=CTRLBIT; :f (UZmV$  
     break; b|| c^f  
    case VK_SHIFT: bmN'{09@  
     MaskBits|=SHIFTBIT; 8'J"+TsOW  
     break; 9[}L=n  
    default: //judge the key and send message :'RmT3  
     break; .}gGtH,b3  
   } y]$%>N0vLX  
   for(int index=0;index<MAX_KEY;index++){ B|E4(,]^  
    if(hCallWnd[index]==NULL) U{(B)dFTH  
     continue; $%9.qy\8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !v(j#N< m  
    { C5mq@$6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SQ7Ws u>T@  
     bProcessed=TRUE; #DjSS.iW  
    } M qq/k J  
   } -Z )j"J  
  } q_PxmPE@3v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5P~{*of  
   for(int index=0;index<MAX_KEY;index++){ =Tv;?U C  
    if(hCallWnd[index]==NULL) A?[06R5E#  
     continue; !}7FC>Cx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z0[_5Cm/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KS%LXc('  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3>FeTf#:  
   } _E0XUT!rA  
  } ?,8|K B  
 } BUR96YN.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?B> { rj  
} Wt=QCutt  
`8^4,  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ?v8.3EE1\o  
nojJGeW%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :D(4HXHK%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); le1  
e<wA["^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: C-Y~T;53  
@H%)!f]zWt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V<&x+?>S  
{ x { Z_rD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J`/t;xk  
 { >*/\Pg6^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q;A1&UA2  
  SaveBmp(); =+24jHs  
  return FALSE; D"kss5>w  
 } v eP)ElX  
 …… //其它处理及默认处理 1#rcxUSi  
} &&Ruy(&]I  
.}'49=c  
yH}(0  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 t){})nZ/4  
}pk)\^/w/  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 z|,YO6(L  
' lt5|  
  二、编程步骤 '%U'%')  
WE;QEA/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MDkcG"O  
_XLGXJ[B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J^t-pU  
.W4P/P w'  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; -|s w\Q  
mO];+=3v8  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 39 D!e&  
HLMcOuj  
  5、 添加代码,编译运行程序。 5P=3.Mk  
Mf'T\^-!  
三、程序代码 i=Nq`BoQf  
oSd TQ$U!D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -!d'!; ]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) $7k"?M_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ -!_f-Nny  
#if _MSC_VER > 1000 )-yJKmV  
#pragma once 5Ii`|?vg  
#endif // _MSC_VER > 1000 1%Yd] 1c(  
#ifndef __AFXWIN_H__ -*`7Q'}%  
#error include 'stdafx.h' before including this file for PCH )Fe6>tE  
#endif er<yB#/;-  
#include "resource.h" // main symbols +fh@m h0[  
class CHookApp : public CWinApp ']Q4SB"q  
{ !4"(>Rnw  
 public: QH z3  
  CHookApp(); [4p~iGC  
  // Overrides b)+nNqY|  
  // ClassWizard generated virtual function overrides .`./MRC  
  //{{AFX_VIRTUAL(CHookApp) 1Q[I$=-F  
 public: "cJ))v-'  
  virtual BOOL InitInstance(); ;U+4!N  
  virtual int ExitInstance(); \gz(C`4{j  
  //}}AFX_VIRTUAL ..FEyf  
  //{{AFX_MSG(CHookApp) $7J9Yzp?L  
  // NOTE - the ClassWizard will add and remove member functions here. 2HA-q),6  
  // DO NOT EDIT what you see in these blocks of generated code ! {owXyQ2mK  
  //}}AFX_MSG rlUo#  
  DECLARE_MESSAGE_MAP() o2AfMSt.  
}; 80(Olf@PE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hA'i|;|ZYc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^/'zU,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1 8*M  
BOOL InitHotkey(); .D X  
BOOL UnInit(); m5c=h  
#endif OKW}8qM  
YK xkO  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n 0/<m.  
#include "stdafx.h" ,\fp .K<  
#include "hook.h" Jcy{ ~>@7  
#include <windowsx.h> G5MoIC  
#ifdef _DEBUG pCacm@(hG  
#define new DEBUG_NEW ~&}e8ah2  
#undef THIS_FILE P8& BtA  
static char THIS_FILE[] = __FILE__; |DUWB;  
#endif RA];hQI?  
#define MAX_KEY 100 o]R*6$  
#define CTRLBIT 0x04 KM-d8^\:  
#define ALTBIT 0x02 1>~bzXY#  
#define SHIFTBIT 0x01 -hd@<+;E  
#pragma data_seg("shareddata") #BLx +mLq  
HHOOK hHook =NULL; pL [JGn  
UINT nHookCount =0; ( *&E~ g  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey RpmOg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >O;V[H2[  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey X }V}%  
static int KeyCount =0; 1eP`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift )~X.x"}8k  
#pragma data_seg() #gq!L  
HINSTANCE hins; ?hC,49  
void VerifyWindow(); {>v5~G  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) gT-"=AsxZQ  
//{{AFX_MSG_MAP(CHookApp) \iP=V3  
// NOTE - the ClassWizard will add and remove mapping macros here. NIo!WOi  
// DO NOT EDIT what you see in these blocks of generated code! * \$m1g7b  
//}}AFX_MSG_MAP C%RYQpY*c  
END_MESSAGE_MAP() " ""k}M2A  
twWzS 4;  
CHookApp::CHookApp() * :kMv;9  
{ i!<1&{  
 // TODO: add construction code here, !VDNqW  
 // Place all significant initialization in InitInstance -P6Z[ V%  
} -){aBMOv3  
J@}PBHK+  
CHookApp theApp; 1m~-q4D)V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;% <[*T:*'  
{ K[q{)>,9  
 BOOL bProcessed=FALSE; |tr^ `Z  
 if(HC_ACTION==nCode) ;:PxWm|_  
 { zG* >g  
  if((lParam&0xc0000000)==0xc0000000){// Key up N^Hj%5  
   switch(wParam) P Dgd'y  
   { '.B5CQ  
    case VK_MENU: \{EYkk0]  
     MaskBits&=~ALTBIT; xqQLri}  
     break; iJU=98q  
    case VK_CONTROL: H`bS::JI-  
     MaskBits&=~CTRLBIT; koojF|H>  
     break; +RBX2$kB  
    case VK_SHIFT: ;Yve m  
     MaskBits&=~SHIFTBIT; +HT?> k  
     break; xNd p]u  
    default: //judge the key and send message Oq9E$0JW  
     break; B&+)s5hh  
   } ,,c+R?D  
   for(int index=0;index<MAX_KEY;index++){ ?E}9TQ  
    if(hCallWnd[index]==NULL) 0-Ga2Go9  
     continue; =91wC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d-cW47  
    { kNd(KQ<.17  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^wIg|Gc  
     bProcessed=TRUE; i5 0c N<o  
    } oTN:Q"oK7?  
   } z&c|2L-u6  
  } |)65y  
  else if((lParam&0xc000ffff)==1){ //Key down QOR92}yC  
   switch(wParam) /O}lSXo6E  
   { WYN0,rv1:+  
    case VK_MENU: iLt2L;v>h  
     MaskBits|=ALTBIT; tMiy`CPh  
     break;  3 GL,=q  
    case VK_CONTROL: ) ^`V{iD  
     MaskBits|=CTRLBIT; G]n_RP$G  
     break; lyD=n  
    case VK_SHIFT: U#G<cV79  
     MaskBits|=SHIFTBIT; 2!_DkE  
     break; b_vKP  
    default: //judge the key and send message u[ E0jI  
     break; ?,`g h}>  
   } /!'Png0!  
   for(int index=0;index<MAX_KEY;index++) w m|WER*.  
   { YTD&swk  
    if(hCallWnd[index]==NULL) TD sjNFe3  
     continue; [XhG7Ly  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 60G(jO14  
    { Alk+MwjR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `t"7[Zk  
     bProcessed=TRUE; f>iDq C4  
    } l@0${&n  
   } Vq599M:)V  
  } %i) 0sE T  
  if(!bProcessed){ BJgHel+N  
   for(int index=0;index<MAX_KEY;index++){ +bGO"*  
    if(hCallWnd[index]==NULL) 8'ut[  
     continue; jf.WmiDC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $|tk?Sps  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P=aYwmC  
   } TbD $lx3>  
  } d%K&  
 } VXnWY8\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !CdF,pd/)m  
} t2Px?S?  
TQtHU6  
BOOL InitHotkey() wBJ|%mc3TA  
{ R"y xpw  
 if(hHook!=NULL){ kX2Z@ w`  
  nHookCount++; yAFt|<  
  return TRUE; ;\(LovUy6  
 } CofTTYl  
 else 3a[LM!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dZY|6  
  if(hHook!=NULL) rJ{k1H>  
   nHookCount++; Z,DSTP\|  
  return (hHook!=NULL); 8!{ }WLwb  
} u+O"c  
BOOL UnInit() KF6N P  
{ q|}O-A*wa  
 if(nHookCount>1){ fR b  
  nHookCount--; /:v}Ni"6nF  
  return TRUE; `-.6;T}2U  
 } Xf[;^?]X  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r PTfwhs  
 if(unhooked==TRUE){ $Xh5N3  
  nHookCount=0; P]iJ"d]+X  
  hHook=NULL; !"ir}Y%  
 } |l-O e  
 return unhooked; RBfzti6  
} V,% K"b=  
IE3GZk+a~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y4+ ]5;B8  
{ 1(pv 3  
 BOOL bAdded=FALSE; rp4{lHw>C/  
 for(int index=0;index<MAX_KEY;index++){ (f2r4Io|}  
  if(hCallWnd[index]==0){ 9^8_^F  
   hCallWnd[index]=hWnd; C[';B)a  
   HotKey[index]=cKey; ,vo]WIQ\:  
   HotKeyMask[index]=cMask; e=s({V  
   bAdded=TRUE; },{sJ0To  
   KeyCount++; 1\%@oD_zG  
   break; +s6v!({Z  
  } vQGv4  
 } LM(r3sonb  
 return bAdded; W7c B  
} b%KcS&-6  
oWx^_wQ-=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Av0(zA2  
{ nly}ly Q/  
 BOOL bRemoved=FALSE; 9f/l"  
 for(int index=0;index<MAX_KEY;index++){ Z&4L///  
  if(hCallWnd[index]==hWnd){ w5yX~8UzJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ III:j hh  
    hCallWnd[index]=NULL; ">M&/}4  
    HotKey[index]=0; 3ZN\F  
    HotKeyMask[index]=0; ]9~Il#  
    bRemoved=TRUE; P+y XC^ ,  
    KeyCount--; g{ ;OgS3>  
    break; ,:#h;4!VRF  
   } a*t @k*d_  
  } r7#.DJnN.  
 } W56VA>ia  
 return bRemoved; g<ov` bF  
} "[rz*[o8I  
&grvlK  
void VerifyWindow() E,dUO;  
{ HRJ\H- V  
 for(int i=0;i<MAX_KEY;i++){ $=X>5B  
  if(hCallWnd!=NULL){ jo1z#!|Yw}  
   if(!IsWindow(hCallWnd)){ bPif"dhHe  
    hCallWnd=NULL; ?D,j!Hy  
    HotKey=0; fq4uiFi<  
    HotKeyMask=0; L& rtN@5;  
    KeyCount--; DAg*  
   } orYZ<,u  
  } U<r!G;^`  
 } =.OzpV)=V  
} mfF `K2R  
XH(-anU"!P  
BOOL CHookApp::InitInstance() Y DW^N] G  
{ %iME[| u&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8GRB6-.h  
 hins=AfxGetInstanceHandle(); \3] O?'  
 InitHotkey(); $BT[fJ'k  
 return CWinApp::InitInstance(); GIT"J}b}  
} HO_(it \  
?Q$a@)x#  
int CHookApp::ExitInstance() o~W,VhCP  
{ B'mUDW8\D  
 VerifyWindow(); :>0,MO.^~K  
 UnInit(); MBLDx sZ-  
 return CWinApp::ExitInstance(); 6tjV^sjs  
} }#; .b'`  
K<r5jb  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !Eb|AHa  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ? HNuffk  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `>b,'u6F  
#if _MSC_VER > 1000 0rQ r#0`  
#pragma once KX3A|  
#endif // _MSC_VER > 1000 uJlW$Oc:.  
@y'ZM  
class CCaptureDlg : public CDialog @v:Eh  
{ X&| R\v=}  
 // Construction c10$5V&@  
 public: 717G CL@  
  BOOL bTray; _yX.Apv]  
  BOOL bRegistered; Jh<s '&FR  
  BOOL RegisterHotkey(); OSLZ7B^  
  UCHAR cKey; ^fyue~9u  
  UCHAR cMask; ,KD?kSIf  
  void DeleteIcon(); | lZJt  
  void AddIcon(); Fa\jVFIQ  
  UINT nCount; ?Z4%u8Krvz  
  void SaveBmp(); Vy|4k2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Rry] 6(  
  // Dialog Data -rjQ^ze  
  //{{AFX_DATA(CCaptureDlg) AlG5n'  
  enum { IDD = IDD_CAPTURE_DIALOG }; /u_9uJ"-K(  
  CComboBox m_Key; l]#=I7 6  
  BOOL m_bControl; 7lA_*t@y  
  BOOL m_bAlt; kj.9\  
  BOOL m_bShift; ?FUK_]  
  CString m_Path; +]z Rn  
  CString m_Number; #D%6b  
  //}}AFX_DATA XN>bv|*q  
  // ClassWizard generated virtual function overrides BjsTHS&  
  //{{AFX_VIRTUAL(CCaptureDlg) fL d2{jI,  
 public: &cJ?mSI  
  virtual BOOL PreTranslateMessage(MSG* pMsg); LXsZk|IhM  
 protected: AaoS & q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NQ;$V:s)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )''V}Zn.X  
  //}}AFX_VIRTUAL EaHJl  
  // Implementation uFb 9Ic]`  
 protected: ( ;^>G[  
  HICON m_hIcon; GQJ4d-w  
  // Generated message map functions hQ!59  
  //{{AFX_MSG(CCaptureDlg) En#Q p3  
  virtual BOOL OnInitDialog(); _d!o,=}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $-~"G,;F  
  afx_msg void OnPaint(); ,nCvA%B!  
  afx_msg HCURSOR OnQueryDragIcon(); CWRB/WH:  
  virtual void OnCancel();  +Mhk<A[s  
  afx_msg void OnAbout(); %W2U$I5  
  afx_msg void OnBrowse(); "vQ%` Q  
  afx_msg void OnChange(); rlawH}1b  
 //}}AFX_MSG hW/Ve'x[  
 DECLARE_MESSAGE_MAP() S-ZN}N{,6  
}; w)RedJnf  
#endif _Y/*e<bU  
HZ}Igw.Z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =J]EVD   
#include "stdafx.h" *}';q`u }  
#include "Capture.h" @V:Y%#%  
#include "CaptureDlg.h" osd oL  
#include <windowsx.h> vdQ#C G$/  
#pragma comment(lib,"hook.lib") INp:;  
#ifdef _DEBUG 3 =c#LUA`  
#define new DEBUG_NEW ;m>/tD%  
#undef THIS_FILE wfEL .h  
static char THIS_FILE[] = __FILE__; ~e]B[>PT  
#endif }&v-<qC^  
#define IDM_SHELL WM_USER+1 HwZl"!;Mry  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HC1<zW[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^k$Bx_{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O6 s3#iu  
class CAboutDlg : public CDialog b SgbvnJ  
{ ~k?wnw  
 public: }{=}^c"t'  
  CAboutDlg(); bJ1Nf|3~E  
  // Dialog Data TXXG0 G  
  //{{AFX_DATA(CAboutDlg) {fHY[8su0  
  enum { IDD = IDD_ABOUTBOX }; )bL(\~0g~  
  //}}AFX_DATA n-],!pL^  
  // ClassWizard generated virtual function overrides ? daxb  
  //{{AFX_VIRTUAL(CAboutDlg) 2kDv (".  
 protected: -K(d]-yv  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zlh 2qq  
  //}}AFX_VIRTUAL C& XPn;f  
  // Implementation _j3rs97@|  
 protected: ys>n%24qP  
  //{{AFX_MSG(CAboutDlg)  bKK'U4  
  //}}AFX_MSG %eW7AO>  
  DECLARE_MESSAGE_MAP() Fw{#4  
}; dT% eq7=  
BBGub?(dR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s]0 J'UN  
{ mCk_c  
 //{{AFX_DATA_INIT(CAboutDlg) @ <2y+_e  
 //}}AFX_DATA_INIT rPyjr(I"_  
} iM;Btv[|  
-u<F>C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r79 P|)\  
{ S9 $t9o  
 CDialog::DoDataExchange(pDX); `GY3H3B  
 //{{AFX_DATA_MAP(CAboutDlg) M*D_p n&  
 //}}AFX_DATA_MAP Tp{ jR<  
} 1#7|au%:)  
|4P8N{ L>O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rl~Rbi  
 //{{AFX_MSG_MAP(CAboutDlg) +r//8&  
 // No message handlers <Opw"yY&q]  
 //}}AFX_MSG_MAP (|o @  
END_MESSAGE_MAP() \lQI;b;$  
pc@mQI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y7CO%SA  
: CDialog(CCaptureDlg::IDD, pParent) 4F0w+w JD  
{ 7UG c2J  
 //{{AFX_DATA_INIT(CCaptureDlg) F.i}&UQ%  
  m_bControl = FALSE; +Yq?:uBV  
  m_bAlt = FALSE; W94u7a  
  m_bShift = FALSE; OPE+:TvW^  
  m_Path = _T("c:\\"); dTCLE t.  
  m_Number = _T("0 picture captured."); rr\9HA  
  nCount=0; bma.RCyY<  
  bRegistered=FALSE; 3+d^Bpp4  
  bTray=FALSE; #W|Obc]K  
 //}}AFX_DATA_INIT n 3&h1-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u9~Ncz  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =_iYT044p  
} QRKP;aYt  
*{k{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) IDw`k[k  
{ z"\w9 @W  
 CDialog::DoDataExchange(pDX); ^c(r4#}$"  
 //{{AFX_DATA_MAP(CCaptureDlg) Qbjm,>H/^  
  DDX_Control(pDX, IDC_KEY, m_Key); 1y6<gptx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); htL1aQ.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )4s7,R  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !v=/f_6  
  DDX_Text(pDX, IDC_PATH, m_Path); 50Gu~No6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !\d~9H%`B  
 //}}AFX_DATA_MAP ^>!&]@  
} sb3z8:r  
`MCtm(<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3fpaTue|x  
//{{AFX_MSG_MAP(CCaptureDlg) ]+a~/  
 ON_WM_SYSCOMMAND() I3r")}P  
 ON_WM_PAINT() O;V^Fk(  
 ON_WM_QUERYDRAGICON() &[j9Up'   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ')yYpWO  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Vj1V;dHv  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ml^=y~J[  
//}}AFX_MSG_MAP tN4&#YK<  
END_MESSAGE_MAP() Sw; kUJ  
Fq <JxamR  
BOOL CCaptureDlg::OnInitDialog() I~YV&12  
{ i M MKA0JM  
 CDialog::OnInitDialog(); j7a }<\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _unoDoB  
 ASSERT(IDM_ABOUTBOX < 0xF000); cpw=2vnD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;Gn>W+Ae M  
 if (pSysMenu != NULL) 4I2:"CK06  
 { pCo3%(  
  CString strAboutMenu; 6'e^np  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /AOGn?Z3  
  if (!strAboutMenu.IsEmpty()) 'm |T"Ym~  
  { bo<.pK$  
   pSysMenu->AppendMenu(MF_SEPARATOR); IgwHC0W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &nVekE:!  
  } D4y!l~_,%M  
 } +HWFoK  
 SetIcon(m_hIcon, TRUE); // Set big icon FNOsw\Bo  
 SetIcon(m_hIcon, FALSE); // Set small icon 5bXpj86mY  
 m_Key.SetCurSel(0); {g`!2"  
 RegisterHotkey(); +]-'{%-zK  
 CMenu* pMenu=GetSystemMenu(FALSE); ik)u/r DW  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [N~-9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); YqWNp  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 09P2<oFLn  
 return TRUE; // return TRUE unless you set the focus to a control u9,dSR  
} 1'(";  0I  
d/Wp>A@dob  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) W-|C K&1  
{ <P0 P*>M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) eg?p)|  
 { fr04nl  
  CAboutDlg dlgAbout; ;vPFRiFK  
  dlgAbout.DoModal(); K re*~ "  
 } eFf9T@  
 else 5izpQ'>  
 { m*jE\+)=^  
  CDialog::OnSysCommand(nID, lParam); T]1.":   
 } )=#Js<&3:  
} xZ%3e sp  
K8-1?-W  
void CCaptureDlg::OnPaint() # c1LOz  
{ 5Rw2/J L  
 if (IsIconic()) e:4,rfF1  
 { Y?0x/2<  
  CPaintDC dc(this); // device context for painting JBOU$A ~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Lk$Mfm5"M  
  // Center icon in client rectangle mC\<fo-u  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?6ssSjR}  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;w]1H&mc*A  
  CRect rect; 9eP*N(m<  
  GetClientRect(&rect); aQY.96yo  
  int x = (rect.Width() - cxIcon + 1) / 2; XVfUr\=,T  
  int y = (rect.Height() - cyIcon + 1) / 2; 9 ;uw3vI%  
  // Draw the icon [N%InsA9k  
  dc.DrawIcon(x, y, m_hIcon); Gl3g.`X{$@  
 } j"TEp$x  
 else CKFr9bT{  
 { sh`3${  
  CDialog::OnPaint(); |Thm5,ao  
 } . uGne  
} ,\3Cq2h  
Qh Rj*,  
HCURSOR CCaptureDlg::OnQueryDragIcon() <6hs<qXqi  
{ nTs\zikP  
 return (HCURSOR) m_hIcon; r oG<2i F  
} b5jD /X4  
| a i#rU  
void CCaptureDlg::OnCancel() >QN-K]YLL  
{ ,-k?"|tQ  
 if(bTray) "d~<{(:N^  
  DeleteIcon(); jVGAgR=[G  
  CDialog::OnCancel(); %yKcp5_  
} vmOye/?k  
0;=]MEk?  
void CCaptureDlg::OnAbout() 47*2QL^zj  
{ E#tfCM6  
 CAboutDlg dlg; !nsr( 7X2  
 dlg.DoModal(); Xq37:E2  
} ?aBAmyxm  
[5-Ik T0  
void CCaptureDlg::OnBrowse() g26_#4 P  
{ H|j]uLZ  
 CString str; '|v<^EH  
 BROWSEINFO bi; -H[@]Q4w  
 char name[MAX_PATH]; mAIl)mq|g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2Z<S^9O9  
 bi.hwndOwner=GetSafeHwnd(); KMfRMc&  
 bi.pszDisplayName=name; o@j!JI&  
 bi.lpszTitle="Select folder"; =Ov,7<8o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [ 4IqHe  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~=HPqe8  
 if(idl==NULL) Sa.nUj{M=  
  return; SbMRrWy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); JW2f 6!b  
 str.ReleaseBuffer(); nDckT+eJ  
 m_Path=str; l$l6,OzS@  
 if(str.GetAt(str.GetLength()-1)!='\\') g2LvojR  
  m_Path+="\\"; ;BWWafZ  
 UpdateData(FALSE); }lJ|nl`c  
} eDNY|}$}v  
=*+f2  
void CCaptureDlg::SaveBmp() Iw#[K  
{ <bhJ>  
 CDC dc; >nK (  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RASk=B  
 CBitmap bm; TBF{@{.d  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,1<6=vL  
 int Height=GetSystemMetrics(SM_CYSCREEN); OzRo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w+!V,lU"^  
 CDC tdc; rXTdhw?+  
 tdc.CreateCompatibleDC(&dc); "av/a   
 CBitmap*pOld=tdc.SelectObject(&bm); e9S*^2;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g}9heR  
 tdc.SelectObject(pOld); [6.<#_~{  
 BITMAP btm; #zSNDv`  
 bm.GetBitmap(&btm); h.- o$+Sa  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =bvLMpa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qf [J-"o  
 BITMAPINFOHEADER bih; vt(n: Xk  
 bih.biBitCount=btm.bmBitsPixel; PT&qys 2k  
 bih.biClrImportant=0; @&Yl'&pn-R  
 bih.biClrUsed=0; {ynI]Wj`L  
 bih.biCompression=0; v6x jLP;O  
 bih.biHeight=btm.bmHeight; 33hP/p%  
 bih.biPlanes=1; m#6p=E  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~e){2_J&n  
 bih.biSizeImage=size; b1=! "Y@  
 bih.biWidth=btm.bmWidth; 56NDU>j$  
 bih.biXPelsPerMeter=0;  _qt  
 bih.biYPelsPerMeter=0; YVz,P_\(m  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); SST@   
 static int filecount=0; ^tjM1uaZ5(  
 CString name; (0?FZ.9%  
 name.Format("pict%04d.bmp",filecount++); 2U+Fa t@  
 name=m_Path+name; i8R 2Y9Q*O  
 BITMAPFILEHEADER bfh; lq  Av  
 bfh.bfReserved1=bfh.bfReserved2=0; Nlc3S+$`z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); NcSi%]  
 bfh.bfSize=54+size; 1mfB6p1Z(  
 bfh.bfOffBits=54; 'Q*lp!2>  
 CFile bf; XwU1CejP0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $Nj'_G\}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); />PH{ l  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8N#.@\'kz.  
  bf.WriteHuge(lpData,size); >7W8_6sC<  
  bf.Close(); Gh%dVP9B@P  
  nCount++; 8<E U|/O  
 } :FS~T[C;  
 GlobalFreePtr(lpData); d,j)JnY3V  
 if(nCount==1) gG(9&}@(  
  m_Number.Format("%d picture captured.",nCount); # .OCoc  
 else kCoEdQ_  
  m_Number.Format("%d pictures captured.",nCount); ah!RQ2hDrV  
  UpdateData(FALSE); 2&o3OKt  
} jgYe\dinM  
F22]4DLHO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H}1XK|K3#H  
{ UM+g8J{$*;  
 if(pMsg -> message == WM_KEYDOWN) >-`-D=!V  
 { 6?0QzSpfC#  
  if(pMsg -> wParam == VK_ESCAPE) cI <T/~P  
   return TRUE; c+1<3)Q<  
  if(pMsg -> wParam == VK_RETURN) eE0nW+i  
   return TRUE; \9:IL9~F  
 } s=#[>^?  
 return CDialog::PreTranslateMessage(pMsg); *zX^Sg-[  
} jH9.N4L  
P&Hhq>@Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R}OjSiS\  
{ 6:G ::"ew  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eGbjk~,f'  
  SaveBmp(); (xBWxeL~  
  return FALSE; k]A$?C0Q<%  
} {r?Ly15  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M_;hfpJZ  
 CMenu pop; N#X(gEV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); RUV:   
 CMenu*pMenu=pop.GetSubMenu(0); j5 W)9HW:  
 pMenu->SetDefaultItem(ID_EXITICON); il:RE8  
 CPoint pt; vH?3UW  
 GetCursorPos(&pt); YJ01-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >#xIqxV,  
 if(id==ID_EXITICON) ?NUDHUn_  
  DeleteIcon(); iN+&7#x;/  
 else if(id==ID_EXIT) 5jcy*G}[  
  OnCancel(); 3 DZ8-N S  
 return FALSE; j sw0"d(  
} >t $^U  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 |Rmb  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &[-b #&y  
 AddIcon(); t hQ)J|1  
 return res; T`Qg+Q$  
} R"JT+m  
(V8lmp-F  
void CCaptureDlg::AddIcon() {F*81q\  
{ Q$^Kf]pD  
 NOTIFYICONDATA data; fq[,9lK  
 data.cbSize=sizeof(NOTIFYICONDATA); 9m2Yrj93  
 CString tip; )^Md ^\?  
 tip.LoadString(IDS_ICONTIP); /2]=.bLwz  
 data.hIcon=GetIcon(0); SBG.t:  
 data.hWnd=GetSafeHwnd(); Lq5Eu$;r  
 strcpy(data.szTip,tip); zT _[pa)O`  
 data.uCallbackMessage=IDM_SHELL; 77zDHq=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )Yw m_f-N  
 data.uID=98; X>s'_F?  
 Shell_NotifyIcon(NIM_ADD,&data); ! d" i  
 ShowWindow(SW_HIDE); :*E#w"$,j  
 bTray=TRUE; koOp:7r  
} kQ $.g<  
jb!15Vlt"  
void CCaptureDlg::DeleteIcon() UE%~SVi.#  
{ lRA!  
 NOTIFYICONDATA data; 83gp'W{|  
 data.cbSize=sizeof(NOTIFYICONDATA); 2S_7!|j  
 data.hWnd=GetSafeHwnd(); VaFv%%w  
 data.uID=98; H=>;M j  
 Shell_NotifyIcon(NIM_DELETE,&data); Xx=c'j<  
 ShowWindow(SW_SHOW); :|E-Dx4F6H  
 SetForegroundWindow(); P }$DCD<$U  
 ShowWindow(SW_SHOWNORMAL); ZklZU,\!|v  
 bTray=FALSE; %0^taA  
} ch:0qgJ  
oxgh;v*  
void CCaptureDlg::OnChange() UhF+},gU  
{ sT%^W  
 RegisterHotkey(); $@4(Lq1.  
} uSn<]OrZo`  
<S`N9a  
BOOL CCaptureDlg::RegisterHotkey() $_0~Jzt,  
{ ]$ iqJL  
 UpdateData(); ; Uf]-uS  
 UCHAR mask=0; >KnXj7  
 UCHAR key=0; ]tDuCZA  
 if(m_bControl) ?Y#x`DMh  
  mask|=4; a2`|6M;  
 if(m_bAlt) ;kiL`K  
  mask|=2; 5o R/Q|^  
 if(m_bShift) hS7o=G[  
  mask|=1; -PH!U Hg  
  key=Key_Table[m_Key.GetCurSel()]; aYPD4yX"/  
 if(bRegistered){ H+2m  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t"L-9kCM  
  bRegistered=FALSE; e8ZMB$byP  
 } p7d[)* L>C  
 cMask=mask; *^ -~J/  
 cKey=key; >$iQDVh!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j69 2M.A  
 return bRegistered; BF(.^oh"n0  
} DAtZp%  
|dQ-l !  
  四、小结 vB9v8@[I&  
}O7b&G:nW  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八