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:
y{&{=1#
IL8'{<lM 一、实现方法
'/gxjr& ~:ub 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:
:JTRRv mlsvP%[f. #pragma data_seg("shareddata")
/Gh
x2B HHOOK hHook =NULL; //钩子句柄
ZYl-p]\*y UINT nHookCount =0; //挂接的程序数目
cAsSN.HFS static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
?vL^:f[" static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
FEm1^X#] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
+Zty}fe static int KeyCount =0;
z$8e6* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
5W:Gl?$S} #pragma data_seg()
0s+rd& 's7 SZ$( 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
M Z|c7f&` 6a 2w-}Fs DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
^,ZvKA"}+/ E:dT_x<Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=oKPMmpCZ cKey,UCHAR cMask)
fd,}YAiX {
]VHdE_7) BOOL bAdded=FALSE;
^}Dv$\;6 for(int index=0;index<MAX_KEY;index++){
tswG"1R if(hCallWnd[index]==0){
/%}YuN hCallWnd[index]=hWnd;
^c[CyZ:a HotKey[index]=cKey;
&a2V-|G', HotKeyMask[index]=cMask;
#IL~0t bAdded=TRUE;
wzLiVe- KeyCount++;
&s6(3k break;
*fuGVA }
A]~i uUHm }
Do[ F+Y return bAdded;
,uqbS }
t6,M //删除热键
yrK--C8 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
fi-&[llg {
|Z^c#R BOOL bRemoved=FALSE;
f'zFg["aZS for(int index=0;index<MAX_KEY;index++){
(>Q9jNW if(hCallWnd[index]==hWnd){
E6wST@r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"`1of8$X7 hCallWnd[index]=NULL;
;Cp/2A}Xx HotKey[index]=0;
* v7& T HotKeyMask[index]=0;
iw]BQjK bRemoved=TRUE;
oE|{|27X KeyCount--;
C{I8Pio{b break;
EuimZW\V }
X-2S*L' }
Xm:gD6;9 }
krnk%ug return bRemoved;
!^"!fuoNC }
nY5n%>8 $nd-[xV O'sr[ DLL中的钩子函数如下:
r@@eC[' $P}]|/Yb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
yOCcp+`T} {
a518N*]j BOOL bProcessed=FALSE;
XGup,7e9 if(HC_ACTION==nCode)
m=y,_Pz>U {
OaCj3d> if((lParam&0xc0000000)==0xc0000000){// 有键松开
/*p?UW<*4 switch(wParam)
D(ntVR {
8!fAv$g0 case VK_MENU:
&+r
;> MaskBits&=~ALTBIT;
9oau_Q# break;
!vo '8r?& case VK_CONTROL:
ZtK%b+MBP MaskBits&=~CTRLBIT;
U@t?jTMBkO break;
$=g.-F%*= case VK_SHIFT:
6%hEs6-R MaskBits&=~SHIFTBIT;
' ^L break;
D30Z9_^%: default: //judge the key and send message
;NVTn<Uj break;
O}iKPY8K }
w#bbm'j7r for(int index=0;index<MAX_KEY;index++){
xA1pDrfC/ if(hCallWnd[index]==NULL)
% |Gzht\ continue;
@_:?N(%( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X%\6V;zR# {
](6vG$\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
i$<v*$.o bProcessed=TRUE;
C]cT*B^ }
Q_h+r!b }
cw-JGqLx }
52R.L9Ai else if((lParam&0xc000ffff)==1){ //有键按下
+q?0A^C> switch(wParam)
dE!=a|Pl {
~ilBw:L-3 case VK_MENU:
d1_*!LW$ MaskBits|=ALTBIT;
7Z :l;%]K break;
$,v+i
- case VK_CONTROL:
.xQ'^P_q MaskBits|=CTRLBIT;
T1W9@9,s break;
RpXG gw case VK_SHIFT:
^9~%=k= MaskBits|=SHIFTBIT;
~=]@],{ break;
H4",r5qw: default: //judge the key and send message
:h dh$}y break;
[*E.G~IS` }
BQmafpp` for(int index=0;index<MAX_KEY;index++){
z`{zqP: if(hCallWnd[index]==NULL)
-.3k
vL continue;
3$f5][+U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
90k|u'ikOp {
kF~e3A7C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
H LGy"P bProcessed=TRUE;
Fd.d( }
mK/P4]9g }
+W[#;)ea( }
,+evP=(cX if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&!fcL Jd for(int index=0;index<MAX_KEY;index++){
RLX^'g+P if(hCallWnd[index]==NULL)
A>@epCD continue;
mV]g5>Q\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7}85o
J SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
``CADiM:S //lParam的意义可看MSDN中WM_KEYDOWN部分
nECf2>Yp v }
pC
Is+1O/ }
`;GGuJb \ }
)f&]H} return CallNextHookEx( hHook, nCode, wParam, lParam );
QP0X8%+p }
@x
]^blq l[{}ZKZ 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:
84cH|j`w rmJ847%y` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{-qTU6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}-iOYSn sUMn
(@r 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:
JPKZU<:+V P#oV ^ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?"u-@E[m {
iP_Xr~w if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
(j"MsCwE {
>1zzDd_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
fdHxrH>* SaveBmp();
5nb6k,+E return FALSE;
T+!kRigN~P }
IbwRb …… //其它处理及默认处理
7?#32B
Gr }
o|C{ s !7?wd^C'f ~cwwB{ 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。
^q2zqC 3Re\ T 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。
BT0hx!Ti 5)6%D 二、编程步骤
Ba~Iy2\x X:/t>0e 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";
}C}_
I:=C D3ad2vH 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`;@4f|N9 =Y[Ae7e 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;
b"9,DQB=i DcHMiiVM 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;
1fZ:^|\ xM\ApN~W 5、 添加代码,编译运行程序。
8?XZF[D >j3N-;o@? 三、程序代码
v^'~-^s
nrBitu, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
2O/_hv. #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
_#B/#^a #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
|&7,g #if _MSC_VER > 1000
Y[4B{ #pragma once
(z7#KJ1+Aw #endif // _MSC_VER > 1000
-&}E:zoe
#ifndef __AFXWIN_H__
%\0 Y1!Hw #error include 'stdafx.h' before including this file for PCH
3FN? CN] O #endif
|#6Lcz7[ #include "resource.h" // main symbols
_(foJRr class CHookApp : public CWinApp
$}fA;BP {
KG$2u:n public:
u7d]%<~'$F CHookApp();
}__+[- // Overrides
>^&+,*tsS4 // ClassWizard generated virtual function overrides
bSfQH4F //{{AFX_VIRTUAL(CHookApp)
\Z':hw public:
Sqs`E[G* virtual BOOL InitInstance();
pyKag;ZtP virtual int ExitInstance();
{W]jVh p //}}AFX_VIRTUAL
t=AR>M!w~ //{{AFX_MSG(CHookApp)
}T,uw8?f! // NOTE - the ClassWizard will add and remove member functions here.
9&cZIP // DO NOT EDIT what you see in these blocks of generated code !
gZ3!2T> //}}AFX_MSG
e^ yB9b DECLARE_MESSAGE_MAP()
4KCxhJq };
$]FWpr%) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
VM[8w` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.+>}}, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3nO|A: t BOOL InitHotkey();
o9i\[Ul BOOL UnInit();
h.*|4; #endif
8T4J^6 3>+;G4 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
&,zeBFmc #include "stdafx.h"
hlRE\YO&8R #include "hook.h"
T (qu~} #include <windowsx.h>
Lmb<)YY #ifdef _DEBUG
%[J( ,rm #define new DEBUG_NEW
F~1R.r_Lu #undef THIS_FILE
`f'P static char THIS_FILE[] = __FILE__;
:R)IaJ6) #endif
Qxwe,: #define MAX_KEY 100
W4<}w-AoEp #define CTRLBIT 0x04
x+pFu5, #define ALTBIT 0x02
{%
P;O ?
#define SHIFTBIT 0x01
(rJvE* #pragma data_seg("shareddata")
D)5wGp HHOOK hHook =NULL;
fOVRtSls UINT nHookCount =0;
{-xnBx static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
}49?Z 3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!duR7a static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`d8TA#|` static int KeyCount =0;
tVO x static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
<~d N23) #pragma data_seg()
DsoF4&>g[B HINSTANCE hins;
:9<5GF( void VerifyWindow();
CVm*Q[5s" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
G.Q+"+*^ //{{AFX_MSG_MAP(CHookApp)
zSu2B6YU} // NOTE - the ClassWizard will add and remove mapping macros here.
,0~=9dR // DO NOT EDIT what you see in these blocks of generated code!
yZ`\.GgC^& //}}AFX_MSG_MAP
"k.<" pf END_MESSAGE_MAP()
rZLMYM ~L2Fo~fw CHookApp::CHookApp()
C
RNO4 {
}5K\l
// TODO: add construction code here,
t?\osPL // Place all significant initialization in InitInstance
m\(a{x }
PYZ8@G Q8_d]V=X: CHookApp theApp;
8g3 6-8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R#0UwRjeF {
%EuSP0 BOOL bProcessed=FALSE;
t4h* re+ if(HC_ACTION==nCode)
E:2Or~ {
2n\EZ if((lParam&0xc0000000)==0xc0000000){// Key up
="V6z$N switch(wParam)
^Kn}{m/3Y {
>1YJETysO case VK_MENU:
`sSI; + MaskBits&=~ALTBIT;
@ Fu|et break;
CGQ`i case VK_CONTROL:
~!I
\{( MaskBits&=~CTRLBIT;
Yv>% 5` break;
d4lEd>Ni case VK_SHIFT:
nk[ixVc MaskBits&=~SHIFTBIT;
WkT4&|POJ break;
8{AzB8xp default: //judge the key and send message
a$ Z06j break;
8IO4>CMkv }
,+WDa%R for(int index=0;index<MAX_KEY;index++){
_T1|_9b if(hCallWnd[index]==NULL)
)gZ yW
continue;
8q_nOGd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\j4TDCs_[ {
cf96z|^C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Au9Rr3n bProcessed=TRUE;
$. Ih- }
Z\n
nVM= }
%5'6^bT }
:AL
nm0d else if((lParam&0xc000ffff)==1){ //Key down
+5voAx! switch(wParam)
3qP!
(* {
zpJQ7hym case VK_MENU:
/>H9T[3= MaskBits|=ALTBIT;
}5EvBEv-) break;
1jDN=hIl case VK_CONTROL:
F.4xi+S_ MaskBits|=CTRLBIT;
0`:0m/fsU break;
Tv!zqx#E case VK_SHIFT:
af)L+%Q%R MaskBits|=SHIFTBIT;
8K'3iw>z break;
"d%o% default: //judge the key and send message
*y0TtEd; break;
`Ps&N^[ }
voiWf?X for(int index=0;index<MAX_KEY;index++)
RGsgT ^ {
1
Qln|b8< if(hCallWnd[index]==NULL)
xQ%N%
` continue;
y2KR^/LN|Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0l;TZf=H {
/@ m]@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@cukoLAn bProcessed=TRUE;
Fsz;T; }
G0)}?5L1J }
~7ZWtg;B }
$i1$nc8 if(!bProcessed){
L xP%o for(int index=0;index<MAX_KEY;index++){
^M0 if(hCallWnd[index]==NULL)
^VOFkUp) continue;
1
8%+ Hy= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#Pt_<?JtV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>P@g].Q- }
E6XDn`: }
TophV}@B` }
jl9hFubwW return CallNextHookEx( hHook, nCode, wParam, lParam );
4K5 }
41g
"7Mk >e^bq/' BOOL InitHotkey()
Np7+g`nG {
7vTzY%v if(hHook!=NULL){
KrdEB0qh nHookCount++;
9:R3+,ZN return TRUE;
zG{P5@:.R }
L+N\B@ 0- else
e.\dqt~%y hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
8yk7d76Y if(hHook!=NULL)
t'1g+g nHookCount++;
;* QK^ # return (hHook!=NULL);
,oykOda:| }
zzK<>@c BOOL UnInit()
)pSA|Qt N {
JR8|!Of@B if(nHookCount>1){
zZ6m`]{B9? nHookCount--;
By waD? return TRUE;
djH&)&q! }
q
#mBNe62p BOOL unhooked = UnhookWindowsHookEx(hHook);
kDol 1v` if(unhooked==TRUE){
?Z2`8]-E nHookCount=0;
,Qx]_gZ` hHook=NULL;
Ge_fU'F }
~7 `,}) d return unhooked;
p#).;\M }
/poGhB1k elAWQE us BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@Ddz|4 vEi {
FRuPv6 BOOL bAdded=FALSE;
((C|&$@M for(int index=0;index<MAX_KEY;index++){
tL3R<' if(hCallWnd[index]==0){
|QS3nX< hCallWnd[index]=hWnd;
Li]bU HotKey[index]=cKey;
b"uO BB HotKeyMask[index]=cMask;
rRg,{:;A bAdded=TRUE;
EjL]#,QR KeyCount++;
hw,nA2w\ break;
md*U }
s3eS` rK- }
gUNhN1= return bAdded;
LD ]-IX&L }
?h6|N%U' pJx7S sW BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_tJt
eDRY {
Ym1vq= BOOL bRemoved=FALSE;
4XNheP;b for(int index=0;index<MAX_KEY;index++){
K fD.J) if(hCallWnd[index]==hWnd){
~4khIz if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@QV0l]H0+ hCallWnd[index]=NULL;
I%u 2 ce HotKey[index]=0;
@Wc5r# HotKeyMask[index]=0;
._^}M<o L bRemoved=TRUE;
&nP0T-T5y KeyCount--;
KEtV break;
uG^CyM>R` }
[EDX@Kdq) }
iI{L>
}
2uOYuM[7gH return bRemoved;
5>I-? Ki }
jd](m:eG B~w$j/sWU void VerifyWindow()
4~,Z ' k {
~.aR=m\#
for(int i=0;i<MAX_KEY;i++){
!\X9$4po@ if(hCallWnd
!=NULL){ R3~,&ab
if(!IsWindow(hCallWnd)){ 1ZI1+TDH
hCallWnd=NULL; <%m YsaM
HotKey=0; q2*A'C
HotKeyMask=0; m,lZy#02s3
KeyCount--; iX$G($[l(
} [3jJQ3O,
} =0pt-FQ
} |Y>Jf~SN
} SLKplLO
7v*gwBH
BOOL CHookApp::InitInstance() 5dm ~yQN/
{ V4+|D2
AFX_MANAGE_STATE(AfxGetStaticModuleState()); YI g(^>sq
hins=AfxGetInstanceHandle(); 5tYo! f
InitHotkey(); }:0_%=)N<
return CWinApp::InitInstance(); `gX|q3K\s
} hx9{?3#
J,F1Xmr4
int CHookApp::ExitInstance() 2aj1IBnz6/
{ ,AP0*Ln
VerifyWindow(); Nap[=[rv
UnInit(); }|.<EkA
return CWinApp::ExitInstance(); &BRk<iwV
} wtw=RA
`,qft[1
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4j#y?^s
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {y9G
"
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d=D-s
#if _MSC_VER > 1000 XwY,xg&o
#pragma once
)0VL$A
#endif // _MSC_VER > 1000 8K,X3a9
Az&>.*
class CCaptureDlg : public CDialog ;7'O=%
{ {DRk{>K,
// Construction PVI Oe}N
public: P8eCaZg?(3
BOOL bTray; qX,q*hr-
BOOL bRegistered; V&*IZt&
BOOL RegisterHotkey(); ~*HQPp?v
UCHAR cKey; aJ'Fn
UCHAR cMask; W/qXQORv
void DeleteIcon(); MgXZN{
void AddIcon(); AY /9Io-
UINT nCount; "w:h
void SaveBmp(); ?()*"+N(ck
CCaptureDlg(CWnd* pParent = NULL); // standard constructor dKzG,/1W[m
// Dialog Data $
VT)
//{{AFX_DATA(CCaptureDlg) M+ +Dk7B
enum { IDD = IDD_CAPTURE_DIALOG }; zjmoIE
CComboBox m_Key; tu\XuDky
BOOL m_bControl; 8 0tA5AP
BOOL m_bAlt; wW%b~JX
BOOL m_bShift; ~<[+!&<U
CString m_Path; t]h_w7!U
CString m_Number; GHsDZ(d3.
//}}AFX_DATA NNt n
// ClassWizard generated virtual function overrides 74([~Qs _M
//{{AFX_VIRTUAL(CCaptureDlg) " .7@
public: ji/`OS-iq
virtual BOOL PreTranslateMessage(MSG* pMsg); W`[VLi}fe
protected: U1YqyG8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k8s)PN
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); B
~v6_x
//}}AFX_VIRTUAL Xh8U}w<k6
// Implementation "9;
protected: jwI2T$
HICON m_hIcon; .\oz
// Generated message map functions nE]rPRU}[
//{{AFX_MSG(CCaptureDlg) K*:=d}^
virtual BOOL OnInitDialog(); QD-\'Bp/X
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /dCsZA
afx_msg void OnPaint(); jkk%zu
afx_msg HCURSOR OnQueryDragIcon(); OLx;j+p
virtual void OnCancel(); EB3/o7)L
afx_msg void OnAbout(); Zf$mwRS[_
afx_msg void OnBrowse(); [A~?V.G
afx_msg void OnChange(); Ce+:9} [
//}}AFX_MSG Mi.#x_
DECLARE_MESSAGE_MAP() dk7x<$h-h0
}; e#oK%
{A
#endif G8}owszT
6w%n$tiX
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;MQl.?vj
#include "stdafx.h" l;q]z
#include "Capture.h" H^'%$F?Ss
#include "CaptureDlg.h" N8nt2r<h
#include <windowsx.h> uihH")Mo
#pragma comment(lib,"hook.lib") Z(q]rX5"
#ifdef _DEBUG p-j6H
#define new DEBUG_NEW ! VT$U6
#undef THIS_FILE S:z|"u:+
static char THIS_FILE[] = __FILE__; ;=joQWNDm
#endif 3/gR}\=
#define IDM_SHELL WM_USER+1 .c>6}:ye
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3[Q7'\
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1V]ws}XW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3D6&0xTq
class CAboutDlg : public CDialog <<-L,0
{ %<^^ Mw
public: B9,39rG/7+
CAboutDlg(); {_!,T%>+1
// Dialog Data -~c-mt
//{{AFX_DATA(CAboutDlg) g(zeOS]q}
enum { IDD = IDD_ABOUTBOX }; 3rK\
f4'
//}}AFX_DATA ;39b.v\^
// ClassWizard generated virtual function overrides ]-t>F
//{{AFX_VIRTUAL(CAboutDlg) )@9Eq|jMC
protected: 1>[#./@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jW7ffb
`O
//}}AFX_VIRTUAL Y*#xo7#B
// Implementation (Q*x"G#4>
protected: 9Tr ceL;
//{{AFX_MSG(CAboutDlg) R1SFMI
//}}AFX_MSG o6^ETQ
DECLARE_MESSAGE_MAP() jv v=
}; auGK2i
-'O|D}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HPu+ 4xQV
{ khjdTq\\
//{{AFX_DATA_INIT(CAboutDlg) [^GBg>k
//}}AFX_DATA_INIT :YRHO|
} w;Azxcw
` Ft-1eE
void CAboutDlg::DoDataExchange(CDataExchange* pDX) IG|u;PH<
{ YFu>`w^Y
CDialog::DoDataExchange(pDX); .h4NG4FIF
//{{AFX_DATA_MAP(CAboutDlg) 3{.]!
//}}AFX_DATA_MAP M]X!D7
} P0; y
:LB*l5\
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CT_tJ
//{{AFX_MSG_MAP(CAboutDlg) n CwA8AG
// No message handlers R`$Y]@i&B
//}}AFX_MSG_MAP S]=.p-Am
END_MESSAGE_MAP() G11KAq(
gFuK/]gzI
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #5h_{q4l
: CDialog(CCaptureDlg::IDD, pParent) ,d*1|oUw
{ 8&HBR #
//{{AFX_DATA_INIT(CCaptureDlg) ~$>JYJj
m_bControl = FALSE; <V}q8k
m_bAlt = FALSE; 1`|Z8Jpocj
m_bShift = FALSE; L<oQKe7Q:
m_Path = _T("c:\\"); :FU?vh$)
m_Number = _T("0 picture captured."); 1P"{TMd?
nCount=0; 117lhx].'
bRegistered=FALSE; HCrQ+r{g
bTray=FALSE; '\d
ldg#P
//}}AFX_DATA_INIT Lp"OXJ*es
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <uBRLe`)
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?7)v:$(G}
} LH}9&FfjU
|15!D
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) rSt5@f?
{ '_7rooU9
CDialog::DoDataExchange(pDX); R+ \%
//{{AFX_DATA_MAP(CCaptureDlg) EKcPJ\7
DDX_Control(pDX, IDC_KEY, m_Key); NAtDt=
DDX_Check(pDX, IDC_CONTROL, m_bControl); k4<28
DDX_Check(pDX, IDC_ALT, m_bAlt); 6ERMn"[_w
DDX_Check(pDX, IDC_SHIFT, m_bShift); 8pA<1H%
DDX_Text(pDX, IDC_PATH, m_Path); .czUJyFms}
DDX_Text(pDX, IDC_NUMBER, m_Number); nu+^D$ait
//}}AFX_DATA_MAP ha;fxM]
} `peR ,E
Kyk{:UnI
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) e <{d{
//{{AFX_MSG_MAP(CCaptureDlg) OAiW8BAe
ON_WM_SYSCOMMAND() E0 VAhN3G\
ON_WM_PAINT() p{_*<"cfYn
ON_WM_QUERYDRAGICON() ny+r>>3Td
ON_BN_CLICKED(ID_ABOUT, OnAbout) NTX0vQG
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S?`0,F
ON_BN_CLICKED(ID_CHANGE, OnChange) Z2g<"M
//}}AFX_MSG_MAP aY,Bt
END_MESSAGE_MAP() u"oO._a(
$ S3b<]B
BOOL CCaptureDlg::OnInitDialog() XNx$^I=
{ 3^&`E}r
CDialog::OnInitDialog(); ;CS[Ja>e
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8Uh|V&
ASSERT(IDM_ABOUTBOX < 0xF000); *XWu) >*o
CMenu* pSysMenu = GetSystemMenu(FALSE); 6~ y'
if (pSysMenu != NULL) aj|PyX3P:
{ F-o?tU
CString strAboutMenu; Ebj0 {ZL
strAboutMenu.LoadString(IDS_ABOUTBOX); *re?V9
if (!strAboutMenu.IsEmpty()) 3)CIqN
{ nG5\vj,zB
pSysMenu->AppendMenu(MF_SEPARATOR); 4?@#w>(
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E <j=5|0t
} ZRc^}5}WA
} 4<}@hk
Y
SetIcon(m_hIcon, TRUE); // Set big icon "]p&7
SetIcon(m_hIcon, FALSE); // Set small icon YwY?tOxBe
m_Key.SetCurSel(0); D}}?{pe
RegisterHotkey(); ?-Of\fNu
CMenu* pMenu=GetSystemMenu(FALSE); BcpbS%S
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0&|M/
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }oG6XI9
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); C_ d|2C6
return TRUE; // return TRUE unless you set the focus to a control ]Z\ W%'q+
} oF+yh!~mM
G6>sAOf
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c8
{ %YF
/=l
if ((nID & 0xFFF0) == IDM_ABOUTBOX) fk?!0M6d
{ WhH60/`
CAboutDlg dlgAbout; Cb<7?),vK
dlgAbout.DoModal(); !.V_?aYi8
} By!u*vSev
else Ufi#y<dP
{ Jn|<G
CDialog::OnSysCommand(nID, lParam); n{<@-6
} q3/4l%"X
} : Gi8Jo
=z9,=rR4
void CCaptureDlg::OnPaint() ./7-[d
{ }0H<G0
if (IsIconic()) mP15PZ
{ "N&ix*($
CPaintDC dc(this); // device context for painting rttKj{7E
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
&``nD
// Center icon in client rectangle 5Y`4%*$
int cxIcon = GetSystemMetrics(SM_CXICON); B$s6|~
int cyIcon = GetSystemMetrics(SM_CYICON); #>_fYjT
CRect rect; @(x]+*)
GetClientRect(&rect); ;XZN0A2
int x = (rect.Width() - cxIcon + 1) / 2; Dn#5H{D-d
int y = (rect.Height() - cyIcon + 1) / 2; f`>\bdz
// Draw the icon #LR6wEk
dc.DrawIcon(x, y, m_hIcon); tZ@&di:-F
}
O\yYCi(
else c; .y
{ q |Pebe=
CDialog::OnPaint(); j;j~R3B
} 5B8/"G
} zTG1 0
Lnn^j#n
HCURSOR CCaptureDlg::OnQueryDragIcon() ^"/TWl>jB
{ Wx;%W"a
return (HCURSOR) m_hIcon; 5$Kv%U
} (1er?4
A9DFZZ0
void CCaptureDlg::OnCancel() vft7-|8T
{ mpDxJk!
if(bTray) F!C<^q~!
DeleteIcon(); 5f@&XwD9
CDialog::OnCancel(); FRPdfo37
} !VG
]~lc
V~o'L#a
void CCaptureDlg::OnAbout() w[QC
{ \:n<&<aVSr
CAboutDlg dlg; i}<fg*6@E
dlg.DoModal(); )&)tX.
} Y3)*MqZlF
DYZk1
void CCaptureDlg::OnBrowse() @WKJ7pt`'N
{ \)MzUOZn
CString str; vHPsHy7y
BROWSEINFO bi; a[!:`o1U
char name[MAX_PATH]; XK0lv8(
ZeroMemory(&bi,sizeof(BROWSEINFO)); daQJ{Cd,w
bi.hwndOwner=GetSafeHwnd(); fE>JoQs38
bi.pszDisplayName=name; `v/p4/
bi.lpszTitle="Select folder"; eVbT<9k
bi.ulFlags=BIF_RETURNONLYFSDIRS; URr{J}5
LPITEMIDLIST idl=SHBrowseForFolder(&bi); {FN4BC`3+
if(idl==NULL) _t X1z^
return; <\
".6=E#W
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); CA/Lv{[2
str.ReleaseBuffer(); \/Zo*/
m_Path=str; J]NMqiq
if(str.GetAt(str.GetLength()-1)!='\\') \:Hh'-77q
m_Path+="\\"; xWWVU}fd1
UpdateData(FALSE); O `>u70
} E.x<J.[Y
V)oKsO
void CCaptureDlg::SaveBmp() gb^'u
{ gPpk0LZi
CDC dc; [XA:pj;rg'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); CSFE[F63
CBitmap bm; OR10IS
int Width=GetSystemMetrics(SM_CXSCREEN); E,A9+OKxJ
int Height=GetSystemMetrics(SM_CYSCREEN); W=K+kB
bm.CreateCompatibleBitmap(&dc,Width,Height); `my\59T
CDC tdc; QA~Lm
tdc.CreateCompatibleDC(&dc); j W-K
CBitmap*pOld=tdc.SelectObject(&bm); mP
+H
C)2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c#fSt}J>C
tdc.SelectObject(pOld); ;l@Ge`&u
BITMAP btm; ,YrPwdaTB
bm.GetBitmap(&btm); k,/2]{#53d
DWORD size=btm.bmWidthBytes*btm.bmHeight; Gfle"_4m8
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @`SlOKz!=
BITMAPINFOHEADER bih; (%]M a
bih.biBitCount=btm.bmBitsPixel; XE:bYzH
bih.biClrImportant=0; =A/$[POr
bih.biClrUsed=0; "!o|^nN,
bih.biCompression=0; mGUG
bih.biHeight=btm.bmHeight; wqt/0,\
bih.biPlanes=1; l]5!$N*
bih.biSize=sizeof(BITMAPINFOHEADER); vPu{xy
bih.biSizeImage=size; *,XT;h$'>
bih.biWidth=btm.bmWidth; Ke\FzZ]
bih.biXPelsPerMeter=0; >% E=l
bih.biYPelsPerMeter=0; v*@R U
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); };~I#X
static int filecount=0; %wmbFj}
CString name; 1F[W~@jW
name.Format("pict%04d.bmp",filecount++); |+aD%'|
name=m_Path+name; ]7%+SH,RdD
BITMAPFILEHEADER bfh; 'u%SI]*;>
bfh.bfReserved1=bfh.bfReserved2=0; BbNl:`
bfh.bfType=((WORD)('M'<< 8)|'B'); Y:5Gp8Vi
bfh.bfSize=54+size; U 0dhr; l
bfh.bfOffBits=54; vsbD>`I
CFile bf; e:iqv?2t
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (=QiXX1r
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iaQ3mk#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
P{>-MT2E
bf.WriteHuge(lpData,size); -Rr Qv(
bf.Close(); Vs&Ul6@N
nCount++; f:/"OCig
} BGL-lJrG
GlobalFreePtr(lpData); C,dRdEB>
if(nCount==1) M{`uI8vD
m_Number.Format("%d picture captured.",nCount); LhtA]z,m
else axiP~t2
m_Number.Format("%d pictures captured.",nCount);
MVe4[<
UpdateData(FALSE); JO|xX<#:
} oJor
]QY K
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Hu7WU;w
{ [O^mG
9
if(pMsg -> message == WM_KEYDOWN) "5$2b>_UE
{ 6kHb*L Je
if(pMsg -> wParam == VK_ESCAPE) Q`(h
return TRUE; ;Qdw$NuW
if(pMsg -> wParam == VK_RETURN) ?8@EBPpC
return TRUE; -jL10~/
} oa8xuFu(n
return CDialog::PreTranslateMessage(pMsg); V=5v7Y3(j
} t,R4q*
]MV=@T^8#
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j<_)Y(x>
{ TWo.c _l
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3^p;'7x
SaveBmp(); $|!@$A j
return FALSE; oh^QW`#(
} f!+G1z}iA
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dp#'~[ j
CMenu pop; $Rv(v%
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #)EVi7UP
CMenu*pMenu=pop.GetSubMenu(0); !6DH6<HC
pMenu->SetDefaultItem(ID_EXITICON); b0lZb'
CPoint pt; YV/JZc f
GetCursorPos(&pt); XXZ <r
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iP+3)
if(id==ID_EXITICON) ZH8Oidj`
DeleteIcon(); /&g~*AL
else if(id==ID_EXIT) 5Ak6 q(\
OnCancel(); cXG$zwS\
return FALSE; ,lr\XhO
} >p@v'h/Cr
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Pvu*Y0_p
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t{Xf3.
AddIcon(); )MU)'1jc,
return res; },(Ln%M
} v* /}s :a
0X[uXf
void CCaptureDlg::AddIcon() e95@4f^K2
{ VLs%;|`5D
NOTIFYICONDATA data; M|uWSG
data.cbSize=sizeof(NOTIFYICONDATA); *Z
C$DW!-
CString tip; Mg76v<mv<
tip.LoadString(IDS_ICONTIP);
iP^o]4[c
data.hIcon=GetIcon(0); $g+q;Y~i0
data.hWnd=GetSafeHwnd(); m(?ZNtBQt
strcpy(data.szTip,tip); "fX9bh^
data.uCallbackMessage=IDM_SHELL; UCF'%R
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Or*e$uMIY
data.uID=98; a2\r^fY/
Shell_NotifyIcon(NIM_ADD,&data); >lIQM3
ShowWindow(SW_HIDE); {m2lVzK
bTray=TRUE; Ec;{N
} [[;vZ
`'
"125T
void CCaptureDlg::DeleteIcon() l/F'W}
{ EAi!"NJ
NOTIFYICONDATA data; xD3Y-d9
data.cbSize=sizeof(NOTIFYICONDATA); /WWD;keP5
data.hWnd=GetSafeHwnd(); {X'D07 q
data.uID=98; Y] "_}
Shell_NotifyIcon(NIM_DELETE,&data); OD\F*Ry~
ShowWindow(SW_SHOW); fKN&0N|^R
SetForegroundWindow(); 3iC$ "9!p
ShowWindow(SW_SHOWNORMAL); gV-x1s+
bTray=FALSE; h8me.=S&
} Yl!~w:O!o
6I`Lszs
void CCaptureDlg::OnChange() Gcz@z1a=n
{ rfVHPMD0
RegisterHotkey(); ="*:H)
} r p^Gk
[TFd|ywn
BOOL CCaptureDlg::RegisterHotkey() X[{tD#
{ Ug1n4X3FKn
UpdateData(); ?6=u[))M&
UCHAR mask=0; #ovmX
UCHAR key=0; i^zncDMA
if(m_bControl) G$)f5_]7{
mask|=4; 9X- w5$<
if(m_bAlt) ,m)k;co^
mask|=2; D#I^;Xg0h
if(m_bShift) 1!4-M$-
mask|=1; Xi~%,~
key=Key_Table[m_Key.GetCurSel()]; fi.[a8w:W
if(bRegistered){ Xbp~cn
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;I^+u0ga
bRegistered=FALSE; SL O~
} ~dFdO7
cMask=mask; CC<(V{Png
cKey=key; L~u@n24
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); " A}S92
return bRegistered; X?8 EPCk
} O^+H:Y|
` ,O#r0m
四、小结 sD!)= t_
sOY+X
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。