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:
-r~9'aEs
_)YB*z5 一、实现方法
U 17=/E Dk2Zl 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:
$
)2zz>4 L`9.Gf #pragma data_seg("shareddata")
E7w^A HHOOK hHook =NULL; //钩子句柄
. _Jypk8 UINT nHookCount =0; //挂接的程序数目
F8/n; static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Qs8yJH`v static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@$%.iQ7A; static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
yOP$~L#TWs static int KeyCount =0;
0&\71txrzg static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
a^[s[j#^, #pragma data_seg()
h\~!!F ^4Se=Hr
z2 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。
}6{00er fgF@ x 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:
/V]i3ac p=i6~ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Xw|-v$'y cKey,UCHAR cMask)
vv5rA 6+ {
Z}SqiT BOOL bAdded=FALSE;
o,0
Z^"| for(int index=0;index<MAX_KEY;index++){
_oefp*iWS if(hCallWnd[index]==0){
7 ,uD7R_ hCallWnd[index]=hWnd;
*UG?I|l|I HotKey[index]=cKey;
$kkL)O*"] HotKeyMask[index]=cMask;
NH=@[t)P, bAdded=TRUE;
x[+bLlb KeyCount++;
]xJ.OUJy break;
Of9 gS-m }
4((p?jbC }
\SYeDy return bAdded;
;Cty"H, }
Z\n^m^Z
= //删除热键
>-w#&T &K BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)?LZg<< {
qc3,/JO1 BOOL bRemoved=FALSE;
?Ho> for(int index=0;index<MAX_KEY;index++){
IfI:|w}:"r if(hCallWnd[index]==hWnd){
[?$tu%Q(Z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
x7jFYC hCallWnd[index]=NULL;
CqU ^bVs HotKey[index]=0;
T+%P+ HotKeyMask[index]=0;
~9;udBfwF bRemoved=TRUE;
aQ&K a KeyCount--;
qamq9F$V break;
P9q=tC3^ }
}
KhL%ov }
}"kF<gG1 return bRemoved;
D& &71X ' }
Wk!<P"
nHd ?@6Zv$vZ 'coY`B; 8 DLL中的钩子函数如下:
2nL*^hhh lJx5scN[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
WWOjck# {
:j/sTO= BOOL bProcessed=FALSE;
(>lH=&%zj if(HC_ACTION==nCode)
^B7Ls{ {
,*m|Lt%;R if((lParam&0xc0000000)==0xc0000000){// 有键松开
'S&Zq: switch(wParam)
G6JP3dOT {
~HKzqGQy> case VK_MENU:
:wUi&xw MaskBits&=~ALTBIT;
8 ~Pdr]5 break;
2{oQ case VK_CONTROL:
oMoco tQ;$ MaskBits&=~CTRLBIT;
l2Rnyb<;; break;
it-2]Nw case VK_SHIFT:
j|XL$Q MaskBits&=~SHIFTBIT;
-q?, break;
]4K4Nh~ default: //judge the key and send message
VAqZ`y break;
1vJj?Uqc }
|PGTP#O< for(int index=0;index<MAX_KEY;index++){
BV}sN{ if(hCallWnd[index]==NULL)
EDF0q i continue;
WfTl\Dxw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
dqFp"Xe"% {
Z4gn7
'V SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*|;`Gp bProcessed=TRUE;
&!wtH }
K\mFb }
KUHkjA_ }
Gj[5ew?@ else if((lParam&0xc000ffff)==1){ //有键按下
|nqN95'u+] switch(wParam)
79h'sp6; {
[N"=rY4G case VK_MENU:
la^K|!| MaskBits|=ALTBIT;
mDuS-2G=D break;
# 00?]6`z case VK_CONTROL:
{V8uk$ MaskBits|=CTRLBIT;
i#*lK7 break;
7[0CVWs, case VK_SHIFT:
nXjSf MaskBits|=SHIFTBIT;
}n"gX>e~ break;
-uhVw_qq# default: //judge the key and send message
^7=h%{>= break;
>Dz8+y }
,V zbKx, for(int index=0;index<MAX_KEY;index++){
gebL6oc% if(hCallWnd[index]==NULL)
?H_>?,^ continue;
\pP1k.~UnC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4Bt)t#0 {
T!^v^m@>y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
E#!.;AQ bProcessed=TRUE;
&(|Ot`el]v }
(io[O?te }
3[ xHY@c }
k(@W
z>aCv if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
[Ov/&jD" for(int index=0;index<MAX_KEY;index++){
P=s3&NDD if(hCallWnd[index]==NULL)
4`Jf_C continue;
J]Rh+@r. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ZQ-6n1O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mSO7 r F //lParam的意义可看MSDN中WM_KEYDOWN部分
^}J,;Zhu5 }
.;(a;f+{; }
#6pJw?[ }
,)VAKrSg return CallNextHookEx( hHook, nCode, wParam, lParam );
h*3{IHAQ }
G+I->n-s4 Il#ST 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:
_c(h{dn iI &z5Q2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
XdnpL$0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3/]~#y%2 _p^Wc.[~M 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
f6PYB&<1 J.O{+{&cd LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
KJs`[,;< {
j*d+WZm8-g if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
LX =cx$K {
!HeQMz //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
2~vvE SaveBmp();
+&E\w,Vq^ return FALSE;
QC6QqcOX }
]!s@FKC{; …… //其它处理及默认处理
u('`.dwkc }
{z9z#8`C; o'Y/0hkh EZT 8^m 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。
$
% B C]h_co2eI 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。
b~<:k\EE f>&*%[fw 二、编程步骤
6^2='y~e %:sP #BQM 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";
X0]$Ovq( l ]K%d 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,?+uQXfXR #5iwDAw:|r 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;
$Yw~v36`t/ !Fs<r)j 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
(CAkzgTfc &[N_{O| 5、 添加代码,编译运行程序。
`B$Pk0>5r NSq29# 三、程序代码
'a:';hU3f O[p c$Pi ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
P:5vS:s? #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
'QTa<Z)E #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Tr;&bX5]H #if _MSC_VER > 1000
7g%\+%F
I #pragma once
'?LqVzZI #endif // _MSC_VER > 1000
-<e_^ #ifndef __AFXWIN_H__
/"^XrVi- #error include 'stdafx.h' before including this file for PCH
=?N$0F! #endif
6}Rb-\N #include "resource.h" // main symbols
}%^ 3 class CHookApp : public CWinApp
c6iFha;db {
^g.HJQ'vF public:
P0k.\ 8qz CHookApp();
Os!x<r|r // Overrides
#F6M<V' // ClassWizard generated virtual function overrides
[jGE{<Je //{{AFX_VIRTUAL(CHookApp)
@4Q/J$ public:
8N3rYx;d~ virtual BOOL InitInstance();
!P":z0K4 virtual int ExitInstance();
Vl'rO_?t //}}AFX_VIRTUAL
/J(~NGT //{{AFX_MSG(CHookApp)
:?>yi7w // NOTE - the ClassWizard will add and remove member functions here.
ZmJ<FF4 // DO NOT EDIT what you see in these blocks of generated code !
OM`Ws5W}f //}}AFX_MSG
i@ 86Ez DECLARE_MESSAGE_MAP()
Dr"PS
>. };
H29vuGQjq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k7(lwEgNG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
k ,ezB+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
iRM ?_| BOOL InitHotkey();
&vfeBth BOOL UnInit();
?=HoU3 #endif
v+( P 4fS 8v=t-GJW //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+WguWLO" #include "stdafx.h"
QT|\TplJt #include "hook.h"
Z!4B=?( #include <windowsx.h>
*Xn6yL9 #ifdef _DEBUG
H|'n|\{lt #define new DEBUG_NEW
l7Wdbx5x0 #undef THIS_FILE
M<SV H_ static char THIS_FILE[] = __FILE__;
J<&?Hb*| #endif
@ 0/EKWF #define MAX_KEY 100
GC(QV}9z" #define CTRLBIT 0x04
sHOBT,B #define ALTBIT 0x02
X +/^s) #define SHIFTBIT 0x01
\KKE&3= #pragma data_seg("shareddata")
{s=c!08= HHOOK hHook =NULL;
^S(QvoaQ UINT nHookCount =0;
DU-dIqi static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
o@L
'|#e static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
(?i4P5s[! static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
e488}h6#m static int KeyCount =0;
K
28s<i` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
(-@I'CFd #pragma data_seg()
&y-z[GR[{ HINSTANCE hins;
D}N4*L1 void VerifyWindow();
*q@3yB} BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
db>"2EE //{{AFX_MSG_MAP(CHookApp)
S7@/dHN // NOTE - the ClassWizard will add and remove mapping macros here.
R_vK^Da // DO NOT EDIT what you see in these blocks of generated code!
Sae*VvT6 //}}AFX_MSG_MAP
N,*'")k9 END_MESSAGE_MAP()
<y#@v G N37CAbw0 CHookApp::CHookApp()
U?
;Q\=> {
rmdg~ // TODO: add construction code here,
fVi[mH0=+ // Place all significant initialization in InitInstance
48{B} j%oU }
X9C:AGbp n'1LNi CHookApp theApp;
c2]h.G83 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
l-SVI9|<0 {
4y$okn\}i BOOL bProcessed=FALSE;
=6=l.qyYK if(HC_ACTION==nCode)
hW\'EJ {
iEbW[sX[4 if((lParam&0xc0000000)==0xc0000000){// Key up
/2 qxJvZ switch(wParam)
pi/&WMZ< {
vorb? iVf> case VK_MENU:
bzZ7L-yD MaskBits&=~ALTBIT;
DW)X3A(^ break;
VmZDU(M case VK_CONTROL:
OD?y MaskBits&=~CTRLBIT;
mt[ #=Yba break;
gOp81) case VK_SHIFT:
![eipOX MaskBits&=~SHIFTBIT;
HaR x(p0 break;
5JG`FRW! default: //judge the key and send message
om6`>I* break;
3w/z$bj }
b$tf9$f for(int index=0;index<MAX_KEY;index++){
GKG:iR) if(hCallWnd[index]==NULL)
zXxA" continue;
Ym$`EN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"S>VqvH3 {
;R3o$ZlY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
j_b/66JyN bProcessed=TRUE;
Zj0h0Vt }
Z5`V\$ }
PH?<)Wj9i }
('.I)n else if((lParam&0xc000ffff)==1){ //Key down
]
^J switch(wParam)
~h%H;wC& {
q35=_'\W case VK_MENU:
g<:TsP'| MaskBits|=ALTBIT;
N1U.1~U break;
v7@*dg case VK_CONTROL:
ciW;sK8 MaskBits|=CTRLBIT;
r>rL[`p(2 break;
<t"fL
RX case VK_SHIFT:
^GiWU +` MaskBits|=SHIFTBIT;
'G`xD3 E3, break;
V h5\'Sn default: //judge the key and send message
gA 19f break;
CM t$) }
z*o2jz?t4 for(int index=0;index<MAX_KEY;index++)
]puDqu5! {
LwH+X:?i if(hCallWnd[index]==NULL)
t{Ks}9B continue;
\#gguq?[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
msOE#QL6a {
!HXyvyDN SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-1ci.4F& bProcessed=TRUE;
v(,YqT>q@U }
{RD9j1 }
"J`# }
BiZYGq if(!bProcessed){
gmOP8.g for(int index=0;index<MAX_KEY;index++){
Ia:M+20n if(hCallWnd[index]==NULL)
<W*6=HZ' continue;
1`Uu;mz if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
WISK-z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ol;"}3*Z* }
X& XD2o"rt }
P|a|4Bb+fW }
d-I=xpB return CallNextHookEx( hHook, nCode, wParam, lParam );
D8b9T.[( }
*#GX~3A H8E#r*"-m BOOL InitHotkey()
q{!ft9|K\d {
?` 2z8uD/ if(hHook!=NULL){
!)`m mr nHookCount++;
hl,x|.f}4Y return TRUE;
HLqDI lL }
lEw!H^O4 else
SN$3cg]z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,5x9o"N! if(hHook!=NULL)
R,-DP/ (im nHookCount++;
<4I`|D3@ return (hHook!=NULL);
raM{!T: }
UUvR>5@n BOOL UnInit()
oF s)UR {
xzf/W+.>. if(nHookCount>1){
~e5E%bXxC nHookCount--;
e_FoNT return TRUE;
41+@!`z7 }
2l~qzT- BOOL unhooked = UnhookWindowsHookEx(hHook);
pQ8f$I#v if(unhooked==TRUE){
31p7oRzr nHookCount=0;
g c<Y?a- hHook=NULL;
| }d+BD }
MQX9BJ% return unhooked;
|"}rC >+ }
r6nWrO>y }'uV{$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
];u nR<H {
m-Se-aF BOOL bAdded=FALSE;
6-\M }xq? for(int index=0;index<MAX_KEY;index++){
6dRvx;d if(hCallWnd[index]==0){
j<h0`v hCallWnd[index]=hWnd;
1.nYT* HotKey[index]=cKey;
+t(Gt0+ HotKeyMask[index]=cMask;
!{A#\~, bAdded=TRUE;
l4^MYwFR{O KeyCount++;
:6Gf@Z&+ break;
GvL\%0Ibx }
p)~EG=p }
~hT(uxU/ return bAdded;
4v`;D,dIu }
6L-3cxqf\ U \F ?{/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-I~\ {
`L3{y/U' BOOL bRemoved=FALSE;
:T#f&|Gg; for(int index=0;index<MAX_KEY;index++){
mqiCn]8G if(hCallWnd[index]==hWnd){
=ibKdPtTh^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O#)YbaE hCallWnd[index]=NULL;
.gCun_td# HotKey[index]=0;
qh6Q#s>tH HotKeyMask[index]=0;
|gfG\fL3V bRemoved=TRUE;
161IWos KeyCount--;
| break;
[`1@`5SL- }
\CYKj_c }
:7s2M }
U<"k- return bRemoved;
cfHtUv }
D#d/?\2 6<YAoo void VerifyWindow()
t]ID {
mwF{z.t" for(int i=0;i<MAX_KEY;i++){
!"
@<! if(hCallWnd
!=NULL){ =V:Al
if(!IsWindow(hCallWnd)){ <{z-<D;
hCallWnd=NULL; N\fj[?f[
HotKey=0; -e_pw,5c '
HotKeyMask=0; }?9 A:&
KeyCount--; Ag;Ybk[
} >ni0:^vp
} $/Llzpvny
} OK
\9 `
} 0
.ck!"h}
\ns}
M3
BOOL CHookApp::InitInstance() dfXBgsc6i
{ :\%ZTBLL
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (b7',:_U7
hins=AfxGetInstanceHandle(); iz27yXHZ~
InitHotkey(); ziv*4
return CWinApp::InitInstance(); p,3}A(>
} 352RJC
;/!o0:m^I
int CHookApp::ExitInstance() 3E!3kSh|
{ bMqFrG
VerifyWindow(); @/='BVb'T
UnInit(); *d-JAE
return CWinApp::ExitInstance(); 4UMOC_
} K!v\r"N
jN/snU2\0
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jT4
m(j
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e[db?f2!
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JcC2Zn6
#if _MSC_VER > 1000 7MhaLkB_6
#pragma once a._>?rVy
#endif // _MSC_VER > 1000 vJ>o9:(6
((6?b5[
class CCaptureDlg : public CDialog {v2[x W
{ E U'P
U
// Construction `KieN/d%
public: s@*i
BOOL bTray; {O4&HW%
BOOL bRegistered; B_"PFWwg
BOOL RegisterHotkey(); |J~A )Bw?
UCHAR cKey; +)_#j/
UCHAR cMask; jPs{Mr<
void DeleteIcon(); b .cBg.a
void AddIcon(); 5
axt\
UINT nCount; ]<u%jTQREd
void SaveBmp(); x.'Ys1M
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'N\nJz}
// Dialog Data "71Y{WQ
//{{AFX_DATA(CCaptureDlg) EnEaUb?P
enum { IDD = IDD_CAPTURE_DIALOG }; RP9~n)h~b
CComboBox m_Key; LKg9{0Y:
BOOL m_bControl; tYx>?~
BOOL m_bAlt; )Dyyb1\)
BOOL m_bShift; ;b 'L2
CString m_Path; 5YXMnYt9
CString m_Number; ,hCbx#h
//}}AFX_DATA )4n]n:FjN
// ClassWizard generated virtual function overrides {]O.?Yru?
//{{AFX_VIRTUAL(CCaptureDlg) U/-|hfh
public: dlwOmO'Bm)
virtual BOOL PreTranslateMessage(MSG* pMsg); :DFtH13qO
protected: SOluTFxUw
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vtRz;~,Z
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !#S"[q
//}}AFX_VIRTUAL XLlJ|xhY-K
// Implementation P8 R^46
protected: Q$Q:Jm53
HICON m_hIcon; |A2o$H
// Generated message map functions .+~9
vH
//{{AFX_MSG(CCaptureDlg) '^tC |)
virtual BOOL OnInitDialog(); H5be 5
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C-/+n5J
afx_msg void OnPaint(); Sre:l'.
afx_msg HCURSOR OnQueryDragIcon(); )O>M~
virtual void OnCancel(); 1|$J>
afx_msg void OnAbout(); *nwH1FjH
afx_msg void OnBrowse(); b[MKo7
afx_msg void OnChange(); s^/2sjoL
//}}AFX_MSG 5oo6d4[
DECLARE_MESSAGE_MAP() nQG<OVRClS
}; yjM!M|
#endif 8L*#zaSAf
22 `e7
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f+2mX"Z[F
#include "stdafx.h" DK|/|C}6
#include "Capture.h" G#6O'G
N
#include "CaptureDlg.h" :e\M~n+y
#include <windowsx.h> 9!6u Yf+
#pragma comment(lib,"hook.lib") |wuN`;gc"
#ifdef _DEBUG <4N E)!#
#define new DEBUG_NEW Q;kl-upn~8
#undef THIS_FILE v1 f^gde
static char THIS_FILE[] = __FILE__; b2~5 LZ
#endif <@;bxSUx
#define IDM_SHELL WM_USER+1 wYh]3
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o)H|
#9h5
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w}
r mYQ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J,k.*t:
class CAboutDlg : public CDialog #,OiZQJC
{ ;ih;8
public: ~$YasFEz
CAboutDlg(); 5Z13s
// Dialog Data r(g2&}o\
//{{AFX_DATA(CAboutDlg) :d@RN+U
enum { IDD = IDD_ABOUTBOX }; y4Nam87;/?
//}}AFX_DATA VA%4ssy
// ClassWizard generated virtual function overrides |lh&l<=(f
//{{AFX_VIRTUAL(CAboutDlg) UL xgvq
protected: l;h5Y<A%?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *7),v+ET
//}}AFX_VIRTUAL H h%|}*f_,
// Implementation 'i 8`LPQ
protected: pMkM@OH
//{{AFX_MSG(CAboutDlg) +l<;?yk:;
//}}AFX_MSG v5.KCc}"
DECLARE_MESSAGE_MAP() unyU|B
}; ZsGJ[
yg"FF:^T
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +<WNAmh
{ EH]qYF.
//{{AFX_DATA_INIT(CAboutDlg) T!>sL=uf
//}}AFX_DATA_INIT <M\#7.](
} ePTxuCf>
b3q&CJ4|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s2 $w>L
{ ![m6$G{y
CDialog::DoDataExchange(pDX); [\=1|t5n~
//{{AFX_DATA_MAP(CAboutDlg) [2z
>8SL
//}}AFX_DATA_MAP c`7 dNx
} Y7 e1%,$v
#}[NleTVt
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U+VyH4"
//{{AFX_MSG_MAP(CAboutDlg) y.::d9v
// No message handlers `=2p6<#z
//}}AFX_MSG_MAP _:!7M^IU
END_MESSAGE_MAP() D~ 7W
FMC]KXSd
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {G{>Qa|
: CDialog(CCaptureDlg::IDD, pParent) |zOwC9-6
{ v+'*.Iv:
//{{AFX_DATA_INIT(CCaptureDlg) {%6g6?=j
m_bControl = FALSE; ,jeC7-tX
m_bAlt = FALSE; (Z Q?1Qxo
m_bShift = FALSE; RHmT$^=
m_Path = _T("c:\\"); &cy<"y
m_Number = _T("0 picture captured."); Dc0CQGx9b
nCount=0; eU\_m5xl"
bRegistered=FALSE; P3TM5
bTray=FALSE; TmJXkR.5
//}}AFX_DATA_INIT fj[Kbo 7!h
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H_w?+Rig
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ZN!<!"~
} {}BAQ9|q
S4
s#EDs
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) </_.+c [
{ 0Q[;{}W}
CDialog::DoDataExchange(pDX); }`]Et99Q5
//{{AFX_DATA_MAP(CCaptureDlg) lDZ~
DDX_Control(pDX, IDC_KEY, m_Key); [NbW"Y7
DDX_Check(pDX, IDC_CONTROL, m_bControl); BVS
SO's
DDX_Check(pDX, IDC_ALT, m_bAlt); >txeo17Ba\
DDX_Check(pDX, IDC_SHIFT, m_bShift); 5e&;f
DDX_Text(pDX, IDC_PATH, m_Path); cpphnGj5
DDX_Text(pDX, IDC_NUMBER, m_Number); C9eisUM
//}}AFX_DATA_MAP ]aYuBoj
} WpC9(AX5g
q<4{&omUJ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }bnodb^.7
//{{AFX_MSG_MAP(CCaptureDlg) S(_DR8
ON_WM_SYSCOMMAND() EEiWIf&S,
ON_WM_PAINT() DDZnNSo<JQ
ON_WM_QUERYDRAGICON() 1tl qw
ON_BN_CLICKED(ID_ABOUT, OnAbout) kT:?1 w'
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c9+yU~(
ON_BN_CLICKED(ID_CHANGE, OnChange) UtHloq(r
//}}AFX_MSG_MAP @%r"7%tq>
END_MESSAGE_MAP() n_*.i1\'w
~gg&G~ET
BOOL CCaptureDlg::OnInitDialog() gq~"Z[T
{ =0SJf 3
CDialog::OnInitDialog(); 54oJMW9
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \og2\Oh&gH
ASSERT(IDM_ABOUTBOX < 0xF000); TwKi_nh2m
CMenu* pSysMenu = GetSystemMenu(FALSE); L),bPfz
if (pSysMenu != NULL) r"dR}S.Uf
{ *TPWLR ^
CString strAboutMenu; y8dOx=c
strAboutMenu.LoadString(IDS_ABOUTBOX); wqgKs=y
if (!strAboutMenu.IsEmpty()) hbs /S
{ ~iq=J5IN#
pSysMenu->AppendMenu(MF_SEPARATOR); DkW^gt
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \+k~p:d_8
} vILgM\or
} )-25?B
SetIcon(m_hIcon, TRUE); // Set big icon `tl -] ^Y2
SetIcon(m_hIcon, FALSE); // Set small icon fP
llN8n
m_Key.SetCurSel(0); p:3w8#)MZ
RegisterHotkey(); wcGv#J],
CMenu* pMenu=GetSystemMenu(FALSE); w7f)v\p
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7yOBxb
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); sY?sQ'E2]
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ){KrBaGa4
return TRUE; // return TRUE unless you set the focus to a control tMyMA}`
} }$s QmRR
gZ=$bR
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R#s_pW{op
{ G^#?~
if ((nID & 0xFFF0) == IDM_ABOUTBOX) [C@Ro,mI
{ 3V<c4'O\W
CAboutDlg dlgAbout; l|M|;5TW
dlgAbout.DoModal(); }Ggn2 X
} -jVg{f!
else $_gv(&ZT
{ iDYm4sY
CDialog::OnSysCommand(nID, lParam); M%s!qC+
} )/Oldyp
} i*mI-l
Q+Eqaz`
void CCaptureDlg::OnPaint() =nlj|S ~3
{ ,_K:DSiB
if (IsIconic()) Uh'W d_?
{ >2NsBS(
CPaintDC dc(this); // device context for painting Fzz9BEw(i
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); & d* bQv$
// Center icon in client rectangle UU '9
int cxIcon = GetSystemMetrics(SM_CXICON); P1<McQ
int cyIcon = GetSystemMetrics(SM_CYICON); c)c_Qv
CRect rect; z2q!_ ~
GetClientRect(&rect); U@:l~xJ
int x = (rect.Width() - cxIcon + 1) / 2; <"av /`;
int y = (rect.Height() - cyIcon + 1) / 2; @.pr}S/
// Draw the icon 4I2#L+W
dc.DrawIcon(x, y, m_hIcon); {ea*dX872:
} Zt
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else H7f
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{ "@rHGxK
CDialog::OnPaint();
_w
FK+>
} !. :b}t
} v+CW([zAx#
PmT<S,}L
HCURSOR CCaptureDlg::OnQueryDragIcon() o%K1!'
{ 6` 3kNk;
return (HCURSOR) m_hIcon; _:JV-lM
} <80M$a
g
1 K]
void CCaptureDlg::OnCancel() ML%JTx0+Z
{ lo36b zbT
if(bTray) m`jGBSlw_
DeleteIcon(); l>)+HoD
CDialog::OnCancel(); ozA%u,\7k
} &09G9G snQ
FV%|*JW[;N
void CCaptureDlg::OnAbout() <f0yh"?6VH
{ Z 2lX^z
CAboutDlg dlg; Y>K8^GS
dlg.DoModal(); nyOvB#f
} !RN9wXS7
o@YEd d
void CCaptureDlg::OnBrowse() U[:Js@uH_
{ Kc+9n%sp
CString str; 5"D\n B%
BROWSEINFO bi; Ah
zV?6e
char name[MAX_PATH]; {6F]w_\
ZeroMemory(&bi,sizeof(BROWSEINFO)); Dc] J3r
bi.hwndOwner=GetSafeHwnd(); NC|VZwQtm
bi.pszDisplayName=name; y/+y |.Xg
bi.lpszTitle="Select folder"; 51'V[tI;8
bi.ulFlags=BIF_RETURNONLYFSDIRS; LtNspFoLb
LPITEMIDLIST idl=SHBrowseForFolder(&bi); SA
[(1dy;
if(idl==NULL) vb`:
return; /}s#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $[b1_Db
str.ReleaseBuffer(); ryTtGx%a
m_Path=str; l{V(Y$xp3
if(str.GetAt(str.GetLength()-1)!='\\') V_KHVul
m_Path+="\\"; .iST!nh
UpdateData(FALSE); =HMuAUa.
} YW"nPZNPy~
nDNK}O~'
void CCaptureDlg::SaveBmp() *k 0;R[IAV
{ aI\ ]R:f,
CDC dc; bLUyZ3m!
dc.CreateDC("DISPLAY",NULL,NULL,NULL); G ahY+$L,
CBitmap bm; c43&[xPLz
int Width=GetSystemMetrics(SM_CXSCREEN); q4Y'yp`?K;
int Height=GetSystemMetrics(SM_CYSCREEN); UO-,A j*wW
bm.CreateCompatibleBitmap(&dc,Width,Height); %gTY7LIe1z
CDC tdc; I!.-}]k
tdc.CreateCompatibleDC(&dc); 7QaZ|\c
CBitmap*pOld=tdc.SelectObject(&bm); <p[RhP
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :{?Pq8jP
tdc.SelectObject(pOld); N
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BITMAP btm; +sXnC\
bm.GetBitmap(&btm); 07Oagq(
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]jV1/vJ-!
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ) 3I|6iS
BITMAPINFOHEADER bih; YV6w}b:
bih.biBitCount=btm.bmBitsPixel;
kb'l@d#E
bih.biClrImportant=0; D
\boF+^
bih.biClrUsed=0; dkZ[~hEQG-
bih.biCompression=0; UDb
bih.biHeight=btm.bmHeight; V}Pv}j:;
bih.biPlanes=1; Rz33_ qA
bih.biSize=sizeof(BITMAPINFOHEADER); Fh.ZsPn,m
bih.biSizeImage=size; (-{.T
bih.biWidth=btm.bmWidth; :Z]\2(x
bih.biXPelsPerMeter=0; ),0Ea~LB4
bih.biYPelsPerMeter=0; 83Fmu/(
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d^`n/"Ice
static int filecount=0; X&,a=#C^
CString name; 5WI0[7
name.Format("pict%04d.bmp",filecount++); Chtls;Ph[
name=m_Path+name; ET|4a(x
BITMAPFILEHEADER bfh; , D`\
RV
bfh.bfReserved1=bfh.bfReserved2=0; S?Uvt?
bfh.bfType=((WORD)('M'<< 8)|'B'); JwUz4
bfh.bfSize=54+size; #F+b^WTR
bfh.bfOffBits=54; $"Nqto~
CFile bf; fJn4'Q*U
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KPa&P:R3
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9bD ER
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); a6g+"EcH#'
bf.WriteHuge(lpData,size); (M%ZSF V
bf.Close(); AaJz3oncJ
nCount++; OWmI$_L
} $PTl{
GlobalFreePtr(lpData); =`wnng5m
if(nCount==1) <:~'s]`zf
m_Number.Format("%d picture captured.",nCount); d'p@[1/
else *)i+ c{~
m_Number.Format("%d pictures captured.",nCount); \p!mX|
UpdateData(FALSE); BR0P :h
} T2k# "zD
w5mSoKb
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }vQY+O
{ /x&52~X5-
if(pMsg -> message == WM_KEYDOWN) wdEQB-dA
{ /^Zgv-n
if(pMsg -> wParam == VK_ESCAPE) @|9V]bk
return TRUE; 7XiR)jYo*
if(pMsg -> wParam == VK_RETURN) Tc;j)_C)
return TRUE; G88g@Exk
} -}Gk@=$G
return CDialog::PreTranslateMessage(pMsg); ;5=5HYx%
} ~)!vhdBe
[1.>9ngj
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ](^BQc
{ iR4!X()
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FdmoR;
SaveBmp(); )>WSuf
j
return FALSE; %<'PSri
} N x/_+JWje
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]a\HgFp@
CMenu pop; !*=+E%7
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1.q
a//'RW
CMenu*pMenu=pop.GetSubMenu(0); %;YERO!
pMenu->SetDefaultItem(ID_EXITICON); fvw&y+|y!
CPoint pt; :JG2xtn
GetCursorPos(&pt); YDiru
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'M3V#5l)@|
if(id==ID_EXITICON) SWMi+)
DeleteIcon(); o%?~9rf]]
else if(id==ID_EXIT) M\be a
OnCancel();
c|~f[
return FALSE; YN5p@b=FX
} __,}/|K2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *Duxabo?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -wn(J5NnR
AddIcon(); Xq.GvZS`
return res; !8OUH6{2
} GZNfx8zsY+
+L<x0-&
void CCaptureDlg::AddIcon() u[1'Ap
{ iC Z1ARi
NOTIFYICONDATA data; W8s/"
data.cbSize=sizeof(NOTIFYICONDATA); h%(0|
CString tip; ~bSjZ1`
tip.LoadString(IDS_ICONTIP); <}^l MBa
data.hIcon=GetIcon(0); G:?l;+P1
data.hWnd=GetSafeHwnd(); V?+Y[Q
strcpy(data.szTip,tip); Z)H9D(Za
data.uCallbackMessage=IDM_SHELL; Mj- B;r
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tvvRHvL
data.uID=98; t[?O*>
Shell_NotifyIcon(NIM_ADD,&data); u7ER
ShowWindow(SW_HIDE); *61G<I
bTray=TRUE; a gxR
V
} )l*6zn`z
YNWAef4
void CCaptureDlg::DeleteIcon() 73'.TReK
{ 99..]
NOTIFYICONDATA data; FQ6{NMz,h
data.cbSize=sizeof(NOTIFYICONDATA); gjhWoZV
data.hWnd=GetSafeHwnd(); dFVm18
data.uID=98; ,[0rh%%j
Shell_NotifyIcon(NIM_DELETE,&data); <{b#nPc!,#
ShowWindow(SW_SHOW); IBe0?F #
SetForegroundWindow(); 334tg'2]
ShowWindow(SW_SHOWNORMAL); 00(#_($
bTray=FALSE; 5_ioJ
} #u6ZCv7u
+b6kU{
void CCaptureDlg::OnChange() '9#h^.
{ 5$p7y:
RegisterHotkey(); ]NgEN
} Hze~oAP+
]R s
BOOL CCaptureDlg::RegisterHotkey() Ww $?X LF
{ f8?c[%br
UpdateData(); \3v}:E+3
UCHAR mask=0; 2zN%Z!a#J
UCHAR key=0; ?.b.mkJ
if(m_bControl) l:rT{l=8*
mask|=4; a#:K"Mf.
if(m_bAlt) ^zVBS7`J
mask|=2; .|9o`mF7
if(m_bShift) !]z6?kUK
mask|=1; S`?cs^?
key=Key_Table[m_Key.GetCurSel()]; gw);b)&mx
if(bRegistered){ _f5n
t:-
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8]-c4zK
bRegistered=FALSE; -?&s6XA%#
} v22ZwP
cMask=mask; p[lciWEW
cKey=key; V57tn6>b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); QUU'/e2^c
return bRegistered; &lYe
} *wetPt)~v_
xnm!$ $W
四、小结 G.#sX
qCaM]Y
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。