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:
1Q"w)Ta
DjY&)oce( 一、实现方法
/.B7y( 12qX[39/ 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:
kDI(Y=Fg VM=A#} #pragma data_seg("shareddata")
PDQC^2Z HHOOK hHook =NULL; //钩子句柄
TbX#K:l UINT nHookCount =0; //挂接的程序数目
c-3-,pyM_T static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Br^4N9 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
OXcQMVa
6 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
HwfBbWHr' static int KeyCount =0;
le60b@2G0 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
VqGmZ|+8 #pragma data_seg()
tQ0iie1Ys ]."~) 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。
KG9h
rT 0'8_:|5 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:
|R[@u=7s sjl( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
c1 aCN cKey,UCHAR cMask)
"Kky|(EQ$$ {
wJ#fmQXKJ5 BOOL bAdded=FALSE;
Mh
[TZfV for(int index=0;index<MAX_KEY;index++){
IIrh|>d_7 if(hCallWnd[index]==0){
?pSb,kN}' hCallWnd[index]=hWnd;
1./uJB/ HotKey[index]=cKey;
(ndXz HotKeyMask[index]=cMask;
u'Ja9m1 bAdded=TRUE;
2kMBe% KeyCount++;
`w/:o$& break;
fLkZ'~e! }
N
zrHWVD }
LpRl!\FY$ return bAdded;
#9{N[t }
NqyKR&; //删除热键
[R
V_{F:' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$Ro]]NUz| {
Mn$w_Z? BOOL bRemoved=FALSE;
K+2k}Hx6J for(int index=0;index<MAX_KEY;index++){
o[Ojl.r< if(hCallWnd[index]==hWnd){
I
ACpUB if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
V9aGo# hCallWnd[index]=NULL;
iA*^`NMaT HotKey[index]=0;
^na8d's: HotKeyMask[index]=0;
]?KTw8j} bRemoved=TRUE;
MR4e.+#E KeyCount--;
}/)vOUcEd break;
^3~+| A98M }
2J7=
O^$? }
bm/pLC6%. }
cyYsz'i m return bRemoved;
X S:W{tL! }
X}"Ic@8 "rxhS;
R1> /mS|Byx DLL中的钩子函数如下:
tYb8a >4I,9TO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
z}Y23W&sX {
3B *b d BOOL bProcessed=FALSE;
4)- ?1?) if(HC_ACTION==nCode)
Vyy;mEBg {
KmF"Ccc if((lParam&0xc0000000)==0xc0000000){// 有键松开
k55s-%Ayr switch(wParam)
BY*{j&^ {
FXLY*eRk case VK_MENU:
TpnJm%9`)t MaskBits&=~ALTBIT;
</xz
V<Pi break;
K|n%8hRy case VK_CONTROL:
jhRg47A MaskBits&=~CTRLBIT;
R#"LP7\ break;
<4lR case VK_SHIFT:
B=<>OYH MaskBits&=~SHIFTBIT;
9, A(|g break;
=*paa default: //judge the key and send message
WY>r9+A?W break;
(L`7-6e(Ab }
18`YY\u( for(int index=0;index<MAX_KEY;index++){
?E>(zV1D/ if(hCallWnd[index]==NULL)
VkFvV><" continue;
MTnW5W-r9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#6g9@tE {
>z{*>i,m1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
oe (})M bProcessed=TRUE;
4KbOyTQ }
6_UCRo5h% }
@*Y"[\ "$ }
-4 *94< else if((lParam&0xc000ffff)==1){ //有键按下
fEv`iXZG switch(wParam)
31VDlcnE {
tW^oa case VK_MENU:
gu1:%raXd MaskBits|=ALTBIT;
gKPqWh break;
uUhqj.::<Y case VK_CONTROL:
6[.#B!;9 MaskBits|=CTRLBIT;
U-~6<\Mf break;
$ ,:3I*}be case VK_SHIFT:
cd&^ vQL8 MaskBits|=SHIFTBIT;
ON,sN break;
z (1zth default: //judge the key and send message
#'5C*RO break;
9+i rf^D`O }
EO.Se9ux for(int index=0;index<MAX_KEY;index++){
f`;y
"ba if(hCallWnd[index]==NULL)
i}tBB~] continue;
]VKM3[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tfKf*Um {
LqYP0%7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
yr;~M{{4 bProcessed=TRUE;
Q>ZxJ!B<k }
VtTTvP3 }
|2Krxi3* }
%>];F~z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
0 _n
Pq for(int index=0;index<MAX_KEY;index++){
(7X|W<xT if(hCallWnd[index]==NULL)
+6zW(Ql/
continue;
k?bIu if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
y
4
wV]1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
L'Yg$9 Vz //lParam的意义可看MSDN中WM_KEYDOWN部分
|]M|IX8
o }
kVmRv.zZ }
Yg<L pjq5X }
Ri return CallNextHookEx( hHook, nCode, wParam, lParam );
#oYPe:8|m }
Hto RN^9 bHKTCPf 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
~M c'~:{O ]NEr]sc-"F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
=8o$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]\JLlQ}#H hR4\:s+[ 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:
gR\z#Sg aAbK{=/y_! LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
&g.do? {
}OsAO if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
O|} p=ny {
IgmCZ?l&0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?5IF;vk SaveBmp();
!=3Ce3- return FALSE;
w *pTK + }
_Xqa_6+/ …… //其它处理及默认处理
'5)PYjMnH }
1u~CNHm sk%Xf, 69"4/n7B? 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。
XsEotW 3LkcK1x. 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。
De-hHY{> o*t4zF&n 二、编程步骤
V+$^4Ht im&Nkk4n@ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
)ep1`n- Q M) ob 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
mx!EuF$I /prR;'ks 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;
w7%.EA{N 1RgERj 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;
jhJ'fI '>^!a!<G 5、 添加代码,编译运行程序。
!jTxMf
h}U>K4BJ 三、程序代码
?8/T#ox hh[@q*C ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
!{+a2wi #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
1\X_B`xwD #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
dJ9v/k_ #if _MSC_VER > 1000
Y6[O
s1 #pragma once
m S4N%Q #endif // _MSC_VER > 1000
'Ul^V #ifndef __AFXWIN_H__
lD#S:HX #error include 'stdafx.h' before including this file for PCH
xE5VXYU #endif
b{Bef*`/ #include "resource.h" // main symbols
edL sn>\*# class CHookApp : public CWinApp
Vo;0i$ {
tuslkOE# public:
20
Z/Y\ CHookApp();
KIGMWS^^ // Overrides
0F%/R^mw // ClassWizard generated virtual function overrides
N[zR%(YS //{{AFX_VIRTUAL(CHookApp)
o}=c(u public:
D=jtXQF virtual BOOL InitInstance();
0B]c`$"aD virtual int ExitInstance();
rNoCmNm //}}AFX_VIRTUAL
?dyt!>C //{{AFX_MSG(CHookApp)
)B9 /P>c // NOTE - the ClassWizard will add and remove member functions here.
5D < // DO NOT EDIT what you see in these blocks of generated code !
MAcjWb~f //}}AFX_MSG
~='}(Fg: DECLARE_MESSAGE_MAP()
@x@wo9<Fc };
YM,UM> LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=lmelo#m& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
GD1L6kVd1 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2[CHiB*>
BOOL InitHotkey();
j%)@f0Ng BOOL UnInit();
yTR5*{?j #endif
jfU$qo!gi '[vCC' //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
~[Z(6yX #include "stdafx.h"
jSQM3+`b #include "hook.h"
GQ 0(lS #include <windowsx.h>
T`2a) #ifdef _DEBUG
v@,`(\Ca' #define new DEBUG_NEW
cz1 m05E #undef THIS_FILE
qV)hCc/ ~ static char THIS_FILE[] = __FILE__;
i.0d>G><@ #endif
`Ip``I#A #define MAX_KEY 100
+O4//FC-" #define CTRLBIT 0x04
zmhAeblA #define ALTBIT 0x02
tkP& =$ #define SHIFTBIT 0x01
[
e#[j{ #pragma data_seg("shareddata")
)S9}uOG# HHOOK hHook =NULL;
`4,]Mr1b UINT nHookCount =0;
zgl$ n static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ge ]Z5E(1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
tP89gN^PA| static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
KP_7h/e static int KeyCount =0;
zHD8\* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
u`"Y!*[ - #pragma data_seg()
qGi\*sc>x HINSTANCE hins;
d~KTUgH'< void VerifyWindow();
e8&7W3 m BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
bQ-n<Lx //{{AFX_MSG_MAP(CHookApp)
`-g$
0lm7 // NOTE - the ClassWizard will add and remove mapping macros here.
w19OOD // DO NOT EDIT what you see in these blocks of generated code!
w>4( hGO //}}AFX_MSG_MAP
^ f[^.k$3d END_MESSAGE_MAP()
/jSb^1\ ~m4LL[ CHookApp::CHookApp()
*rVI[kL {
{S`Rr/E|% // TODO: add construction code here,
N}Or+:"O:q // Place all significant initialization in InitInstance
NNBT.k3) }
x@*?~1ai zp\_5[qJ; CHookApp theApp;
G_}oI|B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
44pVZ5c {
`_x#`%!#2 BOOL bProcessed=FALSE;
,xutI if(HC_ACTION==nCode)
M hjIE<OI= {
X([@}ren if((lParam&0xc0000000)==0xc0000000){// Key up
lNMJcl3 switch(wParam)
2RdpVNx\y {
tILnD1q case VK_MENU:
CdKs+x&tZ MaskBits&=~ALTBIT;
_ucixM# break;
I7C+XUQkQ case VK_CONTROL:
,=2)1I] MaskBits&=~CTRLBIT;
1[-RIN;U8 break;
rIX 40,` case VK_SHIFT:
!Pu7%nV. MaskBits&=~SHIFTBIT;
x[R?hS,0t break;
X;v{,P=J default: //judge the key and send message
4M;S&LA break;
212 =+k }
X7SSTcA for(int index=0;index<MAX_KEY;index++){
88}0 4 if(hCallWnd[index]==NULL)
b/4gs62{k continue;
N6v*X+4JH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ls*Vz,3!5 {
m/WDJ$d SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!lKDNQ8>[" bProcessed=TRUE;
\}Kad\) }
W$`
WkR }
+!t *LSF }
F#o{/u?T else if((lParam&0xc000ffff)==1){ //Key down
5a/3nsup5 switch(wParam)
(kx>\FIK* {
f5R%F~ case VK_MENU:
&<) _7? MaskBits|=ALTBIT;
2|`~3B)# break;
KF7d`bRe case VK_CONTROL:
PAiVUGp5[ MaskBits|=CTRLBIT;
NJKk\RM@7 break;
akQb%Wq case VK_SHIFT:
V3_qqz}`r MaskBits|=SHIFTBIT;
5;[0Q break;
Xm6M s<z6 default: //judge the key and send message
c70B break;
w$749jGx }
_X)]/A%@ for(int index=0;index<MAX_KEY;index++)
vIFx'S~D {
3ep
L'My$ if(hCallWnd[index]==NULL)
z]sQ3"cmX continue;
ktv{-WG2_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fVZ_*'v {
>Lz2zlZI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
pe+m%;nzR bProcessed=TRUE;
Ds\f?\Em }
aX~'
gq> }
xH-} <7 }
5;9.&f if(!bProcessed){
)' 2vUt`_7 for(int index=0;index<MAX_KEY;index++){
)Y?E$=M+B if(hCallWnd[index]==NULL)
;8gODj:dO continue;
b{W ,wn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+@PZ3
[s SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
K=2j}IPe }
%;` 3I$ }
V{0 V/Nv }
7wqD_Xr return CallNextHookEx( hHook, nCode, wParam, lParam );
ezd@>(hJ }
Kw>gg E}]SGU" BOOL InitHotkey()
_xdttO^N {
;~s@_}& if(hHook!=NULL){
73M;-qnU nHookCount++;
<pUc(
tPoz return TRUE;
j MA%`*r }
_[
`"E' else
98WJ"f_ # hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!v 3wl0 if(hHook!=NULL)
,-BZsZ0~ nHookCount++;
yAc}4*;T/ return (hHook!=NULL);
A3 zNUad; }
/zV0kW>N BOOL UnInit()
*tT5Zt/&Sr {
St1>J.k_ if(nHookCount>1){
c{f1_qXN nHookCount--;
& l~=c2 return TRUE;
;}k_2mr~ }
{XYf"ONi BOOL unhooked = UnhookWindowsHookEx(hHook);
$Vm J[EF1 if(unhooked==TRUE){
3K_!:[ nHookCount=0;
J~G"D-l<9/ hHook=NULL;
+z\O"zlj }
.]Z,O>N return unhooked;
$E@ke: }
o6
[i0S #/pZ#ny BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
II_MY#0X {
Ia)^ BOOL bAdded=FALSE;
*$>$O% for(int index=0;index<MAX_KEY;index++){
s[@@INU if(hCallWnd[index]==0){
JGk,u6K7 hCallWnd[index]=hWnd;
U0S}O(Ptr HotKey[index]=cKey;
[ \Aor[( HotKeyMask[index]=cMask;
Z8Clm:S bAdded=TRUE;
; d
> KeyCount++;
kC[nY break;
|zL .PS }
Xq%!(YD| }
KBGJB`D* return bAdded;
uO-R:MC }
k)USLA r,dxW5v. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
^A$~8?f {
^SRa!8z$W BOOL bRemoved=FALSE;
DSHpM/7 for(int index=0;index<MAX_KEY;index++){
5*>3(U if(hCallWnd[index]==hWnd){
L9U<E $%# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
WJL,L[XC hCallWnd[index]=NULL;
r^6vo6^ HotKey[index]=0;
+NEP*mk HotKeyMask[index]=0;
&On0)G3Rc bRemoved=TRUE;
IN]bAd8" KeyCount--;
4B}w;d@R break;
,@ Cru= }
$RSVN? }
z*>CP }
cWM|COXL+ return bRemoved;
I@q>ES!1H }
g^En6n) aa1XY&G"! void VerifyWindow()
;7<a0HZ5! {
i]LK,' for(int i=0;i<MAX_KEY;i++){
Xl*-A|:j if(hCallWnd
!=NULL){ ;3sT>UB
if(!IsWindow(hCallWnd)){ U^0vLyqW^5
hCallWnd=NULL; .< vg[
HotKey=0; #(*WxVE
HotKeyMask=0; 6YU2
!x
KeyCount--; C5RDP~au
} uf)W?`e~
} L ou4M
} .^.UJo;4G
} 90aPIs-
J0p,P.G
BOOL CHookApp::InitInstance() +;[`fSi
{ j)IK
AFX_MANAGE_STATE(AfxGetStaticModuleState()); n7q-)Dv_U
hins=AfxGetInstanceHandle(); ?3z+|;t6C
InitHotkey(); 3]Lk}0atpL
return CWinApp::InitInstance(); .Um%6a-
} 1I^Sv
;+b}@e
int CHookApp::ExitInstance() ]:E]5&VwV}
{ FvI`S>
VerifyWindow(); L
kq>>?T=
UnInit(); (Fgt #H(B
return CWinApp::ExitInstance(); Nyqm0C6m^
} Dfhs@ z
fZ g*@RR
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $=m17GD
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RLHe;-*b]I
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ IfXLnD^||
#if _MSC_VER > 1000 -6tF
#pragma once x(7K3(#|
#endif // _MSC_VER > 1000 C aJD*
)#ujF~w>
class CCaptureDlg : public CDialog Gj_b GqF8}
{ D[#\Y+N
// Construction V!<#E)-?<
public: l*:p==
BOOL bTray; -% fDfjP
BOOL bRegistered; cT0g, ^&
BOOL RegisterHotkey(); }t-r:R$,
UCHAR cKey; N~ozyIP,
UCHAR cMask; -5ec8m8
void DeleteIcon(); Y)
t}%62
void AddIcon(); sTqB%$K}
UINT nCount; "DN `@
void SaveBmp(); 3CHte*NL=
CCaptureDlg(CWnd* pParent = NULL); // standard constructor QF>[cdl?8
// Dialog Data BVNh>^W5B
//{{AFX_DATA(CCaptureDlg) Nb9pdkf0
enum { IDD = IDD_CAPTURE_DIALOG }; $WPN.,7
CComboBox m_Key; YWZF*,4
BOOL m_bControl; h B+ t
pa
BOOL m_bAlt; |}|;OG
BOOL m_bShift; 9,c>H6R7
CString m_Path; HYH!;
CString m_Number; q%vUEQLBp
//}}AFX_DATA K/,lw~>
// ClassWizard generated virtual function overrides &L?Dogo
//{{AFX_VIRTUAL(CCaptureDlg) ;hZ@C!S:
public: 5nn*)vK {
virtual BOOL PreTranslateMessage(MSG* pMsg); Bm7GU`j"
protected: UK<"|2^sT
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
]\e zES
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3U`.:w`
//}}AFX_VIRTUAL `3:%F>
// Implementation >lW*%{|b$^
protected: J@TM>R
HICON m_hIcon; 3*TS
4xX
// Generated message map functions (~GFd7
//{{AFX_MSG(CCaptureDlg) -ur]k]R
virtual BOOL OnInitDialog(); e](=)h|
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,{50zx2
afx_msg void OnPaint(); <XagkD
afx_msg HCURSOR OnQueryDragIcon(); m&%b;%,J
virtual void OnCancel(); \nyFN
afx_msg void OnAbout(); N9ufTlq
s
afx_msg void OnBrowse(); ybG)=0
afx_msg void OnChange(); i=a LC*@
//}}AFX_MSG @6!JW(,]\
DECLARE_MESSAGE_MAP() `+o.w#cl
}; YC_^jRB8n
#endif FTfA\/tl(;
/fq6-;co+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PS22$_}
#include "stdafx.h" ("oA{:@d
#include "Capture.h" Uk2q,2
#include "CaptureDlg.h" %E\%nTV
#include <windowsx.h> kt#W~n
#pragma comment(lib,"hook.lib") h,+=h;!
#ifdef _DEBUG z>:7}=H0
#define new DEBUG_NEW <X |h*
#undef THIS_FILE t_rDXhM
static char THIS_FILE[] = __FILE__; [s2V-'2
#endif
c$|dK
#define IDM_SHELL WM_USER+1 OQQ9R?Ll{
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k#(cZ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dL`
+^E>
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,f+5x]F?m
class CAboutDlg : public CDialog 9gg,Dy
{ PpRO7(<cD
public: o4;Nb|kk9+
CAboutDlg(); dE]"^O#Mc
// Dialog Data >nDnb4 'C
//{{AFX_DATA(CAboutDlg) ,]mwk~HeF
enum { IDD = IDD_ABOUTBOX }; =R.9"7~2x
//}}AFX_DATA ks;w c"k"
// ClassWizard generated virtual function overrides H=#Jg;_w
//{{AFX_VIRTUAL(CAboutDlg) 1znV>PO!
protected: 2>k)=hl:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R6XMBYK^
//}}AFX_VIRTUAL m4wTg
8LJ
// Implementation C#&6p0U
protected: u&x K>7
//{{AFX_MSG(CAboutDlg) ([-=NT}Aq
//}}AFX_MSG o
z{j2%
DECLARE_MESSAGE_MAP() syf"{bBe
}; 9VE;I:NO3
g4~qcI=a
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \2xBOe-a]
{ }Xi#x*-D
//{{AFX_DATA_INIT(CAboutDlg) B7MW" y
//}}AFX_DATA_INIT ;x^,t@ xge
} wWU_?Dr_~
rcmAVl:$>
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Td1ba ^J
{ 5]l7Z35
CDialog::DoDataExchange(pDX); !u}3H|6~
//{{AFX_DATA_MAP(CAboutDlg) QCfpDE}
//}}AFX_DATA_MAP aX)./
} d$rUxqB.
KB R0p&MN
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uO(guA,C
//{{AFX_MSG_MAP(CAboutDlg) 6QXQ<ah"
// No message handlers bxSKe6l
//}}AFX_MSG_MAP N"RYM~c7
END_MESSAGE_MAP() cC^C7AAq^
8]":[s6x
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @) ZO$h
: CDialog(CCaptureDlg::IDD, pParent) 1bZiPG{
{ 6//FZ:q
//{{AFX_DATA_INIT(CCaptureDlg) %Rep6=K*$
m_bControl = FALSE; +c8AbEewg
m_bAlt = FALSE; ,/`E|eG1G
m_bShift = FALSE; iEVA[xy=D
m_Path = _T("c:\\"); T#G<?oF
m_Number = _T("0 picture captured."); (F[/~~
nCount=0; Tj21YK.mk
bRegistered=FALSE; j'Y"/<
bTray=FALSE; 04PoBv~g
//}}AFX_DATA_INIT .k,Jt+
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Cz@FZb8
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /;NE]{K
} ~8xh0TSi
)d(0Y<e@
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) XyM(@6,'
{ P%@rH@^Y
CDialog::DoDataExchange(pDX); :{b6M/
//{{AFX_DATA_MAP(CCaptureDlg) RmWfV
DDX_Control(pDX, IDC_KEY, m_Key); A!W"*WT
DDX_Check(pDX, IDC_CONTROL, m_bControl); \q|7,S,5
DDX_Check(pDX, IDC_ALT, m_bAlt); (#B^Hyz!
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6{ +_T
DDX_Text(pDX, IDC_PATH, m_Path); }u-S j/K
DDX_Text(pDX, IDC_NUMBER, m_Number); lIVxW+
//}}AFX_DATA_MAP w"a 9'r
} L;S*.Ol>
HIX=MprL<
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) qE`:b0FT
//{{AFX_MSG_MAP(CCaptureDlg) Z-t}6c'Kg
ON_WM_SYSCOMMAND() :-u-hO5*8
ON_WM_PAINT() G?-`>N-u
ON_WM_QUERYDRAGICON() qTTn51
ON_BN_CLICKED(ID_ABOUT, OnAbout) 9R@abm,I
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~+<xFi
ON_BN_CLICKED(ID_CHANGE, OnChange) 6I&j
cHH
//}}AFX_MSG_MAP a#Kmj0
END_MESSAGE_MAP() S@c\|
x'2 ,sE
BOOL CCaptureDlg::OnInitDialog() 4" ,
)zDk
{ 4aN+}TkH@G
CDialog::OnInitDialog(); P#[IUXtT
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4Hml.|$
ASSERT(IDM_ABOUTBOX < 0xF000); OgKWgvy
CMenu* pSysMenu = GetSystemMenu(FALSE); 0Q$~k
if (pSysMenu != NULL) 'je8k7`VA
{ ]^; b
CString strAboutMenu; B 9LSxB
strAboutMenu.LoadString(IDS_ABOUTBOX); ]M~8@K
if (!strAboutMenu.IsEmpty()) *f `s%&Y]s
{ i0'Xy>l
pSysMenu->AppendMenu(MF_SEPARATOR); U+.PuC[3
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .>kccLr:z
} a:yB%:2
} XhE$&Ff
SetIcon(m_hIcon, TRUE); // Set big icon abICoP1zQ
SetIcon(m_hIcon, FALSE); // Set small icon ,Um 5S6 Z
m_Key.SetCurSel(0); rT f lk
RegisterHotkey(); (F,(]71Z+
CMenu* pMenu=GetSystemMenu(FALSE); L2CW'Hd
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Gg}5$||^C
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7MO
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); gHi~nEH
return TRUE; // return TRUE unless you set the focus to a control qSEB}1
} D|TLTF"
wX)efLmyhY
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zP:~O
{ e{fZ}`=7y
if ((nID & 0xFFF0) == IDM_ABOUTBOX) _8[UtZYG
{ ;'=VrE6
CAboutDlg dlgAbout; X2\E9hJg
dlgAbout.DoModal(); X)Dqeb6
} U_x0KIm
else J 16=!q()
{ 1Q&cVxA"\
CDialog::OnSysCommand(nID, lParam); tLS<0
} E\R raPkQT
} Z!wD~C"D73
d[Rb:Yw
void CCaptureDlg::OnPaint() |h^K M
{ 2f3=?YqD
if (IsIconic()) v78&[
{ *>e~_{F
CPaintDC dc(this); // device context for painting 8?e
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |`w$|pm=
// Center icon in client rectangle 09R,'QJ|
int cxIcon = GetSystemMetrics(SM_CXICON); Lzh9DYU6
int cyIcon = GetSystemMetrics(SM_CYICON); <ZigCo w
CRect rect; M[h1>}$Lz
GetClientRect(&rect); ,^.S0;D,Z
int x = (rect.Width() - cxIcon + 1) / 2; s8t f@H4r
int y = (rect.Height() - cyIcon + 1) / 2; 5R,la\!bQ
// Draw the icon h`?y2?O
dc.DrawIcon(x, y, m_hIcon); Hs[}l_gYn
} o-SRSu
else C!!mOAhJ
{ H9%l?r5
CDialog::OnPaint(); *I:mw8t
} iY0,WT}&n
} J#6LSD@(O
n&_YYEHx
HCURSOR CCaptureDlg::OnQueryDragIcon() @<vF]\Ce
{ 4JGE2ArR
return (HCURSOR) m_hIcon; xJvLuzUD
} u=vh
Z%A]
8W-]t1O%!
void CCaptureDlg::OnCancel() }US7Nw
{ uyL72($
if(bTray) &}zRH}s;
DeleteIcon(); w`M]0'zls
CDialog::OnCancel(); HS{P?~:=U
} M'^(3#ZU
C0zrXhY_v
void CCaptureDlg::OnAbout() @(i*-u3Tq
{ -"F0eV+y
CAboutDlg dlg; 8dc538:q}
dlg.DoModal(); Lb!r(o>8Cb
} XK1fHfCEa
IK8%Q(.c
void CCaptureDlg::OnBrowse() xC)7eQn/R
{
^[en3aQ
CString str; 6/|U
BROWSEINFO bi; c2/FHI0J;
char name[MAX_PATH]; rW[SU:
ZeroMemory(&bi,sizeof(BROWSEINFO)); 'yE*|Sx
bi.hwndOwner=GetSafeHwnd(); `/c7h16
bi.pszDisplayName=name; u/} xE7G
bi.lpszTitle="Select folder"; .SG0}8gW
bi.ulFlags=BIF_RETURNONLYFSDIRS; y0;,dv]
LPITEMIDLIST idl=SHBrowseForFolder(&bi); gC0;2
if(idl==NULL) =Wj{]&`
return; O-Dc[t%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gyC^K3}
str.ReleaseBuffer(); JdtPY~k0
m_Path=str; <R>Q4&we(
if(str.GetAt(str.GetLength()-1)!='\\') NvcHv7,
m_Path+="\\"; 9KXym }
UpdateData(FALSE); QS\Uq(Ja\
} H]BAW *}
zgK;4
22$m
void CCaptureDlg::SaveBmp() Pfm*<,'x"[
{ )eECOfmnZ
CDC dc; 0X.TF
dc.CreateDC("DISPLAY",NULL,NULL,NULL); +hpSxdAz4
CBitmap bm; 0"TgLd
int Width=GetSystemMetrics(SM_CXSCREEN); Y7-*2"!
int Height=GetSystemMetrics(SM_CYSCREEN); <p09oZ{6
bm.CreateCompatibleBitmap(&dc,Width,Height); [qiOd!
CDC tdc; INOH{`}Ew
tdc.CreateCompatibleDC(&dc); N9pwWg&<+
CBitmap*pOld=tdc.SelectObject(&bm); dnix:'D1
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6zuze0ud
tdc.SelectObject(pOld); O"qR }W
BITMAP btm; 3i6h"Wu`n
bm.GetBitmap(&btm); \OP9_J(*
DWORD size=btm.bmWidthBytes*btm.bmHeight; (X*9w##x(
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E&'#=K[
BITMAPINFOHEADER bih; Oohq9f#!
bih.biBitCount=btm.bmBitsPixel; )qmFK
.;%
bih.biClrImportant=0; goB;EWz
bih.biClrUsed=0; gd
K*"U
bih.biCompression=0;
F,zG;_
bih.biHeight=btm.bmHeight; _1P`]+K\D$
bih.biPlanes=1; PzLJ/QER
bih.biSize=sizeof(BITMAPINFOHEADER); |Hfl&3
bih.biSizeImage=size; =C#*!N73
bih.biWidth=btm.bmWidth; G&jZ\IV
bih.biXPelsPerMeter=0; a/34WFC
bih.biYPelsPerMeter=0; 5.dl>,
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KhrFg1|
static int filecount=0; *(icR
CString name; Z&A0hI4d
name.Format("pict%04d.bmp",filecount++); RYH)AS4w'
name=m_Path+name; \ p3v#0R{
BITMAPFILEHEADER bfh; h<)yJh
bfh.bfReserved1=bfh.bfReserved2=0; )&Mq,@
bfh.bfType=((WORD)('M'<< 8)|'B'); ]9s\_A9
bfh.bfSize=54+size; [-Cu4mff
bfh.bfOffBits=54; :b5XKv^
CFile bf; W]zwghxH
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .ots?Ns
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2Q}7fht
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z#RuwB+
bf.WriteHuge(lpData,size); 2qlIy
bf.Close(); {a.
<`
nCount++; {gw[%[ZM
} pD[pTMG@$
GlobalFreePtr(lpData); QhsVIta
if(nCount==1) }YRO'Q{
m_Number.Format("%d picture captured.",nCount); hox< vr4
else j-QGOuvW
m_Number.Format("%d pictures captured.",nCount); $,@JYLC2
UpdateData(FALSE); y`6\L$c
} Gp8psH
fQO
""qh
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U:\p$ hL9
{ BtzYA"
if(pMsg -> message == WM_KEYDOWN) F*,5\s<
{ mVt3WZa
if(pMsg -> wParam == VK_ESCAPE) ncj!KyU
return TRUE; #hy+ L
if(pMsg -> wParam == VK_RETURN) AC'lS
>7s
return TRUE; >P<'L4;
} zC#%6@P\
return CDialog::PreTranslateMessage(pMsg); 2
ZK%)vq0
} m2Q$+p@
i\ "{#
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :Pf>Z? /d
{ WI{ ;#A
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &y\igX1
SaveBmp(); (Igu:=
return FALSE; #n#HzbT
} >x*)GPDa
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ FllX za)
CMenu pop; `6}Yqh))
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5#2jq<D
CMenu*pMenu=pop.GetSubMenu(0); #Skj#)I"
pMenu->SetDefaultItem(ID_EXITICON); *{4
ETr7
CPoint pt; bJPJ.+G7
GetCursorPos(&pt); 6#vI;d[^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `
jyKCm.$#
if(id==ID_EXITICON) &//2eL
DeleteIcon(); TA| s@T{
else if(id==ID_EXIT) ?9Ma^C;}
OnCancel(); E>"8/
return FALSE; ($'V&x8T
} .lr5!Stb
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #"<?_fao~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J
3B`Krh
AddIcon(); H nd+l)ng
return res; 7gr^z)${J
} GL`tOD:P"
0#^Bf[Dn
void CCaptureDlg::AddIcon() ,Y-S(
{ [4: Yi{>
NOTIFYICONDATA data; q~M2:SN@X
data.cbSize=sizeof(NOTIFYICONDATA); OT@yPG
CString tip; _@K YF)
tip.LoadString(IDS_ICONTIP); 7f*
RM
data.hIcon=GetIcon(0); r>O|L%xpv
data.hWnd=GetSafeHwnd(); \OY}GRKt
strcpy(data.szTip,tip); ol }`Wwy
data.uCallbackMessage=IDM_SHELL; TL'0T,Jo
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }/"4|U
data.uID=98; %/!+(7
D
Shell_NotifyIcon(NIM_ADD,&data); <]'|$8&jY
ShowWindow(SW_HIDE); V)h
y0_
bTray=TRUE; o} {-j
} =ajLa/m'
"&<~UiI
void CCaptureDlg::DeleteIcon() R>HY:-2
{ }1@E"6kF
NOTIFYICONDATA data; ^cn@?k((A
data.cbSize=sizeof(NOTIFYICONDATA); #a'r_K=ch)
data.hWnd=GetSafeHwnd(); sG1BNb_
data.uID=98; ST%
T =_q
Shell_NotifyIcon(NIM_DELETE,&data); s??czM2O
ShowWindow(SW_SHOW); yV2e5/i
SetForegroundWindow(); wASX\D }
ShowWindow(SW_SHOWNORMAL); GFt1
bTray=FALSE; yquAr$L!
} ]x_F{&6U8
GV>&g
void CCaptureDlg::OnChange() q :8\e
{ K_&_z
RegisterHotkey(); vpV$$=Qwp
} Qsji0ikG
37jQ'O
U
BOOL CCaptureDlg::RegisterHotkey() LihdZ )
{ TzY*;
UpdateData(); KSsWjF}d
UCHAR mask=0; w5(yCyNp~
UCHAR key=0; =x#&\ui
if(m_bControl) I^:F)a:
mask|=4; O8y9dX-2
if(m_bAlt) `x2,;h!:)N
mask|=2; & g$rrpTzv
if(m_bShift) 73)Ll"(
mask|=1; ZPvf-PqJl
key=Key_Table[m_Key.GetCurSel()]; CW;m
if(bRegistered){ ,5w]\z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); DJ|BM+
bRegistered=FALSE; rKT)!o'
} ?Q?598MC
cMask=mask;
#Qsk}Gv
cKey=key; X Ny
Y$
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1a*6ZGk.
return bRegistered; kC31$jMC3!
} H:{?3gk.P3
0R4akLW0
四、小结 &~ y{'zoL
N6q5`Ry
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。