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:
( eKgc
/V,xSK9.& 一、实现方法
z 3aGK ^$ Y9.IH" 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:
7.29' :^y!z1\2(7 #pragma data_seg("shareddata")
$5pCfW8> HHOOK hHook =NULL; //钩子句柄
kgo#JY-4 UINT nHookCount =0; //挂接的程序数目
J2qsZ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
LtRRX@qJw static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
ExG(*[l static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
3l=q@72 static int KeyCount =0;
htB7 j( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
h@`Rk #pragma data_seg()
}{F)Ren q=3>ij{v 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
H?"M&mF d.+*o DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
{\5(aQ)Vi5 CmB_g?K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
+Q+O$-a< cKey,UCHAR cMask)
XH%pV {
eV"%(<{ BOOL bAdded=FALSE;
oEX,\@+u for(int index=0;index<MAX_KEY;index++){
wm@j(h4 if(hCallWnd[index]==0){
P|Aac,nE+^ hCallWnd[index]=hWnd;
pwN2Nzski HotKey[index]=cKey;
d~8U1}dP HotKeyMask[index]=cMask;
=b%f@x_U1 bAdded=TRUE;
L$=R/l KeyCount++;
HwFg;r break;
_4>DuklH, }
*z[vp2
TN }
!sX$?P%U return bAdded;
z<eu=OD4t }
k*A(7qQA`4 //删除热键
+jE)kaV% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
&m--} {
1te^dh:Vp BOOL bRemoved=FALSE;
eY3:Nl^ for(int index=0;index<MAX_KEY;index++){
j#f/M3 if(hCallWnd[index]==hWnd){
)#AYb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"1s ]74 hCallWnd[index]=NULL;
{APfSD_4 HotKey[index]=0;
w}1IP- HotKeyMask[index]=0;
/6rjGc bRemoved=TRUE;
7Q/H+) KeyCount--;
.45wwouZkc break;
K21Xx`XK }
S+06pj4Ie }
|Kd6.Mx }
lSR\wz*Fk return bRemoved;
d*+}_EV)Y3 }
OyDoktz$) Wqv7 Mzg3i* DLL中的钩子函数如下:
9]3l' ?e-rwaW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-v9 (43 {
5tv*uz|fv BOOL bProcessed=FALSE;
X)SUFhP\ if(HC_ACTION==nCode)
3R/6/+S- {
!& c%!* if((lParam&0xc0000000)==0xc0000000){// 有键松开
=x w:@(]{ switch(wParam)
|g7)A?2J~ {
+PYR case VK_MENU:
<;i&-, MaskBits&=~ALTBIT;
3=]/+{B break;
rKPsv*w case VK_CONTROL:
e~QLzZ3 MaskBits&=~CTRLBIT;
_`Kh8G
{e break;
&h[)nD case VK_SHIFT:
AkjoD7.* MaskBits&=~SHIFTBIT;
7#
'j>] break;
L,_U co default: //judge the key and send message
&[\zs&[@y break;
>`30 ib }
yq3"VFh3d for(int index=0;index<MAX_KEY;index++){
R7Tl1!,h if(hCallWnd[index]==NULL)
jM*wm~4>@ continue;
a
w~a/T: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$.DD^ "9 {
;F_&h#D]3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/x-tl)(s= bProcessed=TRUE;
&m(eMX0lU }
P)TeF1~T }
kH=~2rwm }
W6B o\UK else if((lParam&0xc000ffff)==1){ //有键按下
*|+ ~V/# switch(wParam)
bVRxGn @l {
<.7W:s,f= case VK_MENU:
YS"76FJ MaskBits|=ALTBIT;
Y!E|X 3 break;
e ]>{?Z case VK_CONTROL:
mR{%f?B MaskBits|=CTRLBIT;
F7x< V=4{ break;
s|!b: Ms` case VK_SHIFT:
A&'HlI%J MaskBits|=SHIFTBIT;
/=OSGIJzm break;
Hi{!<e2 default: //judge the key and send message
C vTgtZ
' break;
CQY/q@7 }
qf]OSd for(int index=0;index<MAX_KEY;index++){
"ZVBn!
if(hCallWnd[index]==NULL)
ZoC?9=k continue;
j1toV$)P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
UE\@7 {
%@M/)"k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
o9HDxS$~^ bProcessed=TRUE;
[dL?N }
e$(i!G) }
s.dn~|a }
{_MU0=7c\ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
f{Y|FjPp=E for(int index=0;index<MAX_KEY;index++){
=Jl1D*B* if(hCallWnd[index]==NULL)
!r!Mq~X<= continue;
kk5i{.?[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
)@`w^\E_~_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+TX
p;6pA //lParam的意义可看MSDN中WM_KEYDOWN部分
Sdt2D }
;1OTK6 }
f&cG;Y
}
qaGIU`}:$A return CallNextHookEx( hHook, nCode, wParam, lParam );
C1rCKKh }
U ._1'pW +#H8d1^5 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
c!\y\r |]\bgh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{}^ELw BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
zB]T5] hJ4.: 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
x?<5=, K((Kd&E LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
`oz7Q(` {
FW.dHvNX if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
=nL*/ {
nG*6ic //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
IFTW,9hh SaveBmp();
RK3/!C`
return FALSE;
=K>Z{%i }
i:8^:(i …… //其它处理及默认处理
imhq*f#A[ }
c _a$g l{a&Zy) jRkq^} 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。
pz
IMj_ .M{[J]H`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。
|O9=C`G_ XZ&v3ul 二、编程步骤
enz Q}^ &"h!SkX/ 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";
$B?7u@>, .nH
/=
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
uY~A0I5Z |\(/dXXP 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;
bX(*f>G' #"{8Z&Z 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;
e,*[5xQ &P3vcB 5、 添加代码,编译运行程序。
Aii[=x8 oCYD@S>h 三、程序代码
KTEis!w MX0B$yc$ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
A,e^bM
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
!~l%6Z5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
\veL 5 #if _MSC_VER > 1000
%$xFnGb #pragma once
4"{wga~%/ #endif // _MSC_VER > 1000
%nh'F6bNgv #ifndef __AFXWIN_H__
VC(|t} L4 #error include 'stdafx.h' before including this file for PCH
P[K=']c #endif
swFOh5z #include "resource.h" // main symbols
(F YJ^o class CHookApp : public CWinApp
q_&IZ,{Vk {
vNSf:5H$ public:
FO=1P7 CHookApp();
b]#d04] // Overrides
j2M(W/_ // ClassWizard generated virtual function overrides
$SVGpEw //{{AFX_VIRTUAL(CHookApp)
8!6*|!,:?n public:
I}IW!K virtual BOOL InitInstance();
se HbwO3 b virtual int ExitInstance();
>NA7,Z2. //}}AFX_VIRTUAL
8|NJ(D-$ //{{AFX_MSG(CHookApp)
oLMi vy4 // NOTE - the ClassWizard will add and remove member functions here.
,P@-DDJ // DO NOT EDIT what you see in these blocks of generated code !
30E v" //}}AFX_MSG
Sg>0P*K@ DECLARE_MESSAGE_MAP()
x 4</\o };
F:S>\wG, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
o~&!M_ED BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
am+mXb BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Jk`)`94I BOOL InitHotkey();
3og$'#6P BOOL UnInit();
(v:ek_ #endif
oD@jtd>b% -z$2pXT ^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
S)@vl^3ec #include "stdafx.h"
;S`-9}6 #include "hook.h"
'\B"g@if #include <windowsx.h>
h)^A3;2F #ifdef _DEBUG
gCr|e}w- #define new DEBUG_NEW
zn1Rou]6 #undef THIS_FILE
vcO`j<` static char THIS_FILE[] = __FILE__;
@[lc0_b #endif
]=VS~azZ5 #define MAX_KEY 100
eSNSnh]' #define CTRLBIT 0x04
5qkuKF #define ALTBIT 0x02
Wx)U<:^e #define SHIFTBIT 0x01
R 0HVLQI #pragma data_seg("shareddata")
CN~NyJL H HHOOK hHook =NULL;
65#:2,s UINT nHookCount =0;
etMh=/NFV static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
\R\@t]>Y static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
'F"Y?y:! static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
uE#,c\[8 static int KeyCount =0;
Jhy
t)@7/, static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
D>b5Uwt #pragma data_seg()
(2bZ] HINSTANCE hins;
_<RR` void VerifyWindow();
&_/%2qs BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
3u0<v%Qi //{{AFX_MSG_MAP(CHookApp)
pNE\@U|4E // NOTE - the ClassWizard will add and remove mapping macros here.
vd7N&c9 // DO NOT EDIT what you see in these blocks of generated code!
L@n6N|[_ //}}AFX_MSG_MAP
9me}&Fdr END_MESSAGE_MAP()
Iei7!KLW A9l})_~i CHookApp::CHookApp()
=Cy>$/H64 {
/E{dM2 // TODO: add construction code here,
G k"L%Zt) // Place all significant initialization in InitInstance
H]$=*(aje }
gr`Ar; DxKfWb5 R CHookApp theApp;
Wd`
QpW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
p=_XMh`; {
"vOfAo]` BOOL bProcessed=FALSE;
n^pZXb;Y if(HC_ACTION==nCode)
7XVzd]jH {
Ly)(_Tp@+ if((lParam&0xc0000000)==0xc0000000){// Key up
1 73<x){ switch(wParam)
7}'A)C>J; {
}x?H ~QQT case VK_MENU:
|v$%V#Bo MaskBits&=~ALTBIT;
:\+{;;a@ break;
^\[LrPqe case VK_CONTROL:
w~$c= JO# MaskBits&=~CTRLBIT;
..q63dr break;
HLSfoQ&)v case VK_SHIFT:
tSb?]J MaskBits&=~SHIFTBIT;
833%H`jQc break;
H\=LE default: //judge the key and send message
8{G?92
{rN break;
vdH+>l }
P('t6MVlT for(int index=0;index<MAX_KEY;index++){
I>H;o{X# if(hCallWnd[index]==NULL)
lP@) continue;
3_L1Wm if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
xi?P(sA {
lHcZi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.lvI8Jf~X bProcessed=TRUE;
vr{'FMc }
QOT)x4!) }
%wt2F-u }
:T7? else if((lParam&0xc000ffff)==1){ //Key down
>,>;)B@J switch(wParam)
a1g6}ym\ {
y8w0eq94 case VK_MENU:
oNuPP5d[] MaskBits|=ALTBIT;
&0+x2e)7g break;
9u?)vR[@e case VK_CONTROL:
&r'{(O8$N MaskBits|=CTRLBIT;
CJ9cCtA break;
<H5n>3#pH case VK_SHIFT:
c$Xe.:QY MaskBits|=SHIFTBIT;
l_c^ .D break;
Hs"%
S default: //judge the key and send message
a[1sA12 break;
]{IR&{EI- }
5c:'> for(int index=0;index<MAX_KEY;index++)
8%o~4u3 {
Hva2j<h if(hCallWnd[index]==NULL)
x7"z(rKl continue;
8^/+wa+G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Dq/3E-y5 {
VLcyPM@"Q! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4 ,p#:! bProcessed=TRUE;
F2IC$:e
M }
`OKo=e~, }
xi680' }
d?:`n9` if(!bProcessed){
|x &Z~y for(int index=0;index<MAX_KEY;index++){
2X|CuL{] if(hCallWnd[index]==NULL)
H1`
rM^,%A continue;
bnijM/73 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+w "XNl SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9v~1We;{$ }
pO"m~ mpA }
hzaLx8L }
luW
<V> return CallNextHookEx( hHook, nCode, wParam, lParam );
|/@0~O(6 }
c}\
'x5:o d,)}+G BOOL InitHotkey()
B-!guf
rnY {
fC_zX}3 if(hHook!=NULL){
+x(YG(5\w nHookCount++;
oG!6}5 return TRUE;
'.pgXsC:=? }
y k?SD1hj else
%fHH{60 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
8{oZi]ob if(hHook!=NULL)
4Mk8Cpz nHookCount++;
Jf2e<?` return (hHook!=NULL);
F
y b[{" }
g{e/X~ BOOL UnInit()
'r~8 {
5)w4)K-% if(nHookCount>1){
Zw+=ng.q? nHookCount--;
&9RH}zv6 return TRUE;
zei6S }
d$}&nV/A) BOOL unhooked = UnhookWindowsHookEx(hHook);
4bnt=5] if(unhooked==TRUE){
f6Ml[!aU nHookCount=0;
N8VVGPa hHook=NULL;
k!&:(] }
&1P(O\d return unhooked;
J2m"1gq, }
+@e
}mL\8 SgiDh dE BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
DE%fF,Hk3 {
((qGh>* BOOL bAdded=FALSE;
" rsSW3_ for(int index=0;index<MAX_KEY;index++){
8yn4}`Nc@ if(hCallWnd[index]==0){
^;+[8:Kb hCallWnd[index]=hWnd;
}B`Ku5 M HotKey[index]=cKey;
!:3^ hb HotKeyMask[index]=cMask;
[P{a_( bAdded=TRUE;
sZKEUSFD # KeyCount++;
CI^[I\$& break;
7{4w2) }
SyAo,
)j }
f~q4{ return bAdded;
m^Glc?g< }
44~hw: ;,k=<] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/[%w*v*' {
r_^)1w BOOL bRemoved=FALSE;
~q 7;8<U for(int index=0;index<MAX_KEY;index++){
-G-3q6A if(hCallWnd[index]==hWnd){
o,1Dqg4P3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
uaaf9SL? hCallWnd[index]=NULL;
;g+]klR! HotKey[index]=0;
n}JPYu HotKeyMask[index]=0;
NO2(vE bRemoved=TRUE;
nM8[ KeyCount--;
s9i|mVtm8 break;
2e59Ez%k6 }
<UT>PCNG }
q(H ip<6p }
!p',Za return bRemoved;
%m`zWg- }
dw9T f ^V nR[^|CAR void VerifyWindow()
m*dNrG {
dxCPV6 XI for(int i=0;i<MAX_KEY;i++){
8Q=ZH=SQK if(hCallWnd
!=NULL){ _~&9*D$
{>
if(!IsWindow(hCallWnd)){ D:9
2\l
hCallWnd=NULL; @PX\{6&
HotKey=0; moZm0`WR
HotKeyMask=0; ugLlI2 nJ
KeyCount--; _{)9b24(
} "}zt`3
} Hhl-E:"H`
} "%@v++4y
} o2naVxetE
:$%>4+l
BOOL CHookApp::InitInstance() (` c
G
{ Oaa"T8t
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^~1<f1(
hins=AfxGetInstanceHandle(); vy9dAl
InitHotkey(); S&wzB)#'
return CWinApp::InitInstance(); T$mbk3P
} EI1?
GB)b
>{nH v)
int CHookApp::ExitInstance() q7_+}"i
{ 7u|B ](FS
VerifyWindow();
#^0(
UnInit(); Ej"u1F14J
return CWinApp::ExitInstance(); h/m6)m.D
} `]<`$71w
!0"nx{7.
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file i=rH7k
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,b|-rU\
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pj8azFZ
#if _MSC_VER > 1000 G%:GeW
#pragma once yWb4Ify
#endif // _MSC_VER > 1000 ^ R~~L
GBQn_(b9I
class CCaptureDlg : public CDialog <]U1\~j
{ tj5giQ3DG)
// Construction @D[`Oj)
public: N`$!p9r
BOOL bTray; m4m<nnM
BOOL bRegistered; QJBr6
BOOL RegisterHotkey(); @dEiVF`4:
UCHAR cKey; 4 b,N8
UCHAR cMask; 4XJiIa?
void DeleteIcon(); J2M(1g)t9
void AddIcon(); SSA W52xC
UINT nCount; lm0N5(XP
void SaveBmp(); Adx`8}N8
CCaptureDlg(CWnd* pParent = NULL); // standard constructor &JhX+'U
// Dialog Data l,`!rF_
//{{AFX_DATA(CCaptureDlg) qTmD'2
enum { IDD = IDD_CAPTURE_DIALOG }; $>q@SJ1q
CComboBox m_Key; 'jfRt-_-
BOOL m_bControl; m9":{JI.w
BOOL m_bAlt; s V
}+eU
BOOL m_bShift; 3yO=S0`
CString m_Path; h{'t5&yY
CString m_Number; ?Bx./t><
//}}AFX_DATA 3z8C
// ClassWizard generated virtual function overrides ]?LB?:6
//{{AFX_VIRTUAL(CCaptureDlg) #wR;|pN
public: ))T>jh
virtual BOOL PreTranslateMessage(MSG* pMsg); h~}.G{"
protected: F-
rQ3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {?8B,G2r
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CIC[1,
//}}AFX_VIRTUAL MaY682}|y
// Implementation q|(W-h+
protected: /-M@[p&
HICON m_hIcon; T.:+3:8|F
// Generated message map functions \}"m'(\c
//{{AFX_MSG(CCaptureDlg) 5iX!
lAFJ
virtual BOOL OnInitDialog(); WF2-$`x
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MuI2?:~:*4
afx_msg void OnPaint(); K[?Xm"4
afx_msg HCURSOR OnQueryDragIcon(); TnH\O$
virtual void OnCancel(); nt
:N!suP3
afx_msg void OnAbout(); Ud(`V:d
afx_msg void OnBrowse(); pdVQ*=c?M
afx_msg void OnChange(); j`>^1Q
//}}AFX_MSG zJN7<sv
DECLARE_MESSAGE_MAP() L^`}J7r
};
zj{s}*
#endif Xrqx\X
%Y nmuZ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W;_E 4
#include "stdafx.h" T6BFX0$
#include "Capture.h" !cX[-}Q
#include "CaptureDlg.h" n# 7Pr/*0
#include <windowsx.h> zTm]AG|0
#pragma comment(lib,"hook.lib") >{zk
qvsQ&
#ifdef _DEBUG ?&+9WJ<M
#define new DEBUG_NEW t67Cv/r~
#undef THIS_FILE ['qnn|
static char THIS_FILE[] = __FILE__; >l5$ 9wO
#endif [:EvTY
#define IDM_SHELL WM_USER+1 X[$++p
.
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I/J7rkf
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vm1-C<V9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3251Vq %
class CAboutDlg : public CDialog f>$``.O
{ s][24)99
public: |UUdz_i!:
CAboutDlg(); ){;02^tX
// Dialog Data dFXc/VH')
//{{AFX_DATA(CAboutDlg) n~IVNB*
enum { IDD = IDD_ABOUTBOX }; ~aK?cP
//}}AFX_DATA (g!p>m!Z
// ClassWizard generated virtual function overrides es:2M |#O
//{{AFX_VIRTUAL(CAboutDlg) RVw9Y*]b
protected: NZLAk~R;0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |UnUG
//}}AFX_VIRTUAL 3,X/,'
// Implementation ,El!fgL
protected: y(jg#7)
//{{AFX_MSG(CAboutDlg) #\rwLpC1u
//}}AFX_MSG (=x"Y{%
DECLARE_MESSAGE_MAP() \E1U@6a
}; g=@_Z"
:3h{ A`u
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .x83Ah`
{ A#wEuX=[
//{{AFX_DATA_INIT(CAboutDlg) sN=6 gCau
//}}AFX_DATA_INIT <U Zd;e@
} %:v`EjRD0
{}~: &.D
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [tT8_}v$LN
{ g2cVZ!GIj
CDialog::DoDataExchange(pDX); I<oL}f
//{{AFX_DATA_MAP(CAboutDlg) ~EiH-z4U
//}}AFX_DATA_MAP Dr<='Ux[5
} QbFHfA2Ij
IIFMYl gF
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +|cI:|H>
//{{AFX_MSG_MAP(CAboutDlg) c~}l8M%
// No message handlers U%<rn(xWXD
//}}AFX_MSG_MAP XKOUQc4!R
END_MESSAGE_MAP() n
1b(\PA
a
dfR!&J
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l~:v
(R5
: CDialog(CCaptureDlg::IDD, pParent) R6;Phdh<>
{ )KSoq/
//{{AFX_DATA_INIT(CCaptureDlg) 6c4&VW
m_bControl = FALSE; ,$*IzL~
m_bAlt = FALSE; =HDI \LD<
m_bShift = FALSE; h+~P"i}&\
m_Path = _T("c:\\"); iOw3MfO
m_Number = _T("0 picture captured."); , :n|
?7
nCount=0; [4Ll0GSp
bRegistered=FALSE; E`\8TqO
bTray=FALSE; M+>`sj
//}}AFX_DATA_INIT )P&9A)8
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nv0@xnbz
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D|bBu
} AIl4]F5I
^WYQ]@rh3
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;#+0L$<t
{ <~emx'F|
CDialog::DoDataExchange(pDX); UM%o\BiO
//{{AFX_DATA_MAP(CCaptureDlg) fG LG$b
DDX_Control(pDX, IDC_KEY, m_Key); @`"AHt
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8ip7^
DDX_Check(pDX, IDC_ALT, m_bAlt); ^ZeJ[t&!#
DDX_Check(pDX, IDC_SHIFT, m_bShift); km5~Gc}
DDX_Text(pDX, IDC_PATH, m_Path); 8;P2A\X
DDX_Text(pDX, IDC_NUMBER, m_Number); K<sC F[
//}}AFX_DATA_MAP 9<Eg}Ic
} D87|q4
$P
o}
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E|EgB33S
//{{AFX_MSG_MAP(CCaptureDlg) H!IshZfktn
ON_WM_SYSCOMMAND() Ds8
EMtS
ON_WM_PAINT() *4Fr&^M\
ON_WM_QUERYDRAGICON() j=+"Qz/hr_
ON_BN_CLICKED(ID_ABOUT, OnAbout) b4 #R!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *ZSdl0e
ON_BN_CLICKED(ID_CHANGE, OnChange) i8X`HbmN
//}}AFX_MSG_MAP zdun,`6
END_MESSAGE_MAP() Xk mQBV"
vEe NW
BOOL CCaptureDlg::OnInitDialog() Bvjl-$m!v
{ L#[]I,
CDialog::OnInitDialog(); .ae O}^
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zzGYiF?
ASSERT(IDM_ABOUTBOX < 0xF000); 4pU>x$3$
CMenu* pSysMenu = GetSystemMenu(FALSE); R\Z:n*
if (pSysMenu != NULL) T5Eseesp
{ &:B<Q$g#
CString strAboutMenu; &xZyM@
strAboutMenu.LoadString(IDS_ABOUTBOX); kdx
y\
jA
if (!strAboutMenu.IsEmpty()) qa >Ay|92e
{ =ziwxIo6
pSysMenu->AppendMenu(MF_SEPARATOR); W1aa:hEf
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); th5g\h%j*
} [ee%c Xo
} $K~LM8_CKy
SetIcon(m_hIcon, TRUE); // Set big icon ,38Eq`5&W
SetIcon(m_hIcon, FALSE); // Set small icon 'rP]Nw
m_Key.SetCurSel(0); |dE
-^"_
RegisterHotkey(); {Z;t ^:s#
CMenu* pMenu=GetSystemMenu(FALSE); _A_ A$N~9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [f~N_G6I^o
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `Kl`VP=c
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =TvzS%U
return TRUE; // return TRUE unless you set the focus to a control }1 vT)
} 3B0lb"e
2LY=DL7
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Mq%,lJA\
{ rd|uz4d
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;)0w:Zn/[
{ `:{B(+6
CAboutDlg dlgAbout; 9<CG s3\
dlgAbout.DoModal(); d?,M/$h
} eHg3}b2r
else ,FQdtNMap
{ %%%fL;-y
CDialog::OnSysCommand(nID, lParam); z+2V4s =
} =/Aj
} ']6VB,c`
%5Kq^]q;Y
void CCaptureDlg::OnPaint() i@"e,7mSG
{ Z@D*1\TG=
if (IsIconic()) /G{_7cb
{ 1MkI0OZE
CPaintDC dc(this); // device context for painting P3tx|:gV
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Doze8pn
// Center icon in client rectangle +';>=hha
int cxIcon = GetSystemMetrics(SM_CXICON); ri~<~oB2:
int cyIcon = GetSystemMetrics(SM_CYICON); Z5G!ct:W
CRect rect; n_K~vD
GetClientRect(&rect); (n(
fI f
int x = (rect.Width() - cxIcon + 1) / 2; 1,y&d}GW
int y = (rect.Height() - cyIcon + 1) / 2; 0O!cN_l|
// Draw the icon WUdKLx%F
dc.DrawIcon(x, y, m_hIcon); UnWW/]E
} EEy$w1ec
else lw%?z/HDf
{ @* 1U{`
CDialog::OnPaint(); @!=\R^#p
} uw\1b.r'B
} \@a$'
RH)EB<PV
HCURSOR CCaptureDlg::OnQueryDragIcon() D.!~dyI.,$
{ }SyxPXs
return (HCURSOR) m_hIcon; +WJ(QZEhD
} lB8il2&
UsVMoX^
void CCaptureDlg::OnCancel() :)f7A7 :;
{ Ha>*?`?yI
if(bTray) z5\;OLJS,
DeleteIcon(); z1OFcqm
CDialog::OnCancel(); =?0lA_
0
} ]6Ug>>x5
pI+!92Z
void CCaptureDlg::OnAbout() iItcN;;7
{ |C \}P
CAboutDlg dlg; {X]R-1>
dlg.DoModal(); ".*x!l0y7
} 0x2!<z
RNVbcd
void CCaptureDlg::OnBrowse() /{2*WI;
{ ge3sU5iZ
CString str; 8cx=#Me
BROWSEINFO bi; fpyz'
char name[MAX_PATH]; Cm$1$?J
ZeroMemory(&bi,sizeof(BROWSEINFO)); f},oj4P\
bi.hwndOwner=GetSafeHwnd(); 0X2@CPIFf
bi.pszDisplayName=name; Q~D`cc|]
bi.lpszTitle="Select folder"; jo+w>
bi.ulFlags=BIF_RETURNONLYFSDIRS; ]Hj<IvG
LPITEMIDLIST idl=SHBrowseForFolder(&bi); TjK{9A
if(idl==NULL) 3q[WHwmm
return; - "*r
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); NIr@R7MKd
str.ReleaseBuffer(); @xsP5je]
m_Path=str; -u!qrJ*Z
if(str.GetAt(str.GetLength()-1)!='\\') v<\A%
m_Path+="\\"; .Jb$l$5'w
UpdateData(FALSE); Dz=k7zRg"
} a\uie$"cr]
/(I*,.d
void CCaptureDlg::SaveBmp() ~\nBjM2
{ v}G]X Z8
CDC dc; kU5.iK'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); (<t_Pru
CBitmap bm; :A46~UA!$
int Width=GetSystemMetrics(SM_CXSCREEN); V5"CSMe
int Height=GetSystemMetrics(SM_CYSCREEN); ;Lw{XqT
bm.CreateCompatibleBitmap(&dc,Width,Height); 2g*J
CDC tdc; R)?{]]v
tdc.CreateCompatibleDC(&dc); ln*icaDqf
CBitmap*pOld=tdc.SelectObject(&bm); R`Aj|C
z
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); pZZgIw}aS
tdc.SelectObject(pOld); XB hb`AG
BITMAP btm; Mkp/0|Q*
bm.GetBitmap(&btm); +,+vkpL-%
DWORD size=btm.bmWidthBytes*btm.bmHeight; !U_K&f
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $ZPX]2D4B#
BITMAPINFOHEADER bih; u/b7Z`yX}
bih.biBitCount=btm.bmBitsPixel; (%CZ*L[9Z
bih.biClrImportant=0; L(;WxHL
bih.biClrUsed=0; {C`GW}s{4
bih.biCompression=0; )|j[uh6wo
bih.biHeight=btm.bmHeight; js^ ,(CS
bih.biPlanes=1; F+UG'4%
bih.biSize=sizeof(BITMAPINFOHEADER); 2 gq$C"
bih.biSizeImage=size; yn
AB
bih.biWidth=btm.bmWidth; EO|:FcW
bih.biXPelsPerMeter=0; ?[TfpAtQ`
bih.biYPelsPerMeter=0; e;bYaM4UX
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (w(
static int filecount=0; idc`p?XP
CString name; lA!"z~03*
name.Format("pict%04d.bmp",filecount++); ,:Jus
name=m_Path+name; EqiFy"H
BITMAPFILEHEADER bfh; 3H\w2V
bfh.bfReserved1=bfh.bfReserved2=0; M`,~ mU
bfh.bfType=((WORD)('M'<< 8)|'B'); m .IU ;cR
bfh.bfSize=54+size; P`4]-5gE
bfh.bfOffBits=54; C-eA8pYY/
CFile bf; gieN9S
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i=a-<A5x
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); N(6|yZ<J3M
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |LG4=j.l
bf.WriteHuge(lpData,size); `cz2DR-"
bf.Close(); %m,6}yt
nCount++; <>eOC9;VY
} in <(g@Zg
GlobalFreePtr(lpData); "eWk#/
if(nCount==1) {U]H;~3 ?
m_Number.Format("%d picture captured.",nCount); ;rI@*An
else ',3HlOJ:
m_Number.Format("%d pictures captured.",nCount); B0$:b!
UpdateData(FALSE); ^VW
PdH/Fe
} rVvR!"//yH
hDP/JN8y
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 75nNh~?)\
{ Ft=zzoVKg
if(pMsg -> message == WM_KEYDOWN) NqHy%'R
{ 5wB =>
if(pMsg -> wParam == VK_ESCAPE) *,C(\!b
!?
return TRUE; JTqDr
if(pMsg -> wParam == VK_RETURN) C$Lu]pIL*
return TRUE; 7*Qk`*Ii
} N- e$^pST
return CDialog::PreTranslateMessage(pMsg); mC&=X6Q]
} (@X~VACT
-50HB`t
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3<=,1 cU
{ B!{d-gb
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -m'j]1
SaveBmp(); 76tdJ!4Z
return FALSE; g
6]epp[8
} h'J|K^na
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :(dHY
CMenu pop; kp?w2+rz
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gK#mPcn^
CMenu*pMenu=pop.GetSubMenu(0); M7f;Pa
pMenu->SetDefaultItem(ID_EXITICON); eD$M<Eu
CPoint pt; J{ [n?/A{
GetCursorPos(&pt); Z UKf`m[
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kP#e((f,
if(id==ID_EXITICON) d\e7,"L*Q
DeleteIcon(); hLJM%on
else if(id==ID_EXIT) iu**`WjI\
OnCancel(); _0+0#! J!
return FALSE; 7\_o.(g#-
} $'W}aER
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }:: S0l
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tg^sCxz9]
AddIcon(); 01!s"wjf
return res; *5tO0_L
} ) 9,
y(R?
,wa=]
void CCaptureDlg::AddIcon() q'pK,uNW
{ bo.(zAz
NOTIFYICONDATA data; \xg]oKbn
data.cbSize=sizeof(NOTIFYICONDATA); '|;X0fD
CString tip; '`'GK&)
tip.LoadString(IDS_ICONTIP); (E,T#uc{
data.hIcon=GetIcon(0); E{6~oZ#L
data.hWnd=GetSafeHwnd(); yH][(o=2
strcpy(data.szTip,tip); p=/m
data.uCallbackMessage=IDM_SHELL; IwGqf.!.>
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; A^Kbsc
data.uID=98; kyR*D1N&)
Shell_NotifyIcon(NIM_ADD,&data); !lo/xQ<
ShowWindow(SW_HIDE); aq7~QX_0G
bTray=TRUE; >#ZUfm{k$
} c1X1+b,
u!1{Vt87
void CCaptureDlg::DeleteIcon() QMv@:Eo
{ U%0Ty|$Y
NOTIFYICONDATA data; 1+?^0%AC
data.cbSize=sizeof(NOTIFYICONDATA); Wg`R_>qQSm
data.hWnd=GetSafeHwnd(); zB yqD$
data.uID=98; SkU9ON
Shell_NotifyIcon(NIM_DELETE,&data); 8p[)MiC5W^
ShowWindow(SW_SHOW); vn/.}GkpU
SetForegroundWindow(); s/089jlc
ShowWindow(SW_SHOWNORMAL); #^+DL]*l
bTray=FALSE; (sWLhUgRX
} q -8t'7
Ty88}V
void CCaptureDlg::OnChange() \9-"M;R.d
{ {v3P9s(
RegisterHotkey(); w3jO6*_ M
} |7x\m t
F5S@I;
BOOL CCaptureDlg::RegisterHotkey() DBP9{ x$
{ \d::l{VB
UpdateData(); s&'QN=A
UCHAR mask=0; jt+iv*2N>
UCHAR key=0; ^pHq66d%Z
if(m_bControl) V59(Z
mask|=4; $AHQmyg<
if(m_bAlt) S6fb f>[
mask|=2; I}R0q
if(m_bShift) fFQ|T:vm
mask|=1; 6AocmR0D'
key=Key_Table[m_Key.GetCurSel()]; qe5feky
if(bRegistered){ $\9~)Rq6
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5h; +Ky!I
bRegistered=FALSE; 4[N^>qt =
} CirZ+o
cMask=mask; GgKEP,O
cKey=key; 2#k5+?-c61
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '(/7[tJ
return bRegistered; Q|@4bz i)
} ~g.$|^,.O/
IsR!'%Pu
四、小结 Kv~U6_=1O
fDSv?crv
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。