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:
T`wDdqWbEG
O
Ol: 一、实现方法
nrMW5>&-` >)<? 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:
Q&.uL}R 0zNbux_ #pragma data_seg("shareddata")
@\w}p E HHOOK hHook =NULL; //钩子句柄
{)"[_< UINT nHookCount =0; //挂接的程序数目
V3ozaVk; static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I3.. Yk%7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
uCr& ` static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
BJwuN static int KeyCount =0;
F8Ety^9>9 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
"6\5eFN; #pragma data_seg()
z.8 nYL5^} WGn=3(4 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。
$,@}%NlHc g_cED15 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
x3&gB`j-
GGEM&0* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
iGhvQmd(/* cKey,UCHAR cMask)
e:Y+-C5 {
vQLYWRXiA BOOL bAdded=FALSE;
uX1; for(int index=0;index<MAX_KEY;index++){
={;pg( if(hCallWnd[index]==0){
't`h?VvL hCallWnd[index]=hWnd;
y/\b0& HotKey[index]=cKey;
}qM^J;uy HotKeyMask[index]=cMask;
53{\H&q bAdded=TRUE;
TiI /I`A KeyCount++;
l SdA7 break;
8^}/T#l }
E#+2)Q }
RJ@79L*# return bAdded;
?)-6~p 4N }
Mc.{I"c@ //删除热键
j%s,%#al BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@$r[$D
v {
**%&|9He BOOL bRemoved=FALSE;
$x'jf?zs! for(int index=0;index<MAX_KEY;index++){
pL1ABvBB if(hCallWnd[index]==hWnd){
Rb:H3zh if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
x3cjyu<K hCallWnd[index]=NULL;
r%f Q$q> HotKey[index]=0;
%]}JWXof HotKeyMask[index]=0;
?pZU'5le` bRemoved=TRUE;
C33Jzn's KeyCount--;
GP c
B( break;
Kg';[G\ }
l%2VA }
Kj4BVs }
7FoX)54" return bRemoved;
Y:;_R=M }
9SsVJ<9,R d[9{&YnH ! ;/$pxD DLL中的钩子函数如下:
|1!fuB A tV(iC~/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-:%QoRCy {
C/Q20 BOOL bProcessed=FALSE;
0a89<yX if(HC_ACTION==nCode)
UUDUda {
+@?Q "B5u} if((lParam&0xc0000000)==0xc0000000){// 有键松开
>`UqS`YQK switch(wParam)
dP_QkO {
Ag9GYm case VK_MENU:
1ARtFR2C{b MaskBits&=~ALTBIT;
}{N#JTmjB# break;
'O)v@p " case VK_CONTROL:
<@(\z
MaskBits&=~CTRLBIT;
>u>
E !5O break;
b\ED<' case VK_SHIFT:
:bct+J}l~ MaskBits&=~SHIFTBIT;
O80Z7 break;
T+Re1sPr? default: //judge the key and send message
Oh1U=V2~ break;
]7_>l> }
Hj>9 #>b for(int index=0;index<MAX_KEY;index++){
Y9X,2L7V if(hCallWnd[index]==NULL)
E>QS^)ih continue;
S|tA%2z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Db Qp(W0 {
2x<BU3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
fQib?g/G bProcessed=TRUE;
M
_<
|n }
n R, QG8 }
THq}>QI }
|_p7vl" else if((lParam&0xc000ffff)==1){ //有键按下
>97YK = switch(wParam)
CbM~\6R {
NOs00 H case VK_MENU:
?MFC(Wsh
MaskBits|=ALTBIT;
C'[4jz0xF break;
{2 q"9Ox" case VK_CONTROL:
[!%5(Ro_ MaskBits|=CTRLBIT;
t`Bk2Cc)+ break;
} 9zi5o8 case VK_SHIFT:
o=Z:0Ukl] MaskBits|=SHIFTBIT;
1oO(;--u_ break;
;U4O` pZ default: //judge the key and send message
}}k%.Qb break;
x~}&t+FK }
x} =,'Ko}3 for(int index=0;index<MAX_KEY;index++){
wp }Q4I if(hCallWnd[index]==NULL)
ys[xR=nbD continue;
]mtiIu[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~s&r.6DW {
t+A*Ws*o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
^ulgZ2BQ| bProcessed=TRUE;
/95z1e }
!QVhP+l'H }
).jQ+XE'> }
!:\0}w$- if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4Mg%}/cC for(int index=0;index<MAX_KEY;index++){
w%`S>+kX& if(hCallWnd[index]==NULL)
spP[S"gI continue;
| t:UpP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
uSXnf SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RDSC @3% //lParam的意义可看MSDN中WM_KEYDOWN部分
l7T?Yx j }
SVVE b6& }
?wkT=mv }
G!VEV3zT return CallNextHookEx( hHook, nCode, wParam, lParam );
W>!:K^8] }
!j7mY9x+ AB%i|t 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:
"
l|`LjP5M [H\0
' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
r[ k BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<[ dt2)%L> " TCJT390 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:
h(kPf]0 wclj9&k LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
k+[oYd {
rx|
,DI if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
4j0;okQWV' {
8cZ[Kl% //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
g
\S6>LG! SaveBmp();
F\&wFA'J return FALSE;
N>EMVUVS }
,k.") …… //其它处理及默认处理
j{FRD8]V
}
7)D[ }UXz b'^<0c V"8Go;[ 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。
&&$*MHJ
3-{WFnA 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
b&E"r*i|
M3UC9t9] 二、编程步骤
J0k!&d8 Tr>_R%b K 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
9E5*%Hu_ yT<"?S>D 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
n'vdA !R ? .B t. 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
m==DBh z+oy#p6+F. 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
7~"eT9WV i,~(_|-r 5、 添加代码,编译运行程序。
rg[#( +Goh`!$Rj9 三、程序代码
xC
+>R1) ])qnPoQ<n ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
4J'0k<5S #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
(ZF~
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
HrLws95' #if _MSC_VER > 1000
_~1O #*|4 #pragma once
eCJtNPd #endif // _MSC_VER > 1000
<}&J|() #ifndef __AFXWIN_H__
!b0A%1W; #error include 'stdafx.h' before including this file for PCH
yo_zc< #endif
J s33S) #include "resource.h" // main symbols
i0\]^F class CHookApp : public CWinApp
rvhMu}. {
FDF DB public:
x/]G"?Uix CHookApp();
6E^m*la% // Overrides
(oCpQDab@ // ClassWizard generated virtual function overrides
8rJf2zL //{{AFX_VIRTUAL(CHookApp)
ORX<ZOt1 public:
o4a@{nt^, virtual BOOL InitInstance();
!+Cc^{ virtual int ExitInstance();
bly `mp8# //}}AFX_VIRTUAL
3LQu+EsS //{{AFX_MSG(CHookApp)
?^:5` // NOTE - the ClassWizard will add and remove member functions here.
}|/<!l+;$ // DO NOT EDIT what you see in these blocks of generated code !
e
GAto //}}AFX_MSG
3`3my= DECLARE_MESSAGE_MAP()
qMVuBv
};
8:I-?z;S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
StNA(+rT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&!:mL], BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u9q#L.Ij BOOL InitHotkey();
U7zd7O BOOL UnInit();
`|nJAW3 #endif
v8\_6}*I E2o8'.~Yd` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
" 5Pqvi #include "stdafx.h"
ou)0tX3j #include "hook.h"
"kc%d'c( #include <windowsx.h>
0"\js:-$ #ifdef _DEBUG
yHf^6|$8 #define new DEBUG_NEW
{J)gS #undef THIS_FILE
T{3-H(-gA static char THIS_FILE[] = __FILE__;
OS(Ua #endif
w?fq%-6f* #define MAX_KEY 100
R%t6sbsNv #define CTRLBIT 0x04
R SWw4} #define ALTBIT 0x02
YuO!Y9iEm #define SHIFTBIT 0x01
Cvt/ot-J? #pragma data_seg("shareddata")
F`gK6;zp HHOOK hHook =NULL;
ER!s UINT nHookCount =0;
jX$U)O static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
lUnC+w#[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
LChwHkRHJI static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
=`MQKh, static int KeyCount =0;
|gk"~D static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
LDo~ #pragma data_seg()
)ARV>( HINSTANCE hins;
FgP{ void VerifyWindow();
+*qTZIXj BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Y,4?>:39J //{{AFX_MSG_MAP(CHookApp)
K.? S,qg // NOTE - the ClassWizard will add and remove mapping macros here.
%gqu7}' // DO NOT EDIT what you see in these blocks of generated code!
Ql}#mC.>/ //}}AFX_MSG_MAP
sx[mbKj< END_MESSAGE_MAP()
ZI :wJU:f D_z&G) CHookApp::CHookApp()
|n s9ziTDI {
`ST;";7! // TODO: add construction code here,
N4yQ,tG>aa // Place all significant initialization in InitInstance
LmR OG-9 }
C91'dM R6o07.] CHookApp theApp;
&oVZ2.O#( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
k^UrFl {
2mthUq9b* BOOL bProcessed=FALSE;
h5E<wyd96. if(HC_ACTION==nCode)
caTKi8 {
?|<p^: if((lParam&0xc0000000)==0xc0000000){// Key up
u]3VK switch(wParam)
i#U_g:~wC {
9M[ case VK_MENU:
DQN"85AIZ MaskBits&=~ALTBIT;
w*Ze5j4@
\ break;
eg"!.ol case VK_CONTROL:
!*k'3rKOW MaskBits&=~CTRLBIT;
`LTD|0; break;
2F,?}jJ.K case VK_SHIFT:
unN*L MaskBits&=~SHIFTBIT;
riglEA[^ break;
FePWr7Ze default: //judge the key and send message
RDqQ6(e" break;
:WSszak }
OOz;/kay for(int index=0;index<MAX_KEY;index++){
y<8o!=Tb5 if(hCallWnd[index]==NULL)
@A%\;oo continue;
/ Kj;% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2+\@0j[q {
?+{qmqN SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2:^ bProcessed=TRUE;
f5CnJhE|) }
<oTNo>U/k }
\T`iq[+6 }
d^aLue>g;+ else if((lParam&0xc000ffff)==1){ //Key down
0o?2Sf`L\* switch(wParam)
=fK F#^E@ {
LgSVEQb6\| case VK_MENU:
<qx qlEQT MaskBits|=ALTBIT;
s(Fxi|v; break;
S#ud<=@!9 case VK_CONTROL:
2cJ3b
0Xx MaskBits|=CTRLBIT;
N!af1zj break;
iS8yJRy case VK_SHIFT:
u,S}4p&l MaskBits|=SHIFTBIT;
2C&l\16 break;
MOP#to)k& default: //judge the key and send message
.|J-(J<>[. break;
8&y3oxA, }
Et"B8@'P for(int index=0;index<MAX_KEY;index++)
<K~mg<ff$ {
z]Mu8 if(hCallWnd[index]==NULL)
Si[xyG6= continue;
uI&<H T? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IlP@a[:_ {
0p \,}t\E SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
wArtg'=X bProcessed=TRUE;
[/eRc }
'miY"L:| O }
|Z{
DU(?[b }
q;qY#wD@ if(!bProcessed){
JiHk`e` for(int index=0;index<MAX_KEY;index++){
eRwm>l"fVV if(hCallWnd[index]==NULL)
^Ea^t.c}_ continue;
R)5zHCwOw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
h<f]hJ`ep SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U3ao:2zP }
gl"1;C }
~f!iz~ }
R`emI7| return CallNextHookEx( hHook, nCode, wParam, lParam );
DWar3+u&0 }
0%hOB: !PY.FnZ BOOL InitHotkey()
bp(X\:zAy {
"+ 8Y{T if(hHook!=NULL){
?Kf?Z`9 *Y nHookCount++;
"0A !fRI~ return TRUE;
L+$9 ,<'[ }
T! fF1cpF\ else
gJI(d6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
CXiSin if(hHook!=NULL)
9^1.nE(R& nHookCount++;
j.y8H return (hHook!=NULL);
E6y ?DXWH }
73d7'Fw BOOL UnInit()
i_qR&X {
R4g% $} if(nHookCount>1){
srfM"Lb' nHookCount--;
dWAKIBe return TRUE;
1Igo9rv }
=L?(mNHT BOOL unhooked = UnhookWindowsHookEx(hHook);
<gc\,P<ru if(unhooked==TRUE){
hiA%Tq? nHookCount=0;
B<uUf)t hHook=NULL;
H$n{|YO ` }
C@[f Z return unhooked;
:%vD
hMHa }
$X:r&7t+Q[ /tGj`C&qtw BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ZQPv@6+oY {
X`FFI6pb BOOL bAdded=FALSE;
v %fRq!~ for(int index=0;index<MAX_KEY;index++){
LZG~1tf if(hCallWnd[index]==0){
#}{1>g{sXt hCallWnd[index]=hWnd;
Yv [j5\:x HotKey[index]=cKey;
C~aNOe
WR HotKeyMask[index]=cMask;
}
h pTS_ bAdded=TRUE;
Y^W.gGM KeyCount++;
$s-HG[lX[ break;
\+B+M 7 }
Q:~>$5Em5 }
9&uWj'%ia return bAdded;
(VzabO }
`^7ARr/ LlfD>cN BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
DsP FBq {
?~>#(Q BOOL bRemoved=FALSE;
(qM(~4|` for(int index=0;index<MAX_KEY;index++){
=W~K_jE5lo if(hCallWnd[index]==hWnd){
w %sHA if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
tag~SG`ov hCallWnd[index]=NULL;
/*8Ms` HotKey[index]=0;
?3
l4U HotKeyMask[index]=0;
tv1Z%Mx?Cp bRemoved=TRUE;
=8F]cW'1` KeyCount--;
SXx2 break;
7VQk$im399 }
T m0m$l }
BejeFV3 }
7 Ed6o return bRemoved;
p;VHg }
L3g}Z1<!$ s!d"(K9E void VerifyWindow()
4d*=gy% {
1Gojuey for(int i=0;i<MAX_KEY;i++){
y-iuOzq4 if(hCallWnd
!=NULL){ \y
G//
if(!IsWindow(hCallWnd)){ eQUm!9)
hCallWnd=NULL; *[eh0$
HotKey=0; ,mE*k79L6
HotKeyMask=0; P`K?k<
KeyCount--; &91U(Go
} k*8
ld-O
} HjO-6F#s
} cH!w;Ub]
} {)QSxO
*MEDV1l_T
BOOL CHookApp::InitInstance() n"1LVJN7
{ z5G$'
AFX_MANAGE_STATE(AfxGetStaticModuleState()); G3&l|@5
hins=AfxGetInstanceHandle(); P'4jz&4
InitHotkey(); mqg[2VTRP
return CWinApp::InitInstance(); +h$)l/>:
} J \@yP
2Rp5 E^s
int CHookApp::ExitInstance() .7*3V6h =F
{ ~fE6g3
VerifyWindow(); Zw[A1!T,
UnInit(); ;{e ;6Hq
return CWinApp::ExitInstance(); K)AJx"
} Q`dzn=
[CU]fU{$
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]oN:MS4r
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5mD]uB9
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vbeYe2;(
#if _MSC_VER > 1000 _O-ZII~
#pragma once uV:;q>XM'%
#endif // _MSC_VER > 1000 xYJ|G=h&A
os]P6TFFX?
class CCaptureDlg : public CDialog o1"MW>B,4
{ 72gQ<Si
// Construction ly<1]jK
public: Ed%8| M3
BOOL bTray; J0e~s
BOOL bRegistered; RfMrGC^?
BOOL RegisterHotkey(); (P-Bmu!s
UCHAR cKey; {:VUu?5-t;
UCHAR cMask; szY=N7\S*
void DeleteIcon(); k{op ,n#
void AddIcon(); |d* K'+
UINT nCount; '=_}&
void SaveBmp(); ]Y'oxh
CCaptureDlg(CWnd* pParent = NULL); // standard constructor |uT&`0T'e`
// Dialog Data Kzw)Q
//{{AFX_DATA(CCaptureDlg) H
h4G3h0
enum { IDD = IDD_CAPTURE_DIALOG }; F]hKi`@
CComboBox m_Key; s:j"8ZH
BOOL m_bControl; ==[a7|q
BOOL m_bAlt; $ePBw~yu
BOOL m_bShift; I$o^F/RH
CString m_Path; *;~*S4/P
CString m_Number; / ;U
//}}AFX_DATA LV'@JFT-
// ClassWizard generated virtual function overrides 9Se7
1
//{{AFX_VIRTUAL(CCaptureDlg) ^ $M@yWX6
public: HeagT(rN'
virtual BOOL PreTranslateMessage(MSG* pMsg); K; 7o+Xr
protected: (LW4z8e#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S+Aq0B<
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5YlY=J
//}}AFX_VIRTUAL DlkHE8r\
// Implementation (GVH#}uB
protected: =|lKB;
HICON m_hIcon; NzmVQ-4
// Generated message map functions Fg3VD(D^U
//{{AFX_MSG(CCaptureDlg) v(vLk\K7
virtual BOOL OnInitDialog(); *TpzX
y
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P<+5So0
afx_msg void OnPaint(); KWVEAHIn
afx_msg HCURSOR OnQueryDragIcon(); un4q,Ac~0
virtual void OnCancel(); %rpJZ
t
afx_msg void OnAbout(); F)we^'X
afx_msg void OnBrowse(); 6t0!a@t
afx_msg void OnChange(); G:f\wK[
//}}AFX_MSG "#H@d+u
DECLARE_MESSAGE_MAP() J`T1 88
}; (~~*PT-
#endif !%' 1x2?
}s_'q~R
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1nv#Ehorg
#include "stdafx.h" S4j` =<T,
#include "Capture.h" j +j2_\
#include "CaptureDlg.h" *t{$GBP
#include <windowsx.h> LFsrqdzJ
#pragma comment(lib,"hook.lib") #"^F:: b-
#ifdef _DEBUG VZ?"yUZ Id
#define new DEBUG_NEW oyGO!j
#undef THIS_FILE 3"O)"/"Q.
static char THIS_FILE[] = __FILE__; CKShz]1
#endif |sN>/89=/
#define IDM_SHELL WM_USER+1 [E_eaez7#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~+1t3M e
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m>C}T
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $2uZdl8Rvj
class CAboutDlg : public CDialog
>:whNp
{ "HRoS#|\
public:
uqy b
CAboutDlg(); M{U {iS
// Dialog Data J`U\3:b`SP
//{{AFX_DATA(CAboutDlg) X|'E yZ
enum { IDD = IDD_ABOUTBOX }; |=C&JA
//}}AFX_DATA O2|[g8(_F
// ClassWizard generated virtual function overrides tZS-e6*S
//{{AFX_VIRTUAL(CAboutDlg) huTa
Ei
protected: j rX.e
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MP|J 0=H5
//}}AFX_VIRTUAL (9_~R^='y
// Implementation cqzd9L6=
protected: `6KTQk'
//{{AFX_MSG(CAboutDlg) ;b=3iT-2"
//}}AFX_MSG 8}/v[8p
DECLARE_MESSAGE_MAP() (f DA
}; E|ce[|2
60KhwD1
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
Tu Q@b
{ N=J$+
//{{AFX_DATA_INIT(CAboutDlg) xjHOrr
OQ
//}}AFX_DATA_INIT ~7$E\w6
} SST1vzm!
/5^"n4/M
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k}-@N;zq
{ p@H]F<
CDialog::DoDataExchange(pDX); Cx $M
//{{AFX_DATA_MAP(CAboutDlg) <szD"p|K
//}}AFX_DATA_MAP nJJ9>#<g$
} Nf0'>`/
%vjLw`
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Mg
H,"G
//{{AFX_MSG_MAP(CAboutDlg) (?SK< 4!
// No message handlers !r:X`~\a
//}}AFX_MSG_MAP t.sbfLu
END_MESSAGE_MAP() O$}p}%%y7
v\Zni4
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) tGGv 2TCEy
: CDialog(CCaptureDlg::IDD, pParent) T+z]ztO
{ pK=$)<I"6
//{{AFX_DATA_INIT(CCaptureDlg) 90)0\i+P
m_bControl = FALSE; w
^ v*1KA&
m_bAlt = FALSE; ViV"+b#gu
m_bShift = FALSE; }."3&u't
m_Path = _T("c:\\"); fsU6o4
m_Number = _T("0 picture captured."); G%
wVQ|1
nCount=0; 7XKPC+)1ya
bRegistered=FALSE; Vv=/{31
bTray=FALSE; AV0m31b
//}}AFX_DATA_INIT nQuiRTU<
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 b #U
nE
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); vn"2"hPF|
} SFrQPdX6V
E#t;G:+A
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 82%~WQnS
{ #s JE{Tb
CDialog::DoDataExchange(pDX); p[BF4h{E
//{{AFX_DATA_MAP(CCaptureDlg)
kt8P\/~*i
DDX_Control(pDX, IDC_KEY, m_Key); V[-4cu,Ph^
DDX_Check(pDX, IDC_CONTROL, m_bControl); ^06f\7A
DDX_Check(pDX, IDC_ALT, m_bAlt); w9I7pIIl
DDX_Check(pDX, IDC_SHIFT, m_bShift); %(a<(3r
DDX_Text(pDX, IDC_PATH, m_Path); a!MhxM5
DDX_Text(pDX, IDC_NUMBER, m_Number); L8K=Q
//}}AFX_DATA_MAP 5y7rY!]Bf
} #3@ Du(_n
R<VNbm;
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [%(}e1T(
//{{AFX_MSG_MAP(CCaptureDlg) ]M
AB
ON_WM_SYSCOMMAND() W:q79u yX
ON_WM_PAINT() 5t]}(.0+
ON_WM_QUERYDRAGICON() +TW9BU'a^
ON_BN_CLICKED(ID_ABOUT, OnAbout)
ta]B9&c
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) SVsLu2tVY
ON_BN_CLICKED(ID_CHANGE, OnChange)
%"GF+
//}}AFX_MSG_MAP t0_o.S
END_MESSAGE_MAP() J(*qOGBD
aY 8"Sw|4
BOOL CCaptureDlg::OnInitDialog() >jEn>H?
{ Xz)UH<
CDialog::OnInitDialog(); hzIP ?0^E
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {@Y|"qIN
ASSERT(IDM_ABOUTBOX < 0xF000); h8;B +#f`
CMenu* pSysMenu = GetSystemMenu(FALSE); 6~8A$:
if (pSysMenu != NULL) 1{N73]-M:
{ `YTagUq7
CString strAboutMenu; 70NQ9*AAy
strAboutMenu.LoadString(IDS_ABOUTBOX); %M{qr!?uj
if (!strAboutMenu.IsEmpty()) z -|gw.y
{ pKDP1S#<
pSysMenu->AppendMenu(MF_SEPARATOR); 8Xpf|?.
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K8NoY6
} u"IYAyzL
} }qy,/<R
SetIcon(m_hIcon, TRUE); // Set big icon ~m^.&mv3/
SetIcon(m_hIcon, FALSE); // Set small icon ~ZeF5
m_Key.SetCurSel(0); (9:MIP
RegisterHotkey(); 6@pPaq6
CMenu* pMenu=GetSystemMenu(FALSE); xW@y=l Cu
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `ER">@&
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O+I\Q?
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +jzwi3B`
return TRUE; // return TRUE unless you set the focus to a control O]{3aMs!Y
} VU+` yQp
IXb]\ )
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) } ).rD
{ mG4myQ?$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) XMb]&VvH
{ nR)/k,3W
CAboutDlg dlgAbout; 1e`/N+6u
dlgAbout.DoModal(); x`8rR;N!
} H..g2;D
else P3|_RHIb
{
4\'1j|nS[
CDialog::OnSysCommand(nID, lParam); pG?AwB~@n
} `N$:QWJ
} 3nb&Z_/e
VW^6qf/,
void CCaptureDlg::OnPaint() ConXP\M-
{ ^VsX9
if (IsIconic()) ~!( (?8"
{ +2%ih!
CPaintDC dc(this); // device context for painting lSv?!2
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2E~WcB
// Center icon in client rectangle W.OcmA>x
int cxIcon = GetSystemMetrics(SM_CXICON); om%L>zfB
int cyIcon = GetSystemMetrics(SM_CYICON); );T0n
CRect rect; C^ngdba\
GetClientRect(&rect); \l^L?69
int x = (rect.Width() - cxIcon + 1) / 2; :^7P. lhK
int y = (rect.Height() - cyIcon + 1) / 2; e?W-vi%
// Draw the icon %lVc7L2]
dc.DrawIcon(x, y, m_hIcon); lej-,HX
} ~`'!nzP5H
else `.3!
{ kO:|?}Koc
CDialog::OnPaint(); 8S2sNpLi-g
} *`~
woF
} dQUZ11
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HCURSOR CCaptureDlg::OnQueryDragIcon() P:GAJ->;]>
{ >B)&mC$$S
return (HCURSOR) m_hIcon; oRl~x^[%[-
} [JAHPy=+w
>TSPEvWc
void CCaptureDlg::OnCancel() eF]`?AeWQ
{ P{YUW~
if(bTray) Vfkm{*t)
DeleteIcon(); hV5Aw;7C
CDialog::OnCancel(); O
<;Au|>*
} kTQ.7mo/\'
\Eq,4-q
void CCaptureDlg::OnAbout() up+W[#+
{ v+a$Xh3Y~
CAboutDlg dlg; (,Zy2wr=
dlg.DoModal(); BJGL &N
} 5,/rh,?
3m
RP.<=
void CCaptureDlg::OnBrowse() Dep.Qfv{-
{ tHF-OarUO
CString str; yW::`
BROWSEINFO bi; j8k5B"
char name[MAX_PATH]; >b2j j+8
ZeroMemory(&bi,sizeof(BROWSEINFO)); Jg3OMUt
bi.hwndOwner=GetSafeHwnd(); FT.6^)-
bi.pszDisplayName=name; #-76E
bi.lpszTitle="Select folder"; vW`Dy8`06
bi.ulFlags=BIF_RETURNONLYFSDIRS; "B18|#v
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,;3#}OGg
if(idl==NULL) }yQ&[Mt
return; P2y`d9,Q
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l=EnK"aU
str.ReleaseBuffer(); =T_E]>FF9
m_Path=str; UQq,Xq
if(str.GetAt(str.GetLength()-1)!='\\') YU=Q`y[k
m_Path+="\\"; bf1Tky=/
UpdateData(FALSE); ODvlix
} U^qQ((ek
p
mv6m
void CCaptureDlg::SaveBmp() 0,1x-
yD
{ F@m]Imn5Dx
CDC dc; m]C|8b7Y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); OIi8x?
.~]
CBitmap bm; >Z0F n
int Width=GetSystemMetrics(SM_CXSCREEN); xJCMxt2Y
int Height=GetSystemMetrics(SM_CYSCREEN); X[' VZz7
bm.CreateCompatibleBitmap(&dc,Width,Height); E
P1f6ps
CDC tdc; 71euRIW'5
tdc.CreateCompatibleDC(&dc); gcS?r :
CBitmap*pOld=tdc.SelectObject(&bm); x`7Ch3`4}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);
|tK_Bn
tdc.SelectObject(pOld); 9W^sq<tR
BITMAP btm; b&q!uFP
bm.GetBitmap(&btm); D~~"wos
DWORD size=btm.bmWidthBytes*btm.bmHeight; I,[njlO:
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Jo%`N#jG
BITMAPINFOHEADER bih; g.L~Z1-
bih.biBitCount=btm.bmBitsPixel; ^\<nOzU?
bih.biClrImportant=0; \X3Q,\H
@
bih.biClrUsed=0; JONfNb+
bih.biCompression=0; X#;n Gq)5
bih.biHeight=btm.bmHeight; h%4aL38
bih.biPlanes=1; \!O3]k,r
bih.biSize=sizeof(BITMAPINFOHEADER); UA>3,|gV1
bih.biSizeImage=size; i}&&rr
bih.biWidth=btm.bmWidth; Y-Iu&H+\
bih.biXPelsPerMeter=0; !H)$_d \uj
bih.biYPelsPerMeter=0; |nOqy&B
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;Dh\2! sr
static int filecount=0; z@bq*':~J
CString name; ++9?LH4S4
name.Format("pict%04d.bmp",filecount++); DIsK+1
name=m_Path+name; -DVoO2|Dv
BITMAPFILEHEADER bfh; u{|
Q[hf[
bfh.bfReserved1=bfh.bfReserved2=0; X`/GiYTu
bfh.bfType=((WORD)('M'<< 8)|'B'); @wvgMu
bfh.bfSize=54+size; aPU.fER
bfh.bfOffBits=54; >(E C.ke
CFile bf; ?<F=*eS
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .[8!
E_
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /,C;fT<R
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); KjWF;VN*[3
bf.WriteHuge(lpData,size); ,=_)tX^
bf.Close(); e>$d*~mwn
nCount++; Y"{L&H `
} Bb[WtT}=
GlobalFreePtr(lpData); @euH[<
if(nCount==1) %fbV\@jDCX
m_Number.Format("%d picture captured.",nCount); <K
g=?wb
else <v=$A]K
m_Number.Format("%d pictures captured.",nCount); LDDgg
u
UpdateData(FALSE); >m$jJlAv8
} /Dd.C<F
W8blHw"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `}r)0,Z}3
{ xL&evG#
if(pMsg -> message == WM_KEYDOWN) LiG!xs
{ pwF+ZNo
if(pMsg -> wParam == VK_ESCAPE) ^_4e^D]P"
return TRUE; /EIQMZuYp
if(pMsg -> wParam == VK_RETURN) Ob ~7w[n3
return TRUE; kC,=E9)O
} 8=K%7:b
return CDialog::PreTranslateMessage(pMsg); C33BP}c]
} hQeGr2gMq
xNrPj8V<Y
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /M :7
{ qw?Wi%t(x8
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uI9eUO
SaveBmp(); `e`}dgf0S|
return FALSE; D%`O.2T Y|
} !1b}M/Wx
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ir\P[A
CMenu pop; E,kDy:
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9T\uOaC"
CMenu*pMenu=pop.GetSubMenu(0); @$Xl*WT7
pMenu->SetDefaultItem(ID_EXITICON); @=7[ KM b
CPoint pt; 'fK3L<$z#m
GetCursorPos(&pt); vw'xmzgA
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C6?({
QB@
if(id==ID_EXITICON) !"g2F}n
DeleteIcon(); FNN7[ku!
else if(id==ID_EXIT) YujR}=B!/
OnCancel(); *M? [Gro/
return FALSE; \?D~&d,a=
} oW5Ov
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 70GwTK.{~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =.`:jZG
AddIcon(); |Q(3rcOrV"
return res; pqCp>BO?O
} C3K":JB
!V'~<&
void CCaptureDlg::AddIcon() }ed{8"bj
{ .9u0WP95
NOTIFYICONDATA data; 2M+}o"g
data.cbSize=sizeof(NOTIFYICONDATA); lC=-1*WH
CString tip; 9bQD"%ha=d
tip.LoadString(IDS_ICONTIP); <e?1&5 6
data.hIcon=GetIcon(0); 4<j7F4
data.hWnd=GetSafeHwnd(); ynZp|'b?<
strcpy(data.szTip,tip); M=M~M$K
data.uCallbackMessage=IDM_SHELL; zv-9z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; R?3N><oh*
data.uID=98; c
W1`[b
Shell_NotifyIcon(NIM_ADD,&data); j].=,M<dxE
ShowWindow(SW_HIDE); S`Xx('!/|
bTray=TRUE; }Ug O$1
} Q\nIU7:bZ
@CtnV|
void CCaptureDlg::DeleteIcon() Akdx1h,
{ u}">b+{!
NOTIFYICONDATA data; ,bxGd!&{Q
data.cbSize=sizeof(NOTIFYICONDATA); 4Uk\h gT0
data.hWnd=GetSafeHwnd(); z j F'CY
data.uID=98; e#AmtheZR
Shell_NotifyIcon(NIM_DELETE,&data); XxY wBc'pc
ShowWindow(SW_SHOW); hAV@/oQ
SetForegroundWindow(); dw-o71(1d
ShowWindow(SW_SHOWNORMAL); Pil_zQ4
bTray=FALSE; !DM GAt\
} ${ 5E
fB)S: f|
void CCaptureDlg::OnChange() 7Y%Si5
{ K0{
,*>C
RegisterHotkey(); to{7B7t>q
} >g;995tG
+ MtxS l
BOOL CCaptureDlg::RegisterHotkey() 7<*,O&![|
{ 35H.ZXQp-
UpdateData(); aH&Efz^
UCHAR mask=0; RhWW61!"
UCHAR key=0; g5;Ig
if(m_bControl) zEKVyZd*{
mask|=4; m++=FsiX=
if(m_bAlt) Lng@'Yr
mask|=2; _]zH4o<p
if(m_bShift) #Y0ru9
mask|=1; 6u9?
key=Key_Table[m_Key.GetCurSel()]; Fr_6pEH]}
if(bRegistered){ d3]<'B:nb
DeleteHotkey(GetSafeHwnd(),cKey,cMask); >rYkVlv
bRegistered=FALSE; P9o=G=i
} >x1yFwX}-f
cMask=mask; 7fC:'1]G
cKey=key; _7;D0l
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M2nWvU$
return bRegistered; 489xoP
} G-TD9OgZ
%l3f .
四、小结 \iA.{,VX
9DmFa5E
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。