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:
G#*;3X$ }1P 一、实现方法
hU{%x#8}lK 1 &<@(S< 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:
WveFB%@`; ;D7jE+ #pragma data_seg("shareddata")
cG'Wh@ HHOOK hHook =NULL; //钩子句柄
2S4z$(x3 UINT nHookCount =0; //挂接的程序数目
}ie]7N6; static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
tQ67XAb static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
2P}RZvUd static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
N@$%0! static int KeyCount =0;
`4qKQJw static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
~83P09\T% #pragma data_seg()
\v_C7R;& on\\;V_/Q 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。
jo*9QO ihVQ,Cth 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:
){:aGGtko pS\>X_G3 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
68*{Lo?U cKey,UCHAR cMask)
v2'JL(= {
:S12=sFl$ BOOL bAdded=FALSE;
i.] zq for(int index=0;index<MAX_KEY;index++){
Q:\hh=^ if(hCallWnd[index]==0){
as4NvZ@+r hCallWnd[index]=hWnd;
Cs{f'I HotKey[index]=cKey;
M\f0
=`g HotKeyMask[index]=cMask;
D,/9rH bAdded=TRUE;
)QD}R36Ic KeyCount++;
v3Yj2LSqx break;
+IYSWR }
MVdx5,t }
ErC[Zh"'' return bAdded;
"_j7kYAl }
)[*O^bPowI //删除热键
_O%p{t'q< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(SK5pU {
*lAdS]I BOOL bRemoved=FALSE;
m5N&7qgp for(int index=0;index<MAX_KEY;index++){
8A .7=C' z if(hCallWnd[index]==hWnd){
. $YF|v[= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Fr3t[:D hCallWnd[index]=NULL;
(q N(#~ HotKey[index]=0;
bf/loMtD HotKeyMask[index]=0;
,v_r$kh^ bRemoved=TRUE;
rbbuSI KeyCount--;
':]a.yA\1 break;
H~]o]uAi" }
TP::y }
jqWvLBU! }
D:tZiS=0 return bRemoved;
q&T'x> / }
|"w<CKlQ W2h[NimU cV,Dl`1r DLL中的钩子函数如下:
FSs$ ]
d; MPN=K|* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
m?$G(E5 {
`|Z@UPHzG BOOL bProcessed=FALSE;
I>Fh*2 if(HC_ACTION==nCode)
\|`Pul$ {
z %E!tB2o if((lParam&0xc0000000)==0xc0000000){// 有键松开
z|)1l` switch(wParam)
y/hvH"f {
&W//
Ox
)f case VK_MENU:
Z3>3&|& MaskBits&=~ALTBIT;
os^SD&hL break;
^)^|;C\` case VK_CONTROL:
]},Q`n>$ MaskBits&=~CTRLBIT;
mIEaWE;E" break;
q<[ke
case VK_SHIFT:
dt&Lwf/ MaskBits&=~SHIFTBIT;
4Xk;Qd break;
<D;Q8 default: //judge the key and send message
L$c%u break;
E/$@ud|l" }
P3ev4DL for(int index=0;index<MAX_KEY;index++){
X]U"ru{1q if(hCallWnd[index]==NULL)
LY:?OGh continue;
IYg3ve`x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N<"6=z@w+ {
x][9ptrh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
|SukiXJZF bProcessed=TRUE;
r9a!,^}F }
Hs-.83V }
AnE_<sPA }
@j2*.ee else if((lParam&0xc000ffff)==1){ //有键按下
pXj/6+^ switch(wParam)
@TPgA(5NR {
_6S
b.9m case VK_MENU:
2n;;Tso" MaskBits|=ALTBIT;
f(s3TLM break;
/0&:Yp=> case VK_CONTROL:
C\^<v& MaskBits|=CTRLBIT;
D)ne *}, break;
fy=C!N&/ case VK_SHIFT:
4OZ5hH
h MaskBits|=SHIFTBIT;
HZ<f( break;
%OTA5 default: //judge the key and send message
H0b6ZA%n break;
vV\F^ }
Q'Kik5I for(int index=0;index<MAX_KEY;index++){
7}tZ?vD if(hCallWnd[index]==NULL)
~eV!!38
J continue;
.m]=JC5' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6:@t=C {
fByh";<`P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/$Tl# bProcessed=TRUE;
5ih"Nds[H }
@+\S!o3m }
c<h!QnJ }
#u<oEDQ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ZYA.1VrM for(int index=0;index<MAX_KEY;index++){
\abAPo if(hCallWnd[index]==NULL)
?y*+^E0 continue;
KIAe36.~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
'=Kof1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
VkTlPmr //lParam的意义可看MSDN中WM_KEYDOWN部分
<`p75B }
u_6BHsU }
EB29vHAt~ }
6mF{ImbRbS return CallNextHookEx( hHook, nCode, wParam, lParam );
5e/qgI)M5 }
fr'huvc aO^:dl5 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
3?*M{Y| inPdV9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
)p!*c, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JwI`"$>w r}y[r}vk 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:
I>kiah* jI{~s]Q LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
gaw4NZd)0 {
DD@)z0W if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
U7]<U-.& {
Xb<DpBrk //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
0tW<LR-}E SaveBmp();
!O F?xW return FALSE;
yWv<A^C& }
0E?s>-b …… //其它处理及默认处理
joChML_ }
F%PwIB~cy ];pf Gq0]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。
{ywXz|TP 3qAwBVWa 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。
Q$|^~ Zp7yaz3y 二、编程步骤
N;Z`%& FpdDIa 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";
2/v35| ? ggm2%|?X 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
E7X!cm/2< poXLy/K 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;
ocIt@#20K 6%gB
E 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\]OySC%C$ p~Hvl3SxR 5、 添加代码,编译运行程序。
k]SAJ~bS| HY jMNj0 三、程序代码
^w:OS5 %R gEr4zae ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
2PVx++*]C #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
IPl@ DH #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
~lzdbX #if _MSC_VER > 1000
DR
k]{^C~ #pragma once
^Yj"RM$;N #endif // _MSC_VER > 1000
*2JH_Cj` #ifndef __AFXWIN_H__
tmO;:n<N #error include 'stdafx.h' before including this file for PCH
a'@-"qk #endif
UGhW0X3k #include "resource.h" // main symbols
xn(+G$m class CHookApp : public CWinApp
hq/J6 M {
jW-;4e*H=V public:
)Vwj9WD CHookApp();
JN9^fR09G // Overrides
1s#yWQ // ClassWizard generated virtual function overrides
1&"-*) //{{AFX_VIRTUAL(CHookApp)
B0f_kH~p~ public:
H4M{_2DO virtual BOOL InitInstance();
ET U-]R 3 virtual int ExitInstance();
%x&F4U //}}AFX_VIRTUAL
2HcsQ*H]G //{{AFX_MSG(CHookApp)
j((hqJr // NOTE - the ClassWizard will add and remove member functions here.
IE&_!ce // DO NOT EDIT what you see in these blocks of generated code !
Da"yZ\4 //}}AFX_MSG
-#hK|1] DECLARE_MESSAGE_MAP()
y^2#9\}K };
BjM+0[HC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>@^<S_KVh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
; ;<J
x. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$bk>kbl P BOOL InitHotkey();
b.QpHrnhtK BOOL UnInit();
I0!j<G #endif
m&Lt6_vi :`D'jF^S //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
lp(Nv(S #include "stdafx.h"
GGH;Z WSe #include "hook.h"
Ig<}dM.Z[ #include <windowsx.h>
o6*/o ]] #ifdef _DEBUG
aC`Li^ #define new DEBUG_NEW
~%`EeJwT #undef THIS_FILE
:3v9h^|+ static char THIS_FILE[] = __FILE__;
DB#$~(o #endif
!~WZ_z #define MAX_KEY 100
B$ui:R/ t #define CTRLBIT 0x04
/mc*Hc8R8 #define ALTBIT 0x02
cST\~SUm #define SHIFTBIT 0x01
oew|23Ytb #pragma data_seg("shareddata")
'GkvUrD9D$ HHOOK hHook =NULL;
/J;;|X#P UINT nHookCount =0;
L/BHexOB static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
L_^`k4ct static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
qYiv static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
=c&62;O static int KeyCount =0;
_
\l
HI static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0 sZwdO #pragma data_seg()
NEMEY7De2 HINSTANCE hins;
hcyn
void VerifyWindow();
G;NB\3~X BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
RK-x?ZYH' //{{AFX_MSG_MAP(CHookApp)
gwiR/(1 // NOTE - the ClassWizard will add and remove mapping macros here.
&3I$8v|!? // DO NOT EDIT what you see in these blocks of generated code!
QWw"K$l //}}AFX_MSG_MAP
vO]J]][ END_MESSAGE_MAP()
7%4.b7Q y:.?5KsPI CHookApp::CHookApp()
"qS!B.rt: {
ailG./I+ // TODO: add construction code here,
\n_3Bwd~ // Place all significant initialization in InitInstance
.Vmtx }
x6ahZ <7^Kt7k CHookApp theApp;
LJWTSf"f? LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
dQ<(lzS~ {
j7}lF?cJ2 BOOL bProcessed=FALSE;
zw]3Vg{T if(HC_ACTION==nCode)
p.C1 nh {
jn$j^51`C if((lParam&0xc0000000)==0xc0000000){// Key up
'00J~j~ switch(wParam)
r1G8]a gO {
zmb@*/fK case VK_MENU:
y\#o2PVmY MaskBits&=~ALTBIT;
1"O&40l break;
Vv7PCaq case VK_CONTROL:
@8zT'/$ MaskBits&=~CTRLBIT;
4gOgWBv break;
W`x)=y]Z case VK_SHIFT:
59i] MaskBits&=~SHIFTBIT;
YBvd
q1 break;
g\&2s, default: //judge the key and send message
ZoxS*Xk break;
@6b[GekZ< }
-NzTqLBn for(int index=0;index<MAX_KEY;index++){
\XS]N_}8> if(hCallWnd[index]==NULL)
6m+W#]^ continue;
&$#99\/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5
`=KyHi:b {
:B.G)M\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
zQc"bcif5( bProcessed=TRUE;
<KLg0L<W }
Gw{+xz KJ }
Cs4hgb| }
yW("G-Nm else if((lParam&0xc000ffff)==1){ //Key down
>vVw!.fJ switch(wParam)
8=F %+ {
E>}q2 case VK_MENU:
)6{P8k4Zr MaskBits|=ALTBIT;
t$ZkdF break;
{|6z+vR case VK_CONTROL:
?Y3@" rdR MaskBits|=CTRLBIT;
s;1e0n break;
E[?kGR[ case VK_SHIFT:
HO5d%85 MaskBits|=SHIFTBIT;
{mSJUK?TKl break;
M|r8KW~S) default: //judge the key and send message
Y<Q\d[3^F break;
M#a&\cqC }
5v9uHxy for(int index=0;index<MAX_KEY;index++)
Rla4L`X; {
C9jbv/c if(hCallWnd[index]==NULL)
-H\,2FO continue;
>nry0 ;z0, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J]fS({(\I {
GwQn;gkF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<&U!N'CE bProcessed=TRUE;
}-p,iTm }
O,mip }
T"!EK& }
Ei~f`{i if(!bProcessed){
$bGD%9
z for(int index=0;index<MAX_KEY;index++){
uvB1VV4 if(hCallWnd[index]==NULL)
2OalAY6RS continue;
D$nK`r if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]0/p 7N14 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%-j&e44 }
irMd
jG }
Oh`2tc- }
R0<< f] return CallNextHookEx( hHook, nCode, wParam, lParam );
3k'.(P|F }
wFL3&* G$5m$\K BOOL InitHotkey()
M !{'ED {
.mPg0 if(hHook!=NULL){
jvs[ / nHookCount++;
Dg2uE8k return TRUE;
}.{}A(^YR }
)^
<3\e else
%^.P~s6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
f=I:DkR if(hHook!=NULL)
$(q8y/,R*- nHookCount++;
ZnXejpj)D return (hHook!=NULL);
arh@`'Q }
(ZPXdr BOOL UnInit()
@vs@>CYdz {
7GZq|M_:y if(nHookCount>1){
;V.vfar nHookCount--;
bPd-D-R return TRUE;
2k1aX~? }
.ECHx Dp BOOL unhooked = UnhookWindowsHookEx(hHook);
_;e\:7<m if(unhooked==TRUE){
"=|t ~` nHookCount=0;
+Me2U9 hHook=NULL;
yFM>T\@ }
TzM=LvA return unhooked;
fk3kbdI }
t(?<#KUB- 59!)j>f BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.JAcPyK^ {
O&$0&dhc BOOL bAdded=FALSE;
a8s4T$ for(int index=0;index<MAX_KEY;index++){
P5URvEnz: if(hCallWnd[index]==0){
|}S1o0v{(a hCallWnd[index]=hWnd;
:vQM>9l7 HotKey[index]=cKey;
')o0O9/; HotKeyMask[index]=cMask;
$qm~c[x% bAdded=TRUE;
R&So4},B KeyCount++;
yJD>ny break;
NWKi
()nA% }
m m, lhIh }
Hj~O49%j& return bAdded;
ty-
r& }
Z?1OdoT- 3N<&u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;~/4d- {
5"=:#zN BOOL bRemoved=FALSE;
\ 4gXY$`@ for(int index=0;index<MAX_KEY;index++){
:p-Y7CSSu if(hCallWnd[index]==hWnd){
r95zP]T if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}O*WV 1 hCallWnd[index]=NULL;
4v qNule HotKey[index]=0;
0Q1/ n2V HotKeyMask[index]=0;
t)I0lnbs bRemoved=TRUE;
sv=H~wce KeyCount--;
p\S8oHWe break;
SE!L : }
4VFc|g }
( V4G<-jG }
kp`0erJqw return bRemoved;
t!jwY /T }
F<r4CHfh; H#+xKYrp void VerifyWindow()
u^=@DO' {
6V;:+"BkJ for(int i=0;i<MAX_KEY;i++){
N!m%~kS9k< if(hCallWnd
!=NULL){ ./.=Rw
if(!IsWindow(hCallWnd)){ RgGA$HN/
hCallWnd=NULL; Cef7+fa
HotKey=0; F^rl$#pCS
HotKeyMask=0; }n95< {
KeyCount--; @L;C_GEa
} $L&BT 0
} W5/};K\.
} M(5D'4.
} yW>R RE;
e\.HWV ]I
BOOL CHookApp::InitInstance() @?/\c:cp
{ a#QByP
AFX_MANAGE_STATE(AfxGetStaticModuleState()); `M rBav
hins=AfxGetInstanceHandle(); RbAt3k;y
InitHotkey(); 4Hd Si
return CWinApp::InitInstance(); {8:o?LnMW
} *w 21U!
mJ$Htyr
int CHookApp::ExitInstance() w `!LFHK
{ ;+/NjC1
VerifyWindow(); Omb.53+
UnInit(); ~04[KG
return CWinApp::ExitInstance(); 7TdQRB
} J@<!q
w,
7Cr
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kaO{#i2-
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gvo?([j-m
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i;]CL[#2e`
#if _MSC_VER > 1000 -yA3 RP
#pragma once r=0j7^B#
#endif // _MSC_VER > 1000 YkI9d&ib+
5Hy3\_ +
class CCaptureDlg : public CDialog -t>Z
9
{ zn^ v!:[
// Construction Gl;f#}
public: ^$}/|d(
BOOL bTray; j%5a+(H,z;
BOOL bRegistered; qp@m&GH
BOOL RegisterHotkey(); q_pmwJ:UL
UCHAR cKey; 9'X@@6b*'
UCHAR cMask; 6=3(oUl
void DeleteIcon(); QQq/5r4O`q
void AddIcon(); +9_ ,w bF
UINT nCount; p}BGw:=
void SaveBmp(); 7@@<5&mN
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ki4Xp'IK
// Dialog Data 9.]kOs_
//{{AFX_DATA(CCaptureDlg) Qpw@MF2P
enum { IDD = IDD_CAPTURE_DIALOG }; Pv[ykrm/
CComboBox m_Key; b?>VPuyBb
BOOL m_bControl; `Jqf**t
BOOL m_bAlt; ]7l{g9?ZtV
BOOL m_bShift; qzHU)Ns(_
CString m_Path; <k5`&X!+
CString m_Number; `OBl:e
//}}AFX_DATA cTy'JT7
// ClassWizard generated virtual function overrides qZP:@r"
//{{AFX_VIRTUAL(CCaptureDlg) +9jivOmK
public: yH+c#w
virtual BOOL PreTranslateMessage(MSG* pMsg); 1Df,a#,y"
protected: ,A?{~?u.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'rvE
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); St_Sl:m$
//}}AFX_VIRTUAL &rcdr+'
// Implementation U(!?d ]en
protected: ]An_5J
HICON m_hIcon; -FaaFw:Z;A
// Generated message map functions d#4 Wj0x
//{{AFX_MSG(CCaptureDlg) IBDVFA
virtual BOOL OnInitDialog(); ys/vI/e\
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *iYMX[$
afx_msg void OnPaint(); vv!Bo~L1,
afx_msg HCURSOR OnQueryDragIcon(); >gF-6nPQ
virtual void OnCancel(); yj'Cy8
afx_msg void OnAbout(); PQ i
}Evxa
afx_msg void OnBrowse(); j+ I*Xw
afx_msg void OnChange(); HMhLTl{;
//}}AFX_MSG k5q(7&C
DECLARE_MESSAGE_MAP() vWuyft*
}; +<z7ds{Z
#endif JOPTc]
G$|G w
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v,8Si'"i+
#include "stdafx.h" 4I
z.fAw
#include "Capture.h" {rz>^
#include "CaptureDlg.h" $G)&J2zL
#include <windowsx.h> [+_\z',u
#pragma comment(lib,"hook.lib") Nz}|%.GP"
#ifdef _DEBUG ?~{rf:Y
#define new DEBUG_NEW { qjUI
#undef THIS_FILE <Nvlk\LQ
static char THIS_FILE[] = __FILE__; a$A2IkD
#endif e5QOB/e&
#define IDM_SHELL WM_USER+1 7(H?k
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ybC-f'0
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); makaI0M
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %s]U@Ku(a
class CAboutDlg : public CDialog =7#u+*Yr9
{ LE<:.?<Z-
public:
hZ%2?v`
CAboutDlg(); /@6E3lhS
// Dialog Data fi5YMYd1
//{{AFX_DATA(CAboutDlg) >xklt"*U,
enum { IDD = IDD_ABOUTBOX }; | h
//}}AFX_DATA }#1UD
// ClassWizard generated virtual function overrides 0kkRK*fp}x
//{{AFX_VIRTUAL(CAboutDlg) 4fZY8
protected: "0!~g/X`rK
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F@B
//}}AFX_VIRTUAL P)a("XnJ`
// Implementation y?[5jL|Ue
protected: zuK/(qZ
//{{AFX_MSG(CAboutDlg) bX a %EMF
//}}AFX_MSG +oE7~64LL
DECLARE_MESSAGE_MAP() +ZY2a7uI
}; JHnk%h0
f+Pg1Q0zI
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4x=V|"
{ x8\E~6`,
//{{AFX_DATA_INIT(CAboutDlg) Xw&QrTDS`
//}}AFX_DATA_INIT ORUWslMt
} A@9U;8k
Bl>_&A)
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9:bh3@r/
{ |#Yu.c*
CDialog::DoDataExchange(pDX); c#]'#+aH
//{{AFX_DATA_MAP(CAboutDlg) E
geG,/-`
//}}AFX_DATA_MAP RTdD]pE8Q
} )^*9oqQ
o[5=S,'
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <~IH`
//{{AFX_MSG_MAP(CAboutDlg) W}#QKZ)MB
// No message handlers }qgqb
//}}AFX_MSG_MAP D#vn {^c8O
END_MESSAGE_MAP() '6Pu[^x
clPZd
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eONeWY9
: CDialog(CCaptureDlg::IDD, pParent) w>H%[\Qs
{ \NvC
//{{AFX_DATA_INIT(CCaptureDlg) P#vv+]/
m_bControl = FALSE; >/*?4
m_bAlt = FALSE; T U"K#V&u
m_bShift = FALSE; lOowMlf@2
m_Path = _T("c:\\"); HJ2]Nz:
m_Number = _T("0 picture captured."); 3iwoMrp
nCount=0; =jk-s*g
bRegistered=FALSE; nN_94
ZqS<
bTray=FALSE; (Fbm9(q$d
//}}AFX_DATA_INIT 9TbS>o
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E :'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); D@sx`H(
} IGF37';;
vV:MS O'r
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)
Rsa\V6N>
{ aPY>fy^8D
CDialog::DoDataExchange(pDX); s)o,Fi
//{{AFX_DATA_MAP(CCaptureDlg) M&}oat*
DDX_Control(pDX, IDC_KEY, m_Key); (>+k 3
DDX_Check(pDX, IDC_CONTROL, m_bControl); OI]K_ m3
DDX_Check(pDX, IDC_ALT, m_bAlt); &}L36|A:
DDX_Check(pDX, IDC_SHIFT, m_bShift); NbQMWU~7
DDX_Text(pDX, IDC_PATH, m_Path); &bS"N)je
DDX_Text(pDX, IDC_NUMBER, m_Number); <x>k3bD
//}}AFX_DATA_MAP uV/HNzC
} mvL0F%\.\
:xAe<Pq
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8 /RfNGY
//{{AFX_MSG_MAP(CCaptureDlg) Dbkuh!R
ON_WM_SYSCOMMAND() Z@c0(ol
ON_WM_PAINT() w ;s ]n
ON_WM_QUERYDRAGICON() 5.C[)`_
ON_BN_CLICKED(ID_ABOUT, OnAbout) 0]2B-o"kI
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _]?Dt%MkD
ON_BN_CLICKED(ID_CHANGE, OnChange) _A~~L6C
//}}AFX_MSG_MAP kj<D 4)
END_MESSAGE_MAP() NbdMec
!rsqr32]
BOOL CCaptureDlg::OnInitDialog() /F8\%l+
{ 4MF}FS2)
CDialog::OnInitDialog(); MLv.v&@S
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 13>3R+o
ASSERT(IDM_ABOUTBOX < 0xF000); u{{xnyl?
CMenu* pSysMenu = GetSystemMenu(FALSE); HA3SQ
if (pSysMenu != NULL) x4HMT/@AG2
{ Edn$0D68u_
CString strAboutMenu; }r<@o3t
strAboutMenu.LoadString(IDS_ABOUTBOX); M\.T 0M_
if (!strAboutMenu.IsEmpty()) m^oi4mV
{ lJ>QTZH!wW
pSysMenu->AppendMenu(MF_SEPARATOR); 7p>-oR"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); sh))[V"8
} d;jJe0pH
} D -+)M8bt
SetIcon(m_hIcon, TRUE); // Set big icon {+UNjKQC
SetIcon(m_hIcon, FALSE); // Set small icon IIt^e#s&
m_Key.SetCurSel(0); 1KIq$lG{ E
RegisterHotkey(); '*LN)E>d
CMenu* pMenu=GetSystemMenu(FALSE); <}Wy;!L
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6<Pg>Bg
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); l^eNZ3:H
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I.\f0I'.
return TRUE; // return TRUE unless you set the focus to a control #ZnX6=;X
} s3E~X
W.6JnYLQ&
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) a^}P_hg}-
{ oQjB&0k4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~:b:_ 5"
{ ^(m6g &$(
CAboutDlg dlgAbout; d
@kLLDP
dlgAbout.DoModal(); qL;T&h
} (7jB_ p%
else , ZP3F+XKb
{ U#]eN[
CDialog::OnSysCommand(nID, lParam);
ZYD88kQ
} zf;[nz
} _Il9s#NA%
s$\8)V52
void CCaptureDlg::OnPaint() L9YwOSb.
{ &'ETx"
if (IsIconic()) M^JZ]W(
{ W*DIW;8p
CPaintDC dc(this); // device context for painting GxDF7
z%&
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w{O3P"N2
// Center icon in client rectangle Z
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int cxIcon = GetSystemMetrics(SM_CXICON); MJ/%$
int cyIcon = GetSystemMetrics(SM_CYICON); K#sb"x`
CRect rect; N[bf.5T
GetClientRect(&rect); pr,1Wp0l
int x = (rect.Width() - cxIcon + 1) / 2; Oi[9b
int y = (rect.Height() - cyIcon + 1) / 2; @]"9EW
0
// Draw the icon -hR\Y2?
dc.DrawIcon(x, y, m_hIcon); &b6@_C9
} CU`Oc>;*T
else Tl7:}X<?
{ U+r#YE.
CDialog::OnPaint(); 6F&]Mk]V8
} /\$|D&e
} z*~PYAt
vrnj}f[h
HCURSOR CCaptureDlg::OnQueryDragIcon() %s :
{ }=m?gF%3
return (HCURSOR) m_hIcon; rJQ|Oi&1i
} V>uW|6
[,$mpJCI
void CCaptureDlg::OnCancel() j=QR*8*
{ '*;eFnmvs:
if(bTray) L?C~
qS2g
DeleteIcon(); [*ovYpj^
CDialog::OnCancel(); d?y\~<
} DSZhl-uGM
vfTG*jG
void CCaptureDlg::OnAbout() L\b_,'I
{ `[:1!I.}-
CAboutDlg dlg; UMW^0>Z!v
dlg.DoModal(); ;~$ $WU
} RW[<e
j?hyN@ns
void CCaptureDlg::OnBrowse() PxD}j
2Kd
{ 6U9Fa=%>}
CString str; xQ
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BROWSEINFO bi; 7{F9b0zwk
char name[MAX_PATH]; 9}$dwl(
ZeroMemory(&bi,sizeof(BROWSEINFO)); =d.W'q|
bi.hwndOwner=GetSafeHwnd(); }gRLW2&mR>
bi.pszDisplayName=name; ,;pX.Ob U
bi.lpszTitle="Select folder"; 3^yWpSC
bi.ulFlags=BIF_RETURNONLYFSDIRS; [y;ZbfMP|o
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Dx*oSP.qX
if(idl==NULL) ?ML<o>OKg
return; sl O9H6<
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8vo7~6yy
str.ReleaseBuffer(); d6
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m_Path=str; >Mw =}g@P
if(str.GetAt(str.GetLength()-1)!='\\') \JC(pn
m_Path+="\\"; Cy'W!qH
UpdateData(FALSE); `^k<.O
} p&doQh
h,?Yw+#o"
void CCaptureDlg::SaveBmp() IVODR
{ S9+gVR8]C
CDC dc; 3"D00~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8>;o MM
CBitmap bm; t1g%o5?;
int Width=GetSystemMetrics(SM_CXSCREEN); #N}}8RL
int Height=GetSystemMetrics(SM_CYSCREEN); \ jdO,-(
bm.CreateCompatibleBitmap(&dc,Width,Height); urjp&L&
CDC tdc; -3U}
(cZ*
tdc.CreateCompatibleDC(&dc); ?|yJ#j1=
CBitmap*pOld=tdc.SelectObject(&bm); oYx
f((x
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dh`A(B{hfc
tdc.SelectObject(pOld); i.,B
0s]Z
BITMAP btm; b?L43t ,
bm.GetBitmap(&btm); {z
~
'
DWORD size=btm.bmWidthBytes*btm.bmHeight; :8T@96]P
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); A1T;9`E
BITMAPINFOHEADER bih; Kx!|4ya,
bih.biBitCount=btm.bmBitsPixel; 5*Iz3vTq
bih.biClrImportant=0; tvCTC ey
bih.biClrUsed=0; 74wa
bih.biCompression=0; >g=:01z9
bih.biHeight=btm.bmHeight; CMUphS-KE
bih.biPlanes=1; o62gLO]z@
bih.biSize=sizeof(BITMAPINFOHEADER); #2,L)E\G8e
bih.biSizeImage=size; 13
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bih.biWidth=btm.bmWidth; f89<o#bm7h
bih.biXPelsPerMeter=0; G&Sg.<hn
bih.biYPelsPerMeter=0; ^S$w,
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?q`mr_x%?
static int filecount=0; Np_6ZUaqz
CString name; i/B"d,=<
name.Format("pict%04d.bmp",filecount++); wu'60po
name=m_Path+name; NYRNop( N#
BITMAPFILEHEADER bfh; =2'^:4Z
bfh.bfReserved1=bfh.bfReserved2=0; /m:}rD
bfh.bfType=((WORD)('M'<< 8)|'B'); '-{jn+,
bfh.bfSize=54+size; qpCi61lTDJ
bfh.bfOffBits=54; [r'M_foga*
CFile bf; "WL
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L}nc'smvM
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $E6uA}s
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VtFh1FDI\
bf.WriteHuge(lpData,size); vkLG<Y
bf.Close(); af{K4:I
nCount++; E"!*ASN
} ,B><la87
GlobalFreePtr(lpData); Uy=eHwU?J
if(nCount==1) v-qS 'N4
m_Number.Format("%d picture captured.",nCount); Zx0c6d!B
else @"0qS:s]X
m_Number.Format("%d pictures captured.",nCount); C: cu1Y9
UpdateData(FALSE); CJ b~~
} [g_@<?zg
iV=#'yY
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) uOx$@1v,
{ Qfi5fp=f
if(pMsg -> message == WM_KEYDOWN) !bg3
{ 4g9VE;Gd
if(pMsg -> wParam == VK_ESCAPE) ufOaD7
return TRUE; )Ec;kr b+
if(pMsg -> wParam == VK_RETURN) ?a}~yz#B(
return TRUE; w,7
GC5j\
} &0`L; 1R
return CDialog::PreTranslateMessage(pMsg); _{aVm&^kA
} +TX]~k79Oq
MDpXth7
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )
AIZE?oX
{ V
RL6F2 >6
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #S5vX<"9
SaveBmp(); W~4|Z=f
return FALSE; 5P4>xv[
} w_ m
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ FoLwS%+yO
CMenu pop; ZO~N|s6B^
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E =E
CMenu*pMenu=pop.GetSubMenu(0); 9}-,dgAB
pMenu->SetDefaultItem(ID_EXITICON); j:#[voo7
CPoint pt; Onl:eG;@
GetCursorPos(&pt); wJ}8y4O!N
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~kL":C>2
if(id==ID_EXITICON) LQe<mZ<
DeleteIcon(); PHoW|K_e
else if(id==ID_EXIT) 9Y(<W_{/
OnCancel(); %$08*bAtB7
return FALSE; & 3gni4@@
} rRMC<.=
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,SBL~JJ
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) C5m*pGImG
AddIcon(); ,[x'S>N
return res; CA3.fu3(p
} c{[d@jtO
iL(E`_I<
void CCaptureDlg::AddIcon() p|Ln;aYc
{ 82$^pg>
NOTIFYICONDATA data; w/R^Vwq
data.cbSize=sizeof(NOTIFYICONDATA); FKaY w
CString tip; A;kB"Tx
tip.LoadString(IDS_ICONTIP); {W-PYHZ;
data.hIcon=GetIcon(0); OAv/P|n=
data.hWnd=GetSafeHwnd(); g\ke,r6
strcpy(data.szTip,tip); 0Y\u,\GrxW
data.uCallbackMessage=IDM_SHELL; =zsXa=<
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <1"6`24
data.uID=98; Yz,*Q<t
Shell_NotifyIcon(NIM_ADD,&data); HLS^Ga,(
ShowWindow(SW_HIDE); /HLQ
bTray=TRUE; .EI/0"^
} @sVBG']p
ALFw[1X
void CCaptureDlg::DeleteIcon() N@k:kI
{ S"lcePN
NOTIFYICONDATA data; U_w)*)F
data.cbSize=sizeof(NOTIFYICONDATA); Q
(`IiV
data.hWnd=GetSafeHwnd(); ct/I85c@P
data.uID=98; k|w6&k3
Shell_NotifyIcon(NIM_DELETE,&data); <{'':/tXI
ShowWindow(SW_SHOW); bO-8<IjC_3
SetForegroundWindow(); /6>2,S8Ar
ShowWindow(SW_SHOWNORMAL); t]Vw`z%G
bTray=FALSE; R(csJ4F
} nwz}&nR
-2f0CAh~
void CCaptureDlg::OnChange() 4pF%G
{ Wc(?ezn
RegisterHotkey(); $?0<rvGJ
} %!WQ;(
*@n%K,$v
BOOL CCaptureDlg::RegisterHotkey() ]Qj65]
{ K5!k06;s
UpdateData(); M[N|HsI8?
UCHAR mask=0; 64[j:t=N
UCHAR key=0; X^"95Ic
if(m_bControl) BHa!jw_~o
mask|=4; j'~xe3j
if(m_bAlt) @UD6qA
mask|=2; )5bhyzSZI
if(m_bShift) ([s2F%S`@
mask|=1; ?"J5~_U.
key=Key_Table[m_Key.GetCurSel()]; ,~c:P>v=
if(bRegistered){ ?9/%K45
DeleteHotkey(GetSafeHwnd(),cKey,cMask); b>G!K)MS3
bRegistered=FALSE; aMT&}3
} <` HLG2
cMask=mask; &EZ28k"x
cKey=key; /SSl$
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XYf;72*
return bRegistered; 2g|+*.*`
} RfFeAg,]/
~u7a50
四、小结 c!E+&5|n
!%sj- RMvG
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。