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:
:0|]cHm
)8VrGg? 一、实现方法
_TfG-Ae |=L~>G 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:
^2%_AP0= F$QN>wPpM #pragma data_seg("shareddata")
92!1I$zi HHOOK hHook =NULL; //钩子句柄
Wjc1 EW!2x UINT nHookCount =0; //挂接的程序数目
bRT1~) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{XH!`\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@8E mY,{; static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
=Ryh@X& static int KeyCount =0;
M]4qS('[ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
,r~pf(nz #pragma data_seg()
`T7gfb%1-3 4Xi
_[
Xf 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。
S+Z_Qf GEj/Z};;[b 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:
(jd)sf6Tj[ by!1L1[JTt BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1"?3l`i cKey,UCHAR cMask)
Sm(X/P=z {
&6<>hqR^ BOOL bAdded=FALSE;
1)yEx1 for(int index=0;index<MAX_KEY;index++){
4XpW#> if(hCallWnd[index]==0){
:tU&d(8 hCallWnd[index]=hWnd;
-9TNU7^ HotKey[index]=cKey;
aNLRUdc. HotKeyMask[index]=cMask;
H_RV#BW& bAdded=TRUE;
c<- F_+[ KeyCount++;
11t+
a,fM break;
@yiAi:v@ }
Z^ynw8k" }
Qz)1wf'y return bAdded;
Z BjyQ4h }
9eO!_a^ //删除热键
UJ0fYTeuI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Afa|6zZ> {
2L"$p? BOOL bRemoved=FALSE;
dz@L}b* for(int index=0;index<MAX_KEY;index++){
jo-jPYH T if(hCallWnd[index]==hWnd){
#^%HJp^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$I*ye+a*{q hCallWnd[index]=NULL;
:cU6W2EV HotKey[index]=0;
aVkgE> HotKeyMask[index]=0;
[&12`!;j bRemoved=TRUE;
l2H-E&'= KeyCount--;
C".nB12 break;
hM$K?t }
gS{hfDpk,h }
%N+8K }
/$
Gp<.z return bRemoved;
zURxXo/\V }
cV^r_E\m 6[ }~m\cY Nfe DLL中的钩子函数如下:
v"wxHro &j=FxF9o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
n7-|\p!xP6 {
YZ>L\ BOOL bProcessed=FALSE;
jZwv!-: if(HC_ACTION==nCode)
/g$cQ=c {
OBrbWXp@ if((lParam&0xc0000000)==0xc0000000){// 有键松开
KFQ 4vavNh switch(wParam)
%]NaHf {
6{Y3-Pxg case VK_MENU:
<ua` WRQr MaskBits&=~ALTBIT;
@CGci lS= break;
yQ$Q{,S9 case VK_CONTROL:
X*f#S:kiNU MaskBits&=~CTRLBIT;
C>l{_J)n break;
' cM2]< case VK_SHIFT:
me-Tv7WL MaskBits&=~SHIFTBIT;
.Uk ejx break;
|e{F;8 default: //judge the key and send message
3"v
k$ break;
\"r84@< }
bu[PQsT for(int index=0;index<MAX_KEY;index++){
y[QQopy4: if(hCallWnd[index]==NULL)
2J7=
O^$? continue;
f3 _-{<FZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[I6(;lq2 {
~)J]`el,Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
BpL7s
ej7 bProcessed=TRUE;
|#_IAN }
Tfasry9'8 }
)v\zaz }
M"XILNV-~ else if((lParam&0xc000ffff)==1){ //有键按下
DJ&ni` switch(wParam)
9Q\CJ9 {
4wLN#dpeEy case VK_MENU:
UqVcN$^b MaskBits|=ALTBIT;
GM]" $ break;
q{4W@Um- case VK_CONTROL:
BY*{j&^ MaskBits|=CTRLBIT;
^(}D break;
bcx,Kb case VK_SHIFT:
ZiR },F/ MaskBits|=SHIFTBIT;
z=\y)'b break;
&8=wkG% default: //judge the key and send message
JSXJlau break;
%@C(H%obWd }
I^}q;L![\ for(int index=0;index<MAX_KEY;index++){
++>HU{ if(hCallWnd[index]==NULL)
9)c{L<o}T continue;
j:|um&`) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
d7,ZpHt {
Hlh`d N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
[D;wB|+, bProcessed=TRUE;
n8h1SlK08 }
j ?c"BF. }
kSL7WQe?j }
%E<.\\^% if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
U%.%:'eV= for(int index=0;index<MAX_KEY;index++){
oe (})M if(hCallWnd[index]==NULL)
4KbOyTQ continue;
Rgstk/1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
TRLz>m Q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-4 *94< //lParam的意义可看MSDN中WM_KEYDOWN部分
6YErF| }
11"- taWj }
V(gmC%6%l* }
qu8!fFQjYL return CallNextHookEx( hHook, nCode, wParam, lParam );
R_DstpsT }
9F~e^v]zp 0iKSUwps 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:
"+0Yhr ? ,Yp+&&p. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
8m prK`p BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
vJ
+sdG c+BD37S 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:
L3N?^^] ^l,(~03_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
VL =1 9[ {
3t4i2] if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
EWb'#+BP {
k<&zVV' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
xYmh{Vc8 SaveBmp();
dmR>u return FALSE;
%w$\v"^_Y }
D,3Kx ^ …… //其它处理及默认处理
FRBW(vKE }
v|K, :D|5E>o( W?>C$_p C 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。
[TW?sW^0 v[7iWBqJ 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。
s'7PHP)LOJ ?IN'Dc9&%- 二、编程步骤
24g\xNnt &b__/o 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|f
=hlY QLPb5{>KDS 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
_YK66cS3E/ ~vb yX 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;
C{*' p+f {+3
`{34e 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;
h]+UK14m u# TNW. 5、 添加代码,编译运行程序。
'9ki~jtf= -$ VP#% 三、程序代码
CD!Aa [
pe{,lp ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
7^oO
N+=d #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
|#b]e|aP #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5V $H?MW> #if _MSC_VER > 1000
mi';96 #pragma once
LJ8 t@ui #endif // _MSC_VER > 1000
>fq]c #ifndef __AFXWIN_H__
sQ}E4Iq1#S #error include 'stdafx.h' before including this file for PCH
;_K3/: #endif
G (3wI} #include "resource.h" // main symbols
)K}-z+$)k class CHookApp : public CWinApp
JhU"akoK {
ufF>I public:
i8h^~d2" CHookApp();
[yhK4A // Overrides
1PN!1= F} // ClassWizard generated virtual function overrides
3|0wD:Dy //{{AFX_VIRTUAL(CHookApp)
@zCp/fo3 public:
d :vuRK4+ virtual BOOL InitInstance();
u\AL`'v virtual int ExitInstance();
7WMF8(j5 //}}AFX_VIRTUAL
Oxp!G7qfo //{{AFX_MSG(CHookApp)
"-
?uB Mz // NOTE - the ClassWizard will add and remove member functions here.
n1Wo<$# // DO NOT EDIT what you see in these blocks of generated code !
sd5)We //}}AFX_MSG
+^ cjdH* DECLARE_MESSAGE_MAP()
j[RY };
h(/& ;\Cr LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
^$AJV%3wI BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%TeH#%[g>\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&v/>P1Z
G BOOL InitHotkey();
KU=+ 1,Jf BOOL UnInit();
9_b_O T #endif
iAr]Ed"9| yno X=#` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
xxQgX~'x #include "stdafx.h"
V<i_YLYmJe #include "hook.h"
<~Oy3#{ #include <windowsx.h>
|
9 <+!t\ #ifdef _DEBUG
1KadT7<0} #define new DEBUG_NEW
@$|8zPs #undef THIS_FILE
"(YfvO+ static char THIS_FILE[] = __FILE__;
M{jJ>S{g #endif
4M)oA|1w #define MAX_KEY 100
7PW7&]-WQ #define CTRLBIT 0x04
Pr_DMu #define ALTBIT 0x02
v&)G~cz #define SHIFTBIT 0x01
0aqq*e'c #pragma data_seg("shareddata")
+Ym#!" HHOOK hHook =NULL;
E*vh<C UINT nHookCount =0;
|%g)H,6c static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
]p@q.P static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)B9 /P>c static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^
A J_
static int KeyCount =0;
+7mUX static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ELZ@0, #pragma data_seg()
vhGX& HINSTANCE hins;
UZ;FrQ(l{ void VerifyWindow();
=lmelo#m& BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
tPb<*{eG //{{AFX_MSG_MAP(CHookApp)
%w;wQ_ // NOTE - the ClassWizard will add and remove mapping macros here.
j%)@f0Ng // DO NOT EDIT what you see in these blocks of generated code!
iLO,XW?d
v //}}AFX_MSG_MAP
o&)v{q END_MESSAGE_MAP()
Od+nBJ
jpkKdQX) CHookApp::CHookApp()
8
+mW {
&e3pmHp' // TODO: add construction code here,
(,R\6 // Place all significant initialization in InitInstance
A\})H }
7?ILmYBw F*JbTEOn CHookApp theApp;
jGUegeq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
u)[i'ceQZ: {
+O4//FC-" BOOL bProcessed=FALSE;
zmhAeblA if(HC_ACTION==nCode)
w$0*5n>) {
[
e#[j{ if((lParam&0xc0000000)==0xc0000000){// Key up
6t{G{ ] switch(wParam)
4xF}rm {
zgl$ n case VK_MENU:
s_P[lbHt. MaskBits&=~ALTBIT;
*>k6n5% break;
ui80}% case VK_CONTROL:
JYnyo$m/ MaskBits&=~CTRLBIT;
Gce[RB: break;
-XfGF<}r case VK_SHIFT:
F8xu&Vk0: MaskBits&=~SHIFTBIT;
0E7h+]bh| break;
a5/r|BiBK default: //judge the key and send message
r2\}_pIj break;
Z~ K} @ }
EY@KWs3"H for(int index=0;index<MAX_KEY;index++){
2S//5@~_m if(hCallWnd[index]==NULL)
sWKv>bx continue;
Xdh@ ^` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;;N#'.xD {
+4F; m_G6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
_^D -nk? bProcessed=TRUE;
rX22%~1 }
y]g5S-G }
`('NH]^ }
g,B@*2Uj else if((lParam&0xc000ffff)==1){ //Key down
} x
KvN switch(wParam)
em2Tet {
SC--jhDZ case VK_MENU:
>#y1(\e MaskBits|=ALTBIT;
W~5gTiBZ] break;
;?Q0mXr case VK_CONTROL:
f\z9?Z(~ MaskBits|=CTRLBIT;
v}=pxWhm break;
S[CWrPaDQ case VK_SHIFT:
>:OP+Vc MaskBits|=SHIFTBIT;
AMN`bgxW break;
P]7s1kgaS default: //judge the key and send message
ZU`HaL$ break;
I7C+XUQkQ }
9hgIQl for(int index=0;index<MAX_KEY;index++)
1[-RIN;U8 {
f[q_eY if(hCallWnd[index]==NULL)
gX(8V*os^ continue;
x[R?hS,0t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?4t~z 1.f {
MfraTUxIo/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
212 =+k bProcessed=TRUE;
]UrlFiR }
GS*_m4.Ry6 }
G+WCE* }
/U>8vV+C if(!bProcessed){
t&-c?&FO\; for(int index=0;index<MAX_KEY;index++){
fO837 if(hCallWnd[index]==NULL)
z=4E#y`?U continue;
ie/QSte if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
N@"e^i SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{JM3drnw }
`F~Fb S }
)O\l3h" }
+B7UGI return CallNextHookEx( hHook, nCode, wParam, lParam );
7o-}86x# }
UJ`%uLR~ 9Dyw4'W.N BOOL InitHotkey()
NM1TFs2Y* {
R(2MI}T if(hHook!=NULL){
T{
lm
z<g nHookCount++;
^.M_1$- return TRUE;
lEpPi@2PK }
17VNw/Y else
0.#%KfQ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
G~NhBA9 if(hHook!=NULL)
Xg;q\GS/<i nHookCount++;
&WdP=E" return (hHook!=NULL);
II.Wa&w} }
{9hhfI#3_ BOOL UnInit()
VKi3z%kwK {
&<hk&B if(nHookCount>1){
!)c0 nHookCount--;
|\]pTA$2 return TRUE;
`U;V- }
ik0w\* BOOL unhooked = UnhookWindowsHookEx(hHook);
2Mu(GUe; if(unhooked==TRUE){
eoPoGC nHookCount=0;
vf`] hHook=NULL;
QEEX|WM }
=OR&,xt return unhooked;
x_EU.924uY }
^Cg@'R9 NmN:x&/ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,->
P+m5 {
&HJ~\6r\ BOOL bAdded=FALSE;
Z8pZm`g)T for(int index=0;index<MAX_KEY;index++){
u[!Ex=9W if(hCallWnd[index]==0){
=PoPp hCallWnd[index]=hWnd;
qche7kg!a HotKey[index]=cKey;
tI2p-d9B HotKeyMask[index]=cMask;
Pv@;)s(- bAdded=TRUE;
*8 ] KeyCount++;
U9AtC.IG! break;
CjA}-ee }
+Jc-9Ko\c; }
'`p0T%w return bAdded;
vaZ?>94 }
F#{PJ# U3w*z6OG BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
r3.v ^ {
wD[qE BOOL bRemoved=FALSE;
hpticW| for(int index=0;index<MAX_KEY;index++){
>2)!w if(hCallWnd[index]==hWnd){
zyI4E\ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
x[%% )[d hCallWnd[index]=NULL;
=`%%* HotKey[index]=0;
{XYf"ONi HotKeyMask[index]=0;
$Vm J[EF1 bRemoved=TRUE;
3K_!:[ KeyCount--;
J~G"D-l<9/ break;
+z\O"zlj }
.]Z,O>N }
{c$%3iQq }
B Zw#ACU return bRemoved;
_d<\@Tkw }
#60<$HO:Z u"a$/ void VerifyWindow()
;D<rGkry {
,<-a 6 for(int i=0;i<MAX_KEY;i++){
&nZ.$UK< if(hCallWnd
!=NULL){ j8p'B-yS
if(!IsWindow(hCallWnd)){ ?r~](l
hCallWnd=NULL; ]9pcDZB
HotKey=0; k4nA+k<WI`
HotKeyMask=0; #kGxX@0
KeyCount--; kC[nY
} |zL .PS
} Xq%!(YD|
} KBGJB`D*
} uO-R:MC
/h%MWCZWm^
BOOL CHookApp::InitInstance() oDas~0<oh
{ 8%#uZG\}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); BF6H_g
hins=AfxGetInstanceHandle(); Jh:-<xy)
InitHotkey(); 3'2}F%!Mv
return CWinApp::InitInstance();
oApI/o
} l@YpgyqaL
#$%gs]
int CHookApp::ExitInstance() Wkv**X}
{ Afa{f}st
VerifyWindow(); J XnPKAN
UnInit(); c5rQkDW
return CWinApp::ExitInstance(); PZl(S}VY
} =U".L
]QU52R@M
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Cj):g,[a
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zR3Z(^]v
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _mL 9G5~r
#if _MSC_VER > 1000 PX'I:B]x*
#pragma once (jYs_8;
#endif // _MSC_VER > 1000 ^ihXM]1{G
+=@Z5eu
class CCaptureDlg : public CDialog `ionMTZY
{ ?-'Q-\j
// Construction tg5jS]O
public: \>/:@4oK
BOOL bTray; V2]S{!p}k
BOOL bRegistered; A1f]HT
BOOL RegisterHotkey(); +CNRSq"
UCHAR cKey; I.e'
UCHAR cMask; a^5`fA/L,
void DeleteIcon(); c\4n 7m,y
void AddIcon(); iVu+ct-iv
UINT nCount; z?"5="D
void SaveBmp(); JT^E`<nn
CCaptureDlg(CWnd* pParent = NULL); // standard constructor c)E[K-u
// Dialog Data I}v'n{5(
//{{AFX_DATA(CCaptureDlg) j)IK
enum { IDD = IDD_CAPTURE_DIALOG }; n7q-)Dv_U
CComboBox m_Key; ?3z+|;t6C
BOOL m_bControl; 3]Lk}0atpL
BOOL m_bAlt; A1ebXXD)
BOOL m_bShift; \a]\jZb
CString m_Path; D+o.9I/{
CString m_Number; O\KAvoQ%s
//}}AFX_DATA c)6Y.[).
// ClassWizard generated virtual function overrides {Rj' =%h
//{{AFX_VIRTUAL(CCaptureDlg) _@prv7e
public: o>`/,-!
virtual BOOL PreTranslateMessage(MSG* pMsg); Sc~kO4
protected: sqZHk+<%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A# M
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q=1SP@;\6
//}}AFX_VIRTUAL e<^4F%jSK
// Implementation kyo ,yD
protected: V!U[N.&$
HICON m_hIcon; lIFU7g
// Generated message map functions A^p $~e\)
//{{AFX_MSG(CCaptureDlg) wD,F=O
virtual BOOL OnInitDialog(); WNYLQ=;
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }C&c=3V
afx_msg void OnPaint(); (kuZS4Af
afx_msg HCURSOR OnQueryDragIcon(); My`%gP~%g
virtual void OnCancel(); P/PS(`
afx_msg void OnAbout(); ^&rbI,D
afx_msg void OnBrowse(); z:G9Uu3H(
afx_msg void OnChange(); 0\~Zg
//}}AFX_MSG -5ec8m8
DECLARE_MESSAGE_MAP() Y)
t}%62
}; .CpF0
#endif 7:j #1N[p
`(a^=e5
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oV!9B -<
#include "stdafx.h" 5~"=Fm<uD
#include "Capture.h" zm .2L
#include "CaptureDlg.h" 86I*
#include <windowsx.h> Hf-F-~E
#pragma comment(lib,"hook.lib") %ej"ZeM
#ifdef _DEBUG `WW0~Tp3
#define new DEBUG_NEW }I`|*6Up
#undef THIS_FILE 8say"Qz
static char THIS_FILE[] = __FILE__; Q8~pIv
#endif q%vUEQLBp
#define IDM_SHELL WM_USER+1 N+V-V-PVk
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,/ : )FV
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t3XMQ']
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; zLn#p]
class CAboutDlg : public CDialog nz',Zm},
{ sq^"bLw
public: *sG<w%%
CAboutDlg(); -/qrEKQ0U?
// Dialog Data FTenXJ/c
//{{AFX_DATA(CAboutDlg) dCK-"#T!
enum { IDD = IDD_ABOUTBOX }; HY:@=%R
//}}AFX_DATA |#B"j1D,H
// ClassWizard generated virtual function overrides T:&+#0<
//{{AFX_VIRTUAL(CAboutDlg) N.`]D)57
protected: @&W?e?O ~G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C(P$,;6
//}}AFX_VIRTUAL nJya1AH;
// Implementation Z7/dRc
protected: {L eEnh-
//{{AFX_MSG(CAboutDlg)
k
WtUj
//}}AFX_MSG >dl!Ep
DECLARE_MESSAGE_MAP() bcs!4
}; ~z}au"k
!T{g& f
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z%R%D*f@y
{ e`rY]X
//{{AFX_DATA_INIT(CAboutDlg) RVsN r
rZ
//}}AFX_DATA_INIT M Sj0D2H
} PS22$_}
("oA{:@d
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0R]CI
{ bsry([N>w
CDialog::DoDataExchange(pDX); XL3h ;$,
//{{AFX_DATA_MAP(CAboutDlg) z&0V21"l
//}}AFX_DATA_MAP f.$o|R=v
} z)~!G~J]
+;Gl>$
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~e+w@ lK
//{{AFX_MSG_MAP(CAboutDlg) Q=8
cBRe
// No message handlers u3:Q t2^S
//}}AFX_MSG_MAP ,')bO*Ng
END_MESSAGE_MAP() -!cAr
<
&3f.78a
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jQ)>XOok
: CDialog(CCaptureDlg::IDD, pParent) 9%qMZP0]
{ Mg$9'a"[\
//{{AFX_DATA_INIT(CCaptureDlg) >i%w'uU
m_bControl = FALSE; t>2^!vl
m_bAlt = FALSE; +CT$/k
m_bShift = FALSE; eNFUjDm
m_Path = _T("c:\\"); ODEXQl}R
m_Number = _T("0 picture captured."); wjJ1Psnx
nCount=0; '5U$`Xe1
bRegistered=FALSE; 2&fwr>!$
bTray=FALSE; m4wTg
8LJ
//}}AFX_DATA_INIT ["<(\v9P)
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jTr4A-"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h$k3MhYDes
} '>Y
2lqa
=7Vl{>*1N
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) He!!oKK>
{ v`BG1&/|
CDialog::DoDataExchange(pDX); cvA\C_
//{{AFX_DATA_MAP(CCaptureDlg) WN#lfn8 7
DDX_Control(pDX, IDC_KEY, m_Key); \2xBOe-a]
DDX_Check(pDX, IDC_CONTROL, m_bControl); J\'5CG
DDX_Check(pDX, IDC_ALT, m_bAlt); rb'Gve W[
DDX_Check(pDX, IDC_SHIFT, m_bShift); jSYg\Z5!
DDX_Text(pDX, IDC_PATH, m_Path); Ib8i#D V
DDX_Text(pDX, IDC_NUMBER, m_Number); R
TUNha^<T
//}}AFX_DATA_MAP b
H_pNx81
} X);Zm7
&;U7/?Q
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &2=KQ\HO
//{{AFX_MSG_MAP(CCaptureDlg) d %W}w.
ON_WM_SYSCOMMAND() @a\SR'8
ON_WM_PAINT() vCSB8R
ON_WM_QUERYDRAGICON() FT>~ES]cQd
ON_BN_CLICKED(ID_ABOUT, OnAbout) aX)./
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) JvL'gJ$70
ON_BN_CLICKED(ID_CHANGE, OnChange) )K>@$6H+2
//}}AFX_MSG_MAP q{/Jw"e
END_MESSAGE_MAP() 5Y=\~,%\oH
t=rAcyNM
BOOL CCaptureDlg::OnInitDialog() U/!&KsnT
{ %*c|[7Z~V
CDialog::OnInitDialog(); (iOCzZ6S
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /^3oq]
ASSERT(IDM_ABOUTBOX < 0xF000); kO_XyC4(
CMenu* pSysMenu = GetSystemMenu(FALSE); N"RYM~c7
if (pSysMenu != NULL) K]!u@I* K"
{ ;nKHm
CString strAboutMenu; B8AzN9v&"N
strAboutMenu.LoadString(IDS_ABOUTBOX); SM+fG: 4d
if (!strAboutMenu.IsEmpty()) kdh9ftm*\
{ Df~p'N-$
pSysMenu->AppendMenu(MF_SEPARATOR); (Q8?)
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |p -R9A*>h
} OsL%SKs|
} Vnj/>e3
SetIcon(m_hIcon, TRUE); // Set big icon `uZv9I"
SetIcon(m_hIcon, FALSE); // Set small icon BDkBYhz;7
m_Key.SetCurSel(0); #7-@k-<|
RegisterHotkey(); ^Lmc%y
CMenu* pMenu=GetSystemMenu(FALSE); C'czXZtn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nQ17E{^pR
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :LiDJF
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z3So|M{v
return TRUE; // return TRUE unless you set the focus to a control xY'qm8V
} CEuk1$
(F[/~~
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) } .3]
{ Wt9iL
if ((nID & 0xFFF0) == IDM_ABOUTBOX) U+PCvl=x
{ Cz@FZb8
CAboutDlg dlgAbout; TDFO9%2c
dlgAbout.DoModal(); ^b!7R
<>~
} mH*@d"
else $7n#\h
{ iSr`fQw#
CDialog::OnSysCommand(nID, lParam); Ivt} o_b*
} L>Oy7w)Y
} afF+*\xXN
)@bH"
void CCaptureDlg::OnPaint() +#qt^NO
{ Bf:tal6 -M
if (IsIconic()) i<wU.JX&h
{ 5Z6-R}uXk
CPaintDC dc(this); // device context for painting MkW1FjdP
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,+/9K)X
// Center icon in client rectangle [Ba2b: l6v
int cxIcon = GetSystemMetrics(SM_CXICON); W`u$7k]$
int cyIcon = GetSystemMetrics(SM_CYICON); =Etwa
CRect rect; _TOi
[GT
GetClientRect(&rect); y,v0-o~q
int x = (rect.Width() - cxIcon + 1) / 2; <L/M`(:=k
int y = (rect.Height() - cyIcon + 1) / 2; XK%W^a*x
// Draw the icon }or2 $\>m
dc.DrawIcon(x, y, m_hIcon); e-iYJ?
} ,V33v<|wc
else J7ktfyQ0W
{ `xX4!^0Hm
CDialog::OnPaint(); Xvu)
} 3aO;@GNJ
} $35,\ZO>
VXkAFgO
HCURSOR CCaptureDlg::OnQueryDragIcon() mC:X4l]5
{ A3"1D
return (HCURSOR) m_hIcon; umm \r&]A
} *"ykTqa
kQwm"Z
void CCaptureDlg::OnCancel() +2EHmuJ;
{ y)p$_.YFF
if(bTray) EItxRHV5
DeleteIcon(); 4ypRyO
CDialog::OnCancel(); Kunle~Ro
} E5*-;>2c
3V/_I<y
void CCaptureDlg::OnAbout() xHv|ca.E
{ x[PEn
CAboutDlg dlg; q8?=*1g
dlg.DoModal(); Ehb?CnV#J
} 9V=<| 2
8>Du
void CCaptureDlg::OnBrowse() d<^_w!4X}
{ [_
M6/
CString str; Lf^5Eo/
5A
BROWSEINFO bi; (Bt;DM#>
char name[MAX_PATH]; .'5'0lR5
ZeroMemory(&bi,sizeof(BROWSEINFO)); 8Wdkztp/S
bi.hwndOwner=GetSafeHwnd(); Ii~; d3.
bi.pszDisplayName=name; 0{0;1.ZP
bi.lpszTitle="Select folder"; PyC;f8n'(
bi.ulFlags=BIF_RETURNONLYFSDIRS; ;48P vw>g}
LPITEMIDLIST idl=SHBrowseForFolder(&bi); @[d#mz
if(idl==NULL) M8^.19q;
return; b&=]S(
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7.Ml9{M/i
str.ReleaseBuffer(); <`c25ih.4
m_Path=str; v9E+(4I9_
if(str.GetAt(str.GetLength()-1)!='\\') &<gUFcw7Ui
m_Path+="\\"; 7szls71/=
UpdateData(FALSE); rDIhpT)a
} K08 iPIkQ
Cq?',QU6j
void CCaptureDlg::SaveBmp() _YH<YOrMh
{ #0P!xZ'|{
CDC dc; 2f3=?YqD
dc.CreateDC("DISPLAY",NULL,NULL,NULL); N@cMM1
CBitmap bm; 5mI?pfm
int Width=GetSystemMetrics(SM_CXSCREEN); 6Cl+KcJH
int Height=GetSystemMetrics(SM_CYSCREEN); v]WH8GI
bm.CreateCompatibleBitmap(&dc,Width,Height); 9U2Px$E
CDC tdc;
Z $!C=
tdc.CreateCompatibleDC(&dc); @+?+6sS
CBitmap*pOld=tdc.SelectObject(&bm); AA))KBXq
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >vQ6V'F
tdc.SelectObject(pOld); _&W0e} 4
BITMAP btm; $42Au2Jg
bm.GetBitmap(&btm); ,dHP`j ?
DWORD size=btm.bmWidthBytes*btm.bmHeight; 968Ac}OA
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lir&e
9I+
BITMAPINFOHEADER bih; D3%l4.h
bih.biBitCount=btm.bmBitsPixel; T@(6hEmP,
bih.biClrImportant=0; LKqRvPnh
bih.biClrUsed=0; cJP'ShnCh
bih.biCompression=0; xik`W!1S
bih.biHeight=btm.bmHeight; <9@&oN+T
bih.biPlanes=1; "0|BoG
bih.biSize=sizeof(BITMAPINFOHEADER); m9#}X_&x
bih.biSizeImage=size; X,>(Y8
bih.biWidth=btm.bmWidth; 3%XG@OgP
bih.biXPelsPerMeter=0; ^pJ0nY#c
bih.biYPelsPerMeter=0; {B@*DQv
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .=Pm>o/,
static int filecount=0; UUl*f!&
o
CString name; jEZ
"
name.Format("pict%04d.bmp",filecount++); {hxW,mmA
name=m_Path+name; M} O[`Fx{W
BITMAPFILEHEADER bfh; s,84*6u
bfh.bfReserved1=bfh.bfReserved2=0; 4$%`Qh>yA
bfh.bfType=((WORD)('M'<< 8)|'B'); 65lOX$*{-
bfh.bfSize=54+size; Jf_]Z
bfh.bfOffBits=54; c`-YIz)W
CFile bf; pAENXC\,
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mH'\:oN
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =fo4x|{O
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G-2EQ.
bf.WriteHuge(lpData,size); DZJeup?Z
bf.Close(); (F_w>w.h
nCount++; Tc:sldtCk
} q;p.wEbr4U
GlobalFreePtr(lpData); rW[SU:
if(nCount==1) 'yE*|Sx
m_Number.Format("%d picture captured.",nCount); {U(Bfe^a,
else ]X*YAPv
m_Number.Format("%d pictures captured.",nCount); 9^oo-,Su_
UpdateData(FALSE); YjFWC!Qj$
} =Wj{]&`
O-Dc[t%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) gyC^K3}
{ HH7[tGF
if(pMsg -> message == WM_KEYDOWN) -eUV`&[4
{ NzAQ@E2d:
if(pMsg -> wParam == VK_ESCAPE) Hr8\QgD<4
return TRUE; /;DjJpwf0
if(pMsg -> wParam == VK_RETURN) ^,Xa IP+[
return TRUE; :#Ty^-"]1
} _~PO
return CDialog::PreTranslateMessage(pMsg); s){Q&E~X
} 7O:"~L
p[u4,
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "rVU4F)
{ T4eWbNSs
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ THJ
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SaveBmp(); A xf^hBP
return FALSE; l7ZB3'
} Ex6o=D2
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @2u#93Y
CMenu pop; D{>\-]\
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N50fL
CMenu*pMenu=pop.GetSubMenu(0); sqT^t!
pMenu->SetDefaultItem(ID_EXITICON); 6Hda]y
CPoint pt; #aa1<-&H
GetCursorPos(&pt); rxs8De
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B9}E
{)T?
if(id==ID_EXITICON) M=W
4:H,gx
DeleteIcon(); YtMlqF
else if(id==ID_EXIT) ]s_@n!
OnCancel(); au}s=ua~i
return FALSE; "tKNlHBu'
} t|.Ft<c#
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .W$
sxVXB
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xLZ bU4
AddIcon(); ZlrhC= 0
return res; s*f1x N<
} qT$)Rb&
( :iPm<
void CCaptureDlg::AddIcon() J=@xAVBc
{ |f<9miNu
NOTIFYICONDATA data; V7BsE w
data.cbSize=sizeof(NOTIFYICONDATA); B7|c`7x(
CString tip; S4)A6z$
tip.LoadString(IDS_ICONTIP); kAeNQRjR
data.hIcon=GetIcon(0); Y!M~#oqio
data.hWnd=GetSafeHwnd(); 5E`JD
strcpy(data.szTip,tip); >{b3>s~T
data.uCallbackMessage=IDM_SHELL; IYLZ
+>
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; T RDxT
data.uID=98; 3 tF:
Shell_NotifyIcon(NIM_ADD,&data); vnL?O8`c
ShowWindow(SW_HIDE); JxHv<p[
bTray=TRUE; T!(sZf
} TywK\hH
[T-*/}4$
void CCaptureDlg::DeleteIcon() ?]5Ix1
{ (V!0'9c
NOTIFYICONDATA data; J
B(<.E2
data.cbSize=sizeof(NOTIFYICONDATA); 5~Q Tg
data.hWnd=GetSafeHwnd(); 1 )'Iu`k/
data.uID=98; [EER4@_
Shell_NotifyIcon(NIM_DELETE,&data); <W2ZoqaV
ShowWindow(SW_SHOW); xdqK.Z%
SetForegroundWindow(); 7C?E z%a@
ShowWindow(SW_SHOWNORMAL); Tv1]v.
bTray=FALSE; ;5N41_hG
} F*,5\s<
mVt3WZa
void CCaptureDlg::OnChange() ncj!KyU
{ ]=|P<F
RegisterHotkey(); [8TS"ph>
} jI A#!4
AJdp6@O+
BOOL CCaptureDlg::RegisterHotkey() ]q&tQJ/Fa
{ ??j&i6sp
UpdateData(); k/@Tr
:
UCHAR mask=0; pjdo|
UCHAR key=0; d+e0;!s~O
if(m_bControl) ni<[G0#T
mask|=4; /e(W8aszi
if(m_bAlt) i&*<lff
mask|=2; 50*@.!^*
if(m_bShift) 2eHx"Ha
mask|=1; D?mDG|Z
key=Key_Table[m_Key.GetCurSel()]; 2qjyFTT
if(bRegistered){ DLXL!-)z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6<PW./rk:
bRegistered=FALSE; f7
wmw2
} 14-]esSa
cMask=mask; dWUUxKC
cKey=key; h9jc,Xu5X
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?9Ma^C;}
return bRegistered; E>"8/
} ($'V&x8T
.lr5!Stb
四、小结 ~?d>fR:X
;Yv14{T!
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。