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:
;`{H!w[D
U9 s& 一、实现方法
?e4YGOe. -@2iaQ(5a2 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:
ltSU fI k]|~>9eY] #pragma data_seg("shareddata")
$8h%a
8I HHOOK hHook =NULL; //钩子句柄
o5PO=AN UINT nHookCount =0; //挂接的程序数目
9Q.Yl&A static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
xLajso1g69 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
o:'MpKm static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)dw'BNz5hT static int KeyCount =0;
I$G['`XX/ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
gz9j&W.
#pragma data_seg()
JPHL#sKyz +3BN} 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。
J*A,o~U| |YWD8 + 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:
u
c)eil G~a ZJ, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{}przrU^c cKey,UCHAR cMask)
JXQO~zj {
Bkc4TO BOOL bAdded=FALSE;
i&fuSk EP for(int index=0;index<MAX_KEY;index++){
uH^-R_tQ if(hCallWnd[index]==0){
jB2[( hCallWnd[index]=hWnd;
<'Eme HotKey[index]=cKey;
g:@#@1rB6 HotKeyMask[index]=cMask;
oZgjQM$YP bAdded=TRUE;
^{`exCwMx KeyCount++;
q.bSIV| break;
="H`V V_ }
:3Ox~o }
|HQW0 return bAdded;
M|h3Wt~7 }
!f[_+CD //删除热键
TIDO@NwF BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
PC8Q"O {
<kqo^ BOOL bRemoved=FALSE;
hn@08t G for(int index=0;index<MAX_KEY;index++){
cV6D<,) if(hCallWnd[index]==hWnd){
ED gag if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.`eN8Dl1 hCallWnd[index]=NULL;
h[Y1?ln&h HotKey[index]=0;
K\r8g=U HotKeyMask[index]=0;
bAqA1y3= bRemoved=TRUE;
.L~AL|2_ KeyCount--;
(w3YvG. break;
2/^3WY1U }
</zEg3F\ }
C,r;VyW6BI }
<%eG:n,# return bRemoved;
M%m4i9~!? }
(L&d!$,Dv [z{1*Xc {!L~@r DLL中的钩子函数如下:
9Y9GwL]T Lqa4Vi LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#;yZ {
^yp{32 BOOL bProcessed=FALSE;
N4!O.POP if(HC_ACTION==nCode)
Ti5-6%~& {
_G@GpkSe> if((lParam&0xc0000000)==0xc0000000){// 有键松开
ZY+qA switch(wParam)
;A*]l'[- {
?:q*(EC< case VK_MENU:
XRi8Gpg MaskBits&=~ALTBIT;
Q197mN+0 break;
73;GW4, case VK_CONTROL:
_Fl9>C"u MaskBits&=~CTRLBIT;
7?_CcRe break;
)ez9"# MH' case VK_SHIFT:
W|mo5qrLS2 MaskBits&=~SHIFTBIT;
3=j"=-= break;
PJH& default: //judge the key and send message
kl:Bfs)b break;
/U9"wvg }
f]CXu3w(J for(int index=0;index<MAX_KEY;index++){
h:|qC`} if(hCallWnd[index]==NULL)
wmLs/:~ continue;
VI86KJu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^
Ze=uP {
q/,O\, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Q;rX;p^W bProcessed=TRUE;
NBGH_6DROw }
kuP(r }
z
Iu'[U }
)SGq[B6@I else if((lParam&0xc000ffff)==1){ //有键按下
}|=|s f switch(wParam)
rx|pOz,: {
[4f{w%~^ case VK_MENU:
3!]rmZ-W MaskBits|=ALTBIT;
xA*<0O\V break;
> ~O.@| case VK_CONTROL:
gcT%c|. MaskBits|=CTRLBIT;
NzvXN1_% break;
+I28|*K" case VK_SHIFT:
\9T7A& MaskBits|=SHIFTBIT;
K$=zi}J W break;
6'f;-2 default: //judge the key and send message
ckCE1e>s break;
mC#>33{ }
J|7 3.&B for(int index=0;index<MAX_KEY;index++){
`ERz\`d~Y; if(hCallWnd[index]==NULL)
&};zvo~P. continue;
+NUG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
abVmkdP_s {
eHUOU>&P] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
kAUymds;O bProcessed=TRUE;
f!X[c?Xy" }
~P-mC@C }
CrTw@AW9) }
4Z0]oIX if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
G3T]`Atf for(int index=0;index<MAX_KEY;index++){
-QNh if(hCallWnd[index]==NULL)
~k5W@`"W continue;
JxU5 fe if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
QMm%@zH SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[$UI8tV //lParam的意义可看MSDN中WM_KEYDOWN部分
t]G:L}AOl }
J{G?-+` }
@H8EWTZ }
d<Tc7vg4|U return CallNextHookEx( hHook, nCode, wParam, lParam );
{'H(g[k }
\ Cj7k^ mt.))#1 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:
Y'X%Aw;` T)_hpt. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>H,*H;6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
BiBOr}ZQ ^-'fW7[m 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:
_yR^*}xJb &K,i
f LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
R4d=S4i {
Tlr v={ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Xch~
1K {
.=;
; //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
`Pnoxm' SaveBmp();
~gt@P return FALSE;
dj%!I:Q>u }
@C aG9] …… //其它处理及默认处理
A3*!"3nU }
%;!.n{X \_f v7Fdp{ |y!A&d=xYn 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。
,/unhfs1q DtnEi4h, 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。
dAj$1Ke Znv,9- 二、编程步骤
I%Z 3Zh)]^ 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";
e+K^Aq BJ(M2|VH 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Wc
'H Etm?' 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;
g9F?z2^ bg0Wnl 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;
\l3h0R =Fl^`*n 5、 添加代码,编译运行程序。
T51
`oZ` e96k{C`j0 三、程序代码
_SkLYL!=9 FVBYo%Ap ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
}ad|g6i` #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
hpk7 Anp #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
R G`1en #if _MSC_VER > 1000
U
m+8"W #pragma once
P0b7S'a4! #endif // _MSC_VER > 1000
$ME)#( #ifndef __AFXWIN_H__
!|>"o7 #error include 'stdafx.h' before including this file for PCH
0m ? )ROaJ #endif
9cm#56 #include "resource.h" // main symbols
I2Yz#V<%ru class CHookApp : public CWinApp
Z/J y'$x {
#$y?v%^ public:
T[A69O]v CHookApp();
Ga'swP=hf // Overrides
<9
;!3xG // ClassWizard generated virtual function overrides
{l>hMxij //{{AFX_VIRTUAL(CHookApp)
jZ;
=so public:
Y6d@h? ht virtual BOOL InitInstance();
qIqM{#' ^ virtual int ExitInstance();
@=kSo
-SX //}}AFX_VIRTUAL
as=LIw}Q4 //{{AFX_MSG(CHookApp)
%~S&AE- // NOTE - the ClassWizard will add and remove member functions here.
DlNX 3 // DO NOT EDIT what you see in these blocks of generated code !
|^H5^k "Bv //}}AFX_MSG
_J [P[(ab DECLARE_MESSAGE_MAP()
xkR0 };
GuL<Z1<c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>F&47Yn BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1aABzB
^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
wlmRe`R BOOL InitHotkey();
{]|J5Dgfe BOOL UnInit();
mj@13$= #endif
5/z/>D; */DO ex"y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
{1
94!S4z #include "stdafx.h"
0qT%!ku& #include "hook.h"
?G&ikxl #include <windowsx.h>
c[Zje7 @ #ifdef _DEBUG
%u5]>]M+ #define new DEBUG_NEW
Om {'1 #undef THIS_FILE
;jTN| i' static char THIS_FILE[] = __FILE__;
7"xd1l?zz #endif
O|UC ?]6 #define MAX_KEY 100
{FTqu. #define CTRLBIT 0x04
!0E&@X:- #define ALTBIT 0x02
ws^ np #define SHIFTBIT 0x01
7J&4akT{9 #pragma data_seg("shareddata")
q"_QQ~ HHOOK hHook =NULL;
pY$Q UINT nHookCount =0;
Zj4Uak static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
GowH]MO static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
jlg(drTo static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
CVR3
A' static int KeyCount =0;
5rUdv}. static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
.3!1` L3 #pragma data_seg()
^/=KK:n~ HINSTANCE hins;
k-""_WJ~^ void VerifyWindow();
C"]^Q)aJN BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
*HB-QIl //{{AFX_MSG_MAP(CHookApp)
#LN`X8Wz' // NOTE - the ClassWizard will add and remove mapping macros here.
3DG_QVg^v // DO NOT EDIT what you see in these blocks of generated code!
.w,q0<} //}}AFX_MSG_MAP
S`?!G&[!> END_MESSAGE_MAP()
9Lfv^V0 8e"gW >f CHookApp::CHookApp()
/vb`H>P {
-s'-eQF J // TODO: add construction code here,
?P c' C // Place all significant initialization in InitInstance
pFz`}?c0 }
8sK9G`
k uA#;G/$ CHookApp theApp;
{cw /!B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
q6X1P"%. {
#yvGK:F BOOL bProcessed=FALSE;
eQvg7aO; if(HC_ACTION==nCode)
_n\GNUA {
5QO9Q]I#_\ if((lParam&0xc0000000)==0xc0000000){// Key up
~.lPEA %% switch(wParam)
xA[mm {
Q.c\/& case VK_MENU:
m9}P9? MaskBits&=~ALTBIT;
w.-!UD9/.x break;
-RK- Fu<e case VK_CONTROL:
-`TEVS?`l MaskBits&=~CTRLBIT;
m<2M4u break;
Pd]|:W< E case VK_SHIFT:
?5 [=(\/. MaskBits&=~SHIFTBIT;
%GIr&V4| break;
-;k+GrLr^ default: //judge the key and send message
"Os_vlapHo break;
xFg>SJ7] }
wo5
for(int index=0;index<MAX_KEY;index++){
SOvF[,+ if(hCallWnd[index]==NULL)
`n?DU;, continue;
R
.2wqkY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
t.\dpBq {
8|58 H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Yk Qd
bProcessed=TRUE;
^D-/`d }
}f7j8py }
|)/aGZ+ }
sds"%]rg else if((lParam&0xc000ffff)==1){ //Key down
QoH6 switch(wParam)
@49S` {
0Pi:N{x8 case VK_MENU:
&~U ] ~;@ MaskBits|=ALTBIT;
B@
KQ]4- break;
('p5:d case VK_CONTROL:
Tc3yS(aq MaskBits|=CTRLBIT;
^\,E&=/}M break;
}|5Pr(I case VK_SHIFT:
_``=cc MaskBits|=SHIFTBIT;
@>H75 break;
,UdVNA default: //judge the key and send message
4x[S\,20 break;
07=mj%yV }
t}/( b/VD for(int index=0;index<MAX_KEY;index++)
x`)&J
B {
[Cv/{f3]u{ if(hCallWnd[index]==NULL)
I?G: p+ continue;
r1RM
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q#[9|A9 {
W-lN>]5}m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fZA4q0 bProcessed=TRUE;
<dhM\^[ }
c6]D-YNFG }
nwCrZW }
&W6^sj*k5U if(!bProcessed){
v^+Sh|z/ for(int index=0;index<MAX_KEY;index++){
"AGLVp.zT if(hCallWnd[index]==NULL)
WX6&oy> continue;
]~hk6kS8Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!0mI;~q| F SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U}j0D2 }
-_eLf#3 }
$5Ff1{ }
WaR`Kp+> return CallNextHookEx( hHook, nCode, wParam, lParam );
%FI E\9 }
\6*I'|5d hTi$.y!k BOOL InitHotkey()
#|PS&}6wU {
pBA7,z"`mP if(hHook!=NULL){
~Vjl7G\7i nHookCount++;
001FmiV return TRUE;
5(HG| }
]f9Cx\d:k else
`$aZ0+ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
)U{Qj5W+F if(hHook!=NULL)
_~ iw[*#u nHookCount++;
K~uq,~ return (hHook!=NULL);
-5QZJF2~ }
A
'];` BOOL UnInit()
)~ h} {
o`N9!M if(nHookCount>1){
:1KpGj*F nHookCount--;
(,Df^4%7 return TRUE;
<
F+l }
HEc+;O1< BOOL unhooked = UnhookWindowsHookEx(hHook);
D]Xsvv
# if(unhooked==TRUE){
)
M BQuiL nHookCount=0;
]1pIj
i[ hHook=NULL;
3fQuoQuD"} }
Dy8r 9 return unhooked;
6MdiY1Lr!K }
agW@{c UH/\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,f;}|d:r {
2Dj%,gaR BOOL bAdded=FALSE;
~|xA4u5LG for(int index=0;index<MAX_KEY;index++){
>%8KK|V{ if(hCallWnd[index]==0){
)+t0:GwP`: hCallWnd[index]=hWnd;
H-f X(9 HotKey[index]=cKey;
_Qi&J.U> HotKeyMask[index]=cMask;
*>qp:;,DKP bAdded=TRUE;
H@8sNV/u KeyCount++;
gn".u!9j break;
L"Olwwmk }
8k1Dj1@0z }
mk+B9?;cF- return bAdded;
mZ"4&U }
`t'W2X {
W{]L: BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o.\F.C$ {
N `F~n%N BOOL bRemoved=FALSE;
7 X'u6$i for(int index=0;index<MAX_KEY;index++){
XaPV94 if(hCallWnd[index]==hWnd){
k%QpegN if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l u%}h7ng hCallWnd[index]=NULL;
9kS^Abtk HotKey[index]=0;
CDR@
`1- HotKeyMask[index]=0;
h/hmlnOQl bRemoved=TRUE;
[>5-$Y OT KeyCount--;
d;9FB[MmOJ break;
ls:w8&`* }
~d*(=G }
p/@smke }
o:P}Wg/NK return bRemoved;
.rqhi }
@>>~CZ`l +jnJ|h({ void VerifyWindow()
JKmIvZ)8 {
r{I%
\R!@ for(int i=0;i<MAX_KEY;i++){
0eu$ W if(hCallWnd
!=NULL){ 3r."j2$Hs0
if(!IsWindow(hCallWnd)){ H{?vbqQ
hCallWnd=NULL; g0Gf6o>2
HotKey=0; YRN06*hS
HotKeyMask=0; v+#}rUTF
KeyCount--; 7f!YoW;1
} ^qQZT]
} |My4SoOF
} \k!{uRy'
} !SdSE^lz`
x$Oq0d{T
BOOL CHookApp::InitInstance() n!xt5=xP{
{ /Uy"M:|V1
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9}F*P669f
hins=AfxGetInstanceHandle(); Vi]W |bP
InitHotkey(); kbMWGB%;
return CWinApp::InitInstance(); OO*zhGD;[
} d,Yw5$i
fnX`Q[b4\A
int CHookApp::ExitInstance() 6'G6<8>-
{ Jx](G>F4f1
VerifyWindow(); yS(fILV
UnInit(); v8[I8{41
return CWinApp::ExitInstance(); usK*s$ns
}
sAS:-wp
z Q`jP$2
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file sjwo/+2
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) > $7v
;Q
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f"SD/]q-
#if _MSC_VER > 1000 m\r@@!
#pragma once ![_*(8v}S
#endif // _MSC_VER > 1000 :^WKT
BB*f4z$Y%
class CCaptureDlg : public CDialog ~8P!XAU56%
{ z(Pe,zES
// Construction .e=:RkI,
public: ADP%QTdqFJ
BOOL bTray; L`p4->C9A
BOOL bRegistered; D rHVG
BOOL RegisterHotkey(); *%fi/bimG
UCHAR cKey; v>Yb/{A
UCHAR cMask; [~#WG/!:
void DeleteIcon(); _R13f@NWB:
void AddIcon(); fS [,vPl
UINT nCount; kG@@ot" n
void SaveBmp(); *|>d
CCaptureDlg(CWnd* pParent = NULL); // standard constructor vV6I0
// Dialog Data jW3!6*93
//{{AFX_DATA(CCaptureDlg) Xr$J9*Jk-
enum { IDD = IDD_CAPTURE_DIALOG }; >qjq=Ege
CComboBox m_Key; J^}V|#
BOOL m_bControl; +)<wDDC_
BOOL m_bAlt; wKYZa# u
BOOL m_bShift; KB`!Sj\
CString m_Path; q6SXWT'Sa
CString m_Number; MVTMwwO \[
//}}AFX_DATA I E&!YP(U(
// ClassWizard generated virtual function overrides Vp*KfS]
//{{AFX_VIRTUAL(CCaptureDlg) F6OpN"UM'
public: m)v"3ib
virtual BOOL PreTranslateMessage(MSG* pMsg); Nj
xoTLI
protected: bE#,=OI$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )ufg9"\
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); luuX2Mx>o
//}}AFX_VIRTUAL "2P&X
// Implementation WEQ1 Seq
protected: m~P CB_ifW
HICON m_hIcon; V4P;
5[
// Generated message map functions Gh}LlX!w
//{{AFX_MSG(CCaptureDlg) Y*>#T
virtual BOOL OnInitDialog(); 7;sj%U^'l
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bRJMYs
afx_msg void OnPaint();
1 +qw$T
afx_msg HCURSOR OnQueryDragIcon(); t2"O
virtual void OnCancel(); }Q?c"H!/
afx_msg void OnAbout(); f3&[#%
afx_msg void OnBrowse(); iZNts%Y]
afx_msg void OnChange(); D 38$`j
//}}AFX_MSG - UdEeZz.
DECLARE_MESSAGE_MAP() `U)hjQ~pP
}; "B4;,+4kR
#endif 2`>T oWN!
9{}1r2xW
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wEE\+3b)
#include "stdafx.h" *:t|qgJI#+
#include "Capture.h" p|jV{P
#include "CaptureDlg.h" Wi2WRJdyu
#include <windowsx.h> u7[ykyV
#pragma comment(lib,"hook.lib") YN2sdG
#ifdef _DEBUG 3'qJ/*]9
#define new DEBUG_NEW -/cZeQDPb
#undef THIS_FILE ang~<
static char THIS_FILE[] = __FILE__; Xr2ou5zAn
#endif .DR<Te
#define IDM_SHELL WM_USER+1 %K`% *D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y/ee~^YxK'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WObvbaK
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Vf'd*-_!Q<
class CAboutDlg : public CDialog Jd(,/q
{ |8=nL$u
public: ,:`4%
CAboutDlg(); a1.Ptf eW|
// Dialog Data _$f9]bab
//{{AFX_DATA(CAboutDlg) ]*FVz$>XM
enum { IDD = IDD_ABOUTBOX }; U,gti,IX^
//}}AFX_DATA Ph}|dGb
// ClassWizard generated virtual function overrides %D8ZO0J7H
//{{AFX_VIRTUAL(CAboutDlg) 7L@K _ZJ
protected: W4e5Rb4~f"
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ryCI>vJz
//}}AFX_VIRTUAL Y$Y_fjd_
// Implementation &)vC;$vD`
protected: jhu&&==\f
//{{AFX_MSG(CAboutDlg) CkD#/
//}}AFX_MSG GXjfQ~<]
DECLARE_MESSAGE_MAP() C;`XlQG `
}; {R61cD,n
?jt}*q>X]
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &A)B~"[~
{ %Gj8F4{
//{{AFX_DATA_INIT(CAboutDlg) '|*?*6q
//}}AFX_DATA_INIT Yd= a}T
} 9^Whg~{
>teOm?@U
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )m{Ye0!RD
{ AUNQA
CDialog::DoDataExchange(pDX); $m+sNEAa
//{{AFX_DATA_MAP(CAboutDlg) UIAj]
//}}AFX_DATA_MAP x-<)\L&
} gV`=jAE_
&jczO-R^
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +|@rD/I6
//{{AFX_MSG_MAP(CAboutDlg) l)w Hl%p
// No message handlers J.dLPKU;-
//}}AFX_MSG_MAP t|!j2<e
END_MESSAGE_MAP() E)7F\ w
S:q3QgU=X
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .G(llA}
: CDialog(CCaptureDlg::IDD, pParent) f0<%&2ym
{ ]oV{t<0a
//{{AFX_DATA_INIT(CCaptureDlg) QgD g}\P
m_bControl = FALSE; nJ"YIT1K]p
m_bAlt = FALSE; ]%Nlv(
m_bShift = FALSE; H_Kj7(=&>
m_Path = _T("c:\\"); ?wF'<kEH
m_Number = _T("0 picture captured."); |),'9
nCount=0; Qb; d:@9
bRegistered=FALSE; M=*bh5t%]
bTray=FALSE; x^y" <
//}}AFX_DATA_INIT qYf |Gv
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "/6:6`J
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =w5O&(
} U_$qi
ZA9sTc[
g
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )d-.M
{ ^1x*lLf
CDialog::DoDataExchange(pDX);
"t$k
//{{AFX_DATA_MAP(CCaptureDlg) f\1A!Yp
DDX_Control(pDX, IDC_KEY, m_Key); e)IpPTj#
DDX_Check(pDX, IDC_CONTROL, m_bControl); ym/fFm6h
DDX_Check(pDX, IDC_ALT, m_bAlt); Q33"u/-v
DDX_Check(pDX, IDC_SHIFT, m_bShift); lz0TK)kuC
DDX_Text(pDX, IDC_PATH, m_Path); TO*BH^5R
DDX_Text(pDX, IDC_NUMBER, m_Number); ^o@,3__7Q
//}}AFX_DATA_MAP Y<b-9ai<w
} l?DJJ|> O
,\d6VBP&
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) q@~L&{
//{{AFX_MSG_MAP(CCaptureDlg) kctzNGF|
ON_WM_SYSCOMMAND() ^(f4*m6`
ON_WM_PAINT() L0]_hxE?
ON_WM_QUERYDRAGICON() @a>2c$%
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]cC[-F[
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !W'Ui
9uX
ON_BN_CLICKED(ID_CHANGE, OnChange) Hiv!BV|
//}}AFX_MSG_MAP w pt='(
END_MESSAGE_MAP() 16EVl~LN
(j"(
BOOL CCaptureDlg::OnInitDialog() Rek
-`ki5F
{ "ZHtR/;
CDialog::OnInitDialog(); q
)lnS )
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); FvuGup`w
ASSERT(IDM_ABOUTBOX < 0xF000); bo=ZM9
CMenu* pSysMenu = GetSystemMenu(FALSE); !.<T"8BUpv
if (pSysMenu != NULL) H,<7G;FPT
{ g3sUl&K
CString strAboutMenu; b7\ cxgRq
strAboutMenu.LoadString(IDS_ABOUTBOX); \zkw2*t
if (!strAboutMenu.IsEmpty()) $hVYTy~}
{ ]PP:oriWl
pSysMenu->AppendMenu(MF_SEPARATOR); W Qzj[
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )Vk6;__
} ";w}3+R
} #W2[
SetIcon(m_hIcon, TRUE); // Set big icon Y'3}G<'%
SetIcon(m_hIcon, FALSE); // Set small icon asgF1?r
m_Key.SetCurSel(0); FNQX7O52
RegisterHotkey(); 's!-80sd
CMenu* pMenu=GetSystemMenu(FALSE); ExXM:1 e26
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _uu<4c
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); cj|*_}
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); u%d K ig
return TRUE; // return TRUE unless you set the focus to a control $7Mtt.d6
} >71&]/Rv
&&<9p;E
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O^I[
(8Y8
{ }2r+%V&4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) /<3<.
~
{ geefnb
CAboutDlg dlgAbout; a>B[5I5
dlgAbout.DoModal(); DrvtH+e
} m:O(+Fl
else y8bM<e2
U
{ OAZ#|U
CDialog::OnSysCommand(nID, lParam); '69ZdP/xX
} tNmy&
nsA
} kF V7l
LDy<k=;o
void CCaptureDlg::OnPaint() @TA9V@?)
{ +|%Sx
if (IsIconic()) kDYN>``biP
{ %im#ww L%
CPaintDC dc(this); // device context for painting ,rwuy[Q8
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w[Ep*-yeI
// Center icon in client rectangle npu6E;'l*
int cxIcon = GetSystemMetrics(SM_CXICON); V5GkP1L
int cyIcon = GetSystemMetrics(SM_CYICON); z&$/EP-
CRect rect; agOk*wH5
GetClientRect(&rect); i!dv0|_
int x = (rect.Width() - cxIcon + 1) / 2; \H5Jk$*
int y = (rect.Height() - cyIcon + 1) / 2; *sfD#Bi]
// Draw the icon N<_Ko+VF
dc.DrawIcon(x, y, m_hIcon); `
e {BId
} B7-RU<n
else 9f}XRz
{ )06iV
CDialog::OnPaint(); 4*UP.r@
} :PnSQjV:
} 8C.!V =@\
6j8<Q 2
HCURSOR CCaptureDlg::OnQueryDragIcon() jUjr6b"
{ !m{2WW-
return (HCURSOR) m_hIcon; 9-bG<`v\E
} H.O(*Q=
[H"#7t.V-~
void CCaptureDlg::OnCancel() )Z@-DA*Q-
{ g>7Y~_}
if(bTray) {lz G*4?
DeleteIcon(); 'CS.p!Z\
CDialog::OnCancel(); HrqF![_
} ]Bb7(JX
mKg@W;0ML
void CCaptureDlg::OnAbout() ke.7Zp2.R
{ GZ0aOpUWVq
CAboutDlg dlg; WY)^1Gb$ux
dlg.DoModal();
H=zN[MU
} !Zw f
397
]~a_d)
void CCaptureDlg::OnBrowse() +~|AT+|iI
{ H^CilwD158
CString str; cvAtw Q'
BROWSEINFO bi; voRfjsS~
char name[MAX_PATH]; ":d*dl
ZeroMemory(&bi,sizeof(BROWSEINFO)); jgvh[@uB?
bi.hwndOwner=GetSafeHwnd(); :?r*p>0$
bi.pszDisplayName=name; (@ea|Fd#4
bi.lpszTitle="Select folder"; g^o_\hp
bi.ulFlags=BIF_RETURNONLYFSDIRS; `.k5v7!o
LPITEMIDLIST idl=SHBrowseForFolder(&bi); o|287S|$
if(idl==NULL) C?QfF{!7
return; t,vTAq.))
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <~%t$:
str.ReleaseBuffer(); zw:/!MS
m_Path=str; \kwe51MQ
if(str.GetAt(str.GetLength()-1)!='\\') +|nsu4t,<
m_Path+="\\"; +X!+'>
UpdateData(FALSE); .9\Cy4_qSd
} Jc~E"x
;x>;jS.t
void CCaptureDlg::SaveBmp() ~!
Lw1]&
{ .wFU:y4r
CDC dc; z(d4)z 8'6
dc.CreateDC("DISPLAY",NULL,NULL,NULL); lfMH1llx
CBitmap bm; .g-3e"@
int Width=GetSystemMetrics(SM_CXSCREEN); {u]CHN`%Z
int Height=GetSystemMetrics(SM_CYSCREEN); TSyzdnMvz
bm.CreateCompatibleBitmap(&dc,Width,Height); o#d$[oa
CDC tdc; 8)Tj
H'
tdc.CreateCompatibleDC(&dc); 1e$[p[
CBitmap*pOld=tdc.SelectObject(&bm); L+Nsi~YVq
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); hrlCKL&
tdc.SelectObject(pOld); O~Uw&Bq
BITMAP btm; 1XnBK$`
bm.GetBitmap(&btm); nJ# XVlHc
DWORD size=btm.bmWidthBytes*btm.bmHeight; >7FSH"8[,
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E2yz=7sv5
BITMAPINFOHEADER bih; G(i\'#5+
bih.biBitCount=btm.bmBitsPixel; l Z~+u
bih.biClrImportant=0; t61'LCEis
bih.biClrUsed=0; @c"yAy^t
bih.biCompression=0; h2}am:%mC
bih.biHeight=btm.bmHeight; *7vue"I*Z
bih.biPlanes=1; ^X;JT=r
bih.biSize=sizeof(BITMAPINFOHEADER); U3q5^{0d/
bih.biSizeImage=size; byj[u!{
bih.biWidth=btm.bmWidth; z`9l<Q/
bih.biXPelsPerMeter=0; {dZ8;Fy4
bih.biYPelsPerMeter=0; 9XN~Ln@}
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2<.Vv\
=
static int filecount=0; 2?*1~ 5~I
CString name; `t\z
name.Format("pict%04d.bmp",filecount++); 2wOy}:
name=m_Path+name; I;iR(Hf)?q
BITMAPFILEHEADER bfh; lWl-@*'
bfh.bfReserved1=bfh.bfReserved2=0; w})NmaT;YF
bfh.bfType=((WORD)('M'<< 8)|'B'); `hF;$
bfh.bfSize=54+size; JE%i-UVH+;
bfh.bfOffBits=54; l_sg)Vr/b
CFile bf; v =bv@c
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZmO'IT=Ye
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }Ch[|D=Wd6
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3&'R1~Vh
bf.WriteHuge(lpData,size); hd=j56P5P
bf.Close(); = P8~n2V
nCount++; IgiqFV{
} w\v&3T
GlobalFreePtr(lpData); @{de$ODu
if(nCount==1) lvig>0:M
m_Number.Format("%d picture captured.",nCount); G\IocZ3Gz
else EreAn
m_Number.Format("%d pictures captured.",nCount); iDvpXn
UpdateData(FALSE);
bn|DRy
} A@{ !:_55
][N) 2_^M
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /op/g]O}
{ 9e76pP(
if(pMsg -> message == WM_KEYDOWN) $@4e(Zrmo
{ l2M/,@G
if(pMsg -> wParam == VK_ESCAPE) !Ba3`B5l
return TRUE; ].c@Gm_(
if(pMsg -> wParam == VK_RETURN) ~)!VV)
return TRUE; o9^$hDs,si
} I]UA0[8X
return CDialog::PreTranslateMessage(pMsg); mc56L[
} Suj}MEiv
u;{T2T
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F_~6n]Sr
{ @%keTTZ
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t)`+d=P
SaveBmp(); |3W3+Rn!
return FALSE; FRD<0o /`
} fzOMX
z
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *@=fq|6l 2
CMenu pop; <X9T-b"$h
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dR%q1Y&`
CMenu*pMenu=pop.GetSubMenu(0); o|BFvhg
pMenu->SetDefaultItem(ID_EXITICON); ="=#5C
CPoint pt; k@lXXII ?
GetCursorPos(&pt); f>b!-|
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5]Z] j[8Y
if(id==ID_EXITICON) 7a27^b
DeleteIcon(); k.h^ $f
else if(id==ID_EXIT) olslzXn7o
OnCancel(); 8:BQHYeJK
return FALSE; oO}>i0ax*
} X$ejy/+.
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3 pHn_R
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) U
&f#V=Rg
AddIcon(); CJtr0M<U+
return res; \_)02ZT:
} nN!vgn
j
la1D2 lM
void CCaptureDlg::AddIcon() MH2OqiCI
{ <m:4g
,6
NOTIFYICONDATA data; >J?jr&i
data.cbSize=sizeof(NOTIFYICONDATA); sL;z"N@PK
CString tip; SIJ# ?0,
tip.LoadString(IDS_ICONTIP); V&$ J;
data.hIcon=GetIcon(0); t
PAt?
data.hWnd=GetSafeHwnd(); Fj36K6!#?
strcpy(data.szTip,tip); 'XG:1Bpm
data.uCallbackMessage=IDM_SHELL; gA|!$EAM
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~&vA_/M
data.uID=98; `mQP{od?"?
Shell_NotifyIcon(NIM_ADD,&data); 1'gKZB)TG7
ShowWindow(SW_HIDE); /,-h%gj
bTray=TRUE; m.|qVN
} #.RG1-L
QGu7D #%|
void CCaptureDlg::DeleteIcon() n^3NA|A
{ fB@K'JQG
NOTIFYICONDATA data; nA|gQibA
data.cbSize=sizeof(NOTIFYICONDATA); kwDjK"
data.hWnd=GetSafeHwnd(); -DbH6u3
data.uID=98; GC,vQ\
Shell_NotifyIcon(NIM_DELETE,&data); ?T$*5d
ShowWindow(SW_SHOW); :H~UyrN
SetForegroundWindow(); 5n-9#J$
ShowWindow(SW_SHOWNORMAL); 1
yxZ
bTray=FALSE; X=-gAutfE=
} ze-TBh/
UA1]o5K
void CCaptureDlg::OnChange() ^/ULh,w!fP
{
)@sJTAK
RegisterHotkey(); " {,\]l&o
} A?^A*e
:%+^}
BOOL CCaptureDlg::RegisterHotkey() K*J4&5?/
{ dVjcK/T<
UpdateData(); 8N</Yi|n
UCHAR mask=0; a)YJ4\Qg[
UCHAR key=0; !4DGP28
if(m_bControl) }D&"z8mP
mask|=4; p=#'B*'w
if(m_bAlt) j=!(F`/
mask|=2; 5e~ j
if(m_bShift) Ac*B[ywA3
mask|=1; dlU
JYI
key=Key_Table[m_Key.GetCurSel()]; ;H D 4~3
if(bRegistered){ @+QYWh'
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9y
d-&yDG
bRegistered=FALSE;
<Hq6]\<
} .If"'hMY
cMask=mask; )Gu0i7iN
cKey=key; 4O5n6~24
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \#IJ=+z
return bRegistered; d&$.jk8 2
} Q6e'0EIKC
(25^r
四、小结 -&f]Xu
6&/ Ew4 e
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。