关于BITBLT用法?截图老是黑的?
代码如下:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpclassname As String, ByVal lpWindowName As String) As Long'定义全局变量
Public S1_left
Public S1_right
Public S1_up
Public S1_downS1_left = 380
S1_right = 650
S1_up = 40
S1_down = 80Private Sub Command2_Click()
'上面S1 图象复制到pic2
hwnd = FindWindow(vbNullString, "资源管理器")
Mybit = BitBlt(Picture2.hDC, 0, 0, S1_right - S1_left, S1_down - S1_up, hwnd, S1_left, S1_down, SRCCOPY)End Sub出来老是黑的,求解!'获取窗口句柄代码 经过测试没问题!
代码如下:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpclassname As String, ByVal lpWindowName As String) As Long'定义全局变量
Public S1_left
Public S1_right
Public S1_up
Public S1_downS1_left = 380
S1_right = 650
S1_up = 40
S1_down = 80Private Sub Command2_Click()
'上面S1 图象复制到pic2
hwnd = FindWindow(vbNullString, "资源管理器")
Mybit = BitBlt(Picture2.hDC, 0, 0, S1_right - S1_left, S1_down - S1_up, hwnd, S1_left, S1_down, SRCCOPY)End Sub出来老是黑的,求解!'获取窗口句柄代码 经过测试没问题!
解决方案 »
- vb串口通信温度检测模块。求解答
- TreeView控件有没有运行时初始化的方法?
- 怎样使用access的查询功能输出要统计的字段值?
- 部件中没有"Microsoft Data Bound Grid Control 5.0", 为什么?
- 急,函数中数组作为函数参数,我该怎么处理,详细请进来看看!
- 在那里可以找到用VB开发的代理服务器软件的源代码
- msn ,请教了???
- vb 如何终止外部程序中的某个线程(就是实现ProcessExplorer的功能)
- 我的VB水平很一般 现在就要找工作了 现在很多公司都VB+SQL SREVR 但我只会VB+ACCESS 开发小型的数据库 我现在应该怎么办?
- 需要QBASIC
- 如何提高图片显示的速度
- VB6远程调用ACTIVEX失败
Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hdc As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Sub Form_Load()
'将 Picture1 之长宽设定成和屏幕一样大小
Picture1.Width = Screen.Width
Picture1.Height = Screen.Height
End SubPrivate Sub Form_Unload(Cancel As Integer)
Call ReleaseDC(HwndVal, HdcVal)
End
End SubPrivate Sub Command1_Click()
Dim HwndVal&, HdcVal&
Picture1.AutoRedraw = True
HwndVal = GetDesktopWindow
HdcVal = GetDC(HwndVal)
Call BitBlt(Picture1.hdc, 0, 0, Screen.Width \ 15, Screen.Height \ 15, HdcVal, 0, 0, vbSrcCopy)
Picture1.Picture = Picture1.Image
Call ReleaseDC(HwndVal, HdcVal)
End Sub