DALSA相机开发--修改参数

DALSA gige相机有两种方式可以获取到相机相关参数，一个是读取相机里面的xml文件；另外一个是读取相对应的寄存器的值。

对于修改寄存器的值，有两个相应的函数：

1）GevSetFeatureValue

函数原型为：

GEV_STATUS GevSetFeatureValue(GEV_CAMEAR_HANDLE handle, const char *feature_name, int value_size, void *value);

2）GevSetFeatureValueAsString

函数原型为：

GEV_STATUS GevSetFeatureValueAsString(GEV_CAMERA_HANDLE handle, const char *feature_name,  char *value_string);

两者之间端区别在于，GevSetFeatureValue 可以配置任意类型（支持的类型）的值，并且需要手动填写类型。而GevSetFeatureValueAsString 是固定为string类型，只需要填写相对应端值即可。

还有一个更重要的区别是，GevSetFeatureValue能够配置的项在文件 cameraregdata.c 中有对应，许多项配置不了，受制于结构体

typedef struct

{

    char                featureName[FEATURE_NAME_MAX_SIZE]; // String name of feature for this register.

    UINT32              address;         // Address for accessing feature in camera (NOREF_ADDR if not in camera).

    RegAccess           accessMode;     // RO, WO, RW access allowed.

    BOOL32              available;      // True if feature is available (in camera or not) - False is not available.

    RegType             type;           // String, Float, Integer, Enum, Bit

    UINT32              regSize;        // Size of storage for register (or register set / area).

    UINT32              regStride;    // Increment between register items accessed via selector

    UINT32              minSelector;    // Minimum value for selector (corresponds to base address).

    UINT32              maxSelector;    // Maximum value for selector.

    GENIREG_VALUE       value;    // Current value (storage for features not backed by a register).

    GENIREG_VALUE       minValue;    // Minimum allowable value.

    GENIREG_VALUE       maxValue;    // Maximum allowable value.

    UINT32              readMask;       // AND Mask for read (integers only)

    UINT32              writeMask;      // AND Mask for write (integers only)

    PGENICAM_FEATURE    feature;         // Pointer to feature in feature table (future).

    char                selectorName[FEATURE_NAME_MAX_SIZE]; // String name of selector for feature.

    char                indexName[FEATURE_NAME_MAX_SIZE]; // String name of index (second selector)for feature.

} GEV_REGISTER, *PGEV_REGISTER;

中accessMode 和 available 等属性。

而 GevSetFeatureValueAsString 却能够配置 featureName存在的项，能力远远大于 GevSetFeatureValue 。